Consulta: subjectFacets:"Nitrogen"
Registros recuperados: 425
Data/hora: 03/06/2024 10:17:12

EVALUATION OF Azospirillum brasilense DOSE RESPONSE ON FRESH AND DRY MATTER OF SHOOT AND ROOT OF CORN PLANTS
Provedor de dados: 196
Autores: do Amaral Júnior, Wellington Elias; Rodrigues Esteves, Flávia; Pereira de Menezes Filho, Antonio Carlos; Abadia Ventura, Matheus Vinicius.
Zea mays (corn) is one of the leading crops focused on producing food and feed for humans and animals. The use of diazotrophic bacteria such as Azospirillum brasilense demonstrates a positive effect on nitrogen availability, a primordial element for the development of this plant. This study aimed to evaluate the gain of the fresh and dry matter of shoots and roots in a corn cultivar inoculated with A. brasilense at different doses. The experiment was carried out in pots containing soil. The corn seeds, cultivar Agroceres® 5055, were inoculated with A. brasilense at doses between 100 to 250 mL 20 kg-1. It was observed that inoculation with A. brasilense positively affected fresh and dry matter gain of both shoot and roots between doses of 100-200 mL 20 kg-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Corn; Nitrogen fixing bacteria; Azospirillum; Nitrogênio; Milho; Bactéria fixadora de Nitrogênio; Azospirillum.
Ano: 2022
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6993

Inoculación con Paenibacillus polymyxa y fertilización nitrogenada en maíz bajo condiciones de temporal.
Provedor de dados: 32
Autores: Benítez Noyola, Mariela.
En México el maíz es el cultivo más importante por la diversidad de usos que presenta, es la base de la alimentación humana, animal y materia prima para la industria; sin embargo, es un cultivo que demanda niveles altos de nitrógeno que no siempre se cubren por el costo que implica el uso de fertilizante. Una alternativa de bajo costo es el uso de inoculantes a base de bacterias promotoras del crecimiento vegetal (BPCV) que pueden combinarse con la fertilización. El objetivo de esta investigación fue evaluar la respuesta de maíz a la inoculación con la cepa de Paenibacillus polymyxa BSP1.1 en combinación con diferentes niveles de fertilización nitrogenada en condiciones de temporal. El experimento se estableció en un diseño experimental de parcelas...
Palavras-chave: Nitrógeno; Fertilización; Inoculación; Bacterias promotoras del crecimiento vegetal; Maíz; Rendimiento; Nitrogen; Fertilization; Inoculation; Plant growth promoting rhizobacteria; Corn; Yield; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1865

Producción de garbanzo (Cicer arietinum L.) en función del manejo y ambiente.
Provedor de dados: 32
Autores: Apáez Barrios, Maricela.
El garbanzo es una de las leguminosas más consumidas en México por sus características nutrimentales y nutracéuticas, lo que lo hace un cultivo se suma importancia. El objetivo del estudio fue determinar la respuesta a la distancia entre hileras de siembra y fertilización nitrogenada sobre índices de análisis de crecimiento, la biomasa, rendimiento y calidad de rendimiento. Durante el ciclo de producción otoño invierno de 2011, se realizó un estudio con garbanzo (Cicer arietinum L.) en terreno de productores cooperantes bajo condiciones de humedad residual en Huitzuco Gro., Méx, de clima cálido. Se evaluó la distancia entre hilera a 40 cm y 80 cm (D40 y D80, respectivamente) y fertilización nitrogenada (FN): 0, 50 y 100 kg N ha-1 (N0, N50 y N100,...
Palavras-chave: Biomasa total; Distancia entre hilera; Nitrógeno; Rendimiento de grano; Rentabilidad económica; Total biomass; Distance between row; Nitrogen; Grain yield; Profitability; Botánica; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2010

Transporte de nitrógeno en Physalis peruviana L. como respuesta a la aplicación de nitrato y amonio en la solución nutritiva.
Provedor de dados: 32
Autores: Méndez Merino, Eduardo.
El experimento se inició en julio de 2012 en condiciones de hidroponía, en un invernadero del área de nutrición vegetal del Colegio de Postgraduados. Se establecieron plantas sometidas a poda de Physalis peruviana L. bajo el diseño de bloques completamente al azar y plantas de semilla en el diseño completamente al azar bajo diferentes relaciones NO3-/NH4+ (100/0, 75/25 y 50/50) con la finalidad de evaluar la concentración de N-total, N-NO3- y N-reducido en el tejido vegetal en 4 y 3 muestreos, respectivamente, para su uso como herramienta de diagnóstico nutrimental. Los muestreos en plantas sometidas a poda fueron a 39, 64, 87 y 108 días después de aplicado el tratamiento (ddt) y en las plantas de semilla a 64, 87 y 108 ddt.  Adicionalmente se midió el...
Palavras-chave: Nitrógeno; Dinámica Nutrimental; Diagnostico Nutrimental; Nitrogen; Nutritional Dynamics; Nutritional Diagnosis; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2149

Reflectancia e índices espectrales en pimiento para el diagnóstico nutrimental de nitrógeno
Provedor de dados: 32
Autores: Cruz Durán, Jairo Aarón, de la.
El conocimiento de las firmas espectrales en la valoración de parámetros fisiológicos y nutrimentales, serán de gran utilidad en una agricultura mayormente competitiva. El objetivo de esta investigación consistió en obtener firmas espectrales en hojas de pimiento mediante un espectrómetro e imágenes digitales (escáner) durante el desarrollo del cultivo, para el diagnóstico de estrés por carencias y excesos de nitrógeno. Se determinó la reflectancia de las hojas de pimiento en tres bandas del espectro visible (RGB) y dos del infrarrojo cercano (NR), se obtuvieron imágenes de plantas para la determinación del índice de área foliar (IAF) y se colectaron muestras foliares para el análisis de nitrógeno, el cual se determinó por el método de microkjeldahl. La...
Tipo: Tesis
Palavras-chave: Sensores  remotos; Reflectancia; NDVI; Nitrógeno; Espectrómetro; Escáner; Cámara digital; Firmas espectrales; Nivel crítico de reflectancia; Remote sensors; Reflectance; Nitrogen; NDVI; Nitrogen; Spectrometer; Scanner; Digital camera; Spectral signatures; Critical level of reflectance.
Ano: 2008
URL: http://hdl.handle.net/10521/1659

Crecimiento y rendimiento de haba (Vicia faba L.) en ambientes contrastantes.
Provedor de dados: 32
Autores: Pichardo Riego, Juan Carlos.
En México el cultivo de haba es de gran importancia social y económica principalmente en la región de los “Valles altos”, que aportan cerca del 98% a la producción nacional. Sin embargo debido a los bajos rendimientos de esta leguminosa se requiere un manejo del cultivo más apropiado en función de la diversidad de ambientes en que se desarrolla, incluyendo la búsqueda de cultivares de máximo rendimiento de grano seco para cada localidad. El objetivo del estudio fue determinar el comportamiento de distintos cultivares de haba en diferentes ambientes e identificar el más productivo de acuerdo a la región de estudio y a éste, aplicarle la mejor combinación de fertilización nitrogenada, fosfatada y densidad de población (DP). El estudio se realizó bajo...
Palavras-chave: Cultivar; Nitrógeno; Fósforo; Densidad de población; Rendimiento; Estabilidad de rendimiento; Máxima eficiencia biológica; Máxima eficiencia económica; Tratamiento óptimo económico; Cultivar; Nitrogen; Phosphorus; Population density; Yield; Yield stability; Maximum biological efficiency; Maximum economical efficiency; Optimum economic treatment; Doctorado; Botánica.
Ano: 2010
URL: http://hdl.handle.net/10521/157

Crecimiento y rendimiento de haba (Vicia faba L.) en ambientes contrastantes.
Provedor de dados: 32
Autores: Pichardo Riego, Juan Carlos.
En México el cultivo de haba es de gran importancia social y económica principalmente en la región de los “Valles altos”, que aportan cerca del 98% a la producción nacional. Sin embargo debido a los bajos rendimientos de esta leguminosa se requiere un manejo del cultivo más apropiado en función de la diversidad de ambientes en que se desarrolla, incluyendo la búsqueda de cultivares de máximo rendimiento de grano seco para cada localidad. El objetivo del estudio fue determinar el comportamiento de distintos cultivares de haba en diferentes ambientes e identificar el más productivo de acuerdo a la región de estudio y a éste, aplicarle la mejor combinación de fertilización nitrogenada, fosfatada y densidad de población (DP). El estudio se realizó bajo...
Palavras-chave: Cultivar; Nitrógeno; Fósforo; Densidad de población; Rendimiento; Estabilidad de rendimiento; Máxima eficiencia biológica; Máxima eficiencia económica; Tratamiento óptimo económico; Cultivar; Nitrogen; Phosphorus; Population density; Yield; Yield stability; Maximum biological efficiency; Maximum economical efficiency; Optimum economic treatment; Doctorado; Botánica.
Ano: 2010
URL: http://hdl.handle.net/10521/157

Nutrición nitrogenada y potásica en dos especies de alcatraz (Zantedeschia albomaculata y Z. elliotiana).
Provedor de dados: 32
Autores: Torres Flores, Nadia Issaí.
La fertilización es un factor determinante en el crecimiento y producción del alcatraz, y la aplicación de N y K es necesaria en cantidades suficientes, ya que son los elementos que mayor demanda el cultivo y cuya deficiencia puede afectar drásticamente el desarrollo, producción y calidad de esta especie. La presente investigación se realizó con el objetivo de evaluar los efectos de dosis de fertilización nitrogenada en etapa vegetativa y dosis de fertilización potásica en etapa reproductiva, en parámetros de crecimiento, fenológicos, de calidad y nutrimentales de dos especies de alcatraz (Zantedeschia albomaculata) cv. Captain Murano y Zantedeschia elliotiana cv. Solar Flare). El experimento se realizó en el Colegio de Postgraduados, Montecillo, Texcoco,...
Palavras-chave: Zantedeschia albomaculata; Z. elliotiana; Nitrógeno; Potasio; Etapa vegetativa; Etapa reproductiva; Nitrogen; Potassium; Vegetative stage; Reproductive stage; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2169

Zebra Mussel Farming in the Szczecin (Oder) Lagoon: Water-Quality Objectives and Cost-Effectiveness
Provedor de dados: 7
Autores: Schernewski, Gerald; Leibniz-Institute for Baltic Sea Research; schernewski@eucc-d.de; Stybel, Nardine; EUCC - The Coastal Union Germany; stybel@eucc-d.de; Neumann, Thomas; Leibniz-Institute for Baltic Sea Research; thomas.neumann@io-warnemuende.de.
The Oder (Szczecin) Lagoon in the southern Baltic Sea is a heavily eutrophicated and degraded coastal ecosystem. We applied a systems approach framework to critically evaluate whether existing water-management measures achieve water-quality objectives for the river and lagoon systems. Our simulations reveal that the existing water-quality objectives for the river and the coastal waters are not sufficiently complementary. We suggest new water-quality threshold concentrations, which are in agreement with the European Water Framework Directive, and we calculate acceptable maximum nutrient loads for the Oder River. These calculations suggest that external nutrient-load reductions in the river basin alone seem insufficient to achieve good water quality in the...
Tipo: Peer-Reviewed Reports
Palavras-chave: Baltic Sea Action Plan; Coastal ecosystem; Cost-benefit analysis; ERGOM; Eutrophication; Marginal costs; Mussel farming; Nitrogen; Oder Lagoon; Oder River; Phosphorus; Szczecin Lagoon; Water Framework Directive; Water management; Water quality; Zebra mussels (Dreissena polymorpha).
Ano: 2012

Optimizing nitrogen rates in the midwestern United States for maximum ecosystem value
Provedor de dados: 7
Autores: Ewing, Patrick M; University of Minnesota, Department of Agronomy and Plant Genetics ; ewing069@umn.edu; Runck, Bryan C; University of Minnesota, Department of Geography, Environment and Society; runck014@umn.edu.
The importance of corn production to the midwestern United States cannot be overestimated. However, high production requires high nitrogen  fertilization, which carries costs to environmental services such as water quality. Therefore, a trade-off exists between the production of corn yield and water quality. We used the Groundwater Vulnerability Assessment for Shallow depths and Crop Environment Resource Synthesis-Maize models to investigate the nature of this trade-off while testing the Simple Analytic Framework trade-offs featured in this Special Feature. First, we estimated the current levels of yield and water quality production in northeastern Iowa and southern Minnesota at the 1-square-kilometer, county, and regional scales. We then constructed an...
Tipo: Peer-Reviewed Reports
Palavras-chave: Agriculture; Agroecology; Corn belt; DSSAT; Fertilization rate; Frontier analysis; Groundwater nitrate; GWAVA-S; Land use; Nitrogen; Rotation; Row crops; Simple Analytics Framework; Yield.
Ano: 2015

NUTRIENT REMOVAL FROM SWINE WASTEWATER IN A COMBINED VERTICAL AND HORIZONTAL FLOW CONSTRUCTED WETLAND SYSTEM
Provedor de dados: 70
Autores: Bôas,Regina B. Vilas; Fia,Ronaldo; Fia,Fátima R. L.; Campos,Alessandro T.; Souza,Gabriela R. de.
ABSTRACT This study aimed to assess the performance of a combined vertical flow (VFCW) and horizontal subsurface-flow (HFCW) constructed wetland systems built on a pilot scale and submitted to different configurations and organic load application rates of pre-treated swine wastewater (SWW) in anaerobic systems on the nitrogen and phosphorus removal. The average values of redox potential in the systems were between anoxic and aerobic conditions, favoring an increased nitrate concentration in VFCW. Nitrogen removal by VFCW–HFCW system can be considered as satisfactory, reaching removal values of 75%. VFCW and HFCW proved to be limited in phosphorus removal, reaching values of 48%.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon spp; Phosphorus; Nitrogen; Post-treatment; Typha sp.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300411

CHEMICAL AGENTS AND SHADING LEVELS FOR THE PRODUCTION OF PEPPER SEEDLINGS
Provedor de dados: 70
Autores: Binotti,Eliana D. C.; Costa,Edilson; Binotti,Flávio F. da S.; Batista,Thiago B.
ABSTRACT The aim of this study was to evaluate protected cultivation environments with different levels of shading and application of foliar chemical agents, on growth, photosynthetic pigments and seedling quality of Capsicum frutensens L. The experiment was developed at the State University of Mato Grosso do Sul, University Unit of Cassilândia, with chili pepper. Three cultivation environments (screen of 18, 35 and 50% of shading) and six leaf chemical agents were used [(1) control – without application; (2) Nitrogen (N) 1%; (3) Paclobutrazol 50 mg L-1 + N 1%; (4) Auxin 0.05 g L-1 + N 1%; (5) Gibberellin 0.05 g L-1 + N 1%; and (6) Auxin 0.05 g L-1 + Gibberellin 0.05 g L-1 + N 1%]. Each environment was considered an experiment in which the completely...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auxin; Capsicum frutensens L; Gibberellin; Light; Nitrogen; Paclobutrazol.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400450

Composted sewage sludge in replacement of mineral fertilization on wheat production and development
Provedor de dados: 70
Autores: KUMMER,ANA C. B.; GRASSI FILHO,HELIO; LOBO,THOMAZ F.; LIMA,RODOLLPHO A. DE S.
ABSTRACT Several research lines are required to ensure a proper disposal of sewage sludge in Brazil; among them, we may highlight agricultural use. In this sense, this study aimed at assessing the effect of exchanging nitrogen sourcing via conventional fertilization (chemical) with growing doses of composted sewage sludge (CSS) on wheat crop performance. The experiment was performed in a completely randomized design with seven treatments and ten replications, being defined as T0 (control – without fertilization); T1 (100% mineral fertilization); T2 (50% mineral + 50% CSS); T3, T4, T5, and T6 (100, 150, 200, and 250% nitrogen fertilizing from CSS). Results showed that the use of CSS increased wheat production and development, therefore enhancing its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Organic fertilization; Production; Triticum aestivum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400706

Ratoon sugarcane yield integrated drip-irrigation and nitrogen fertilization
Provedor de dados: 70
Autores: Uribe,Raúl A. M.; Gava,Glauber J. de C.; Saad,João C. C.; Kölln,Oriel T.
The aim of this study was to compare the use of water and nitrogen on ratoon sugarcane during irrigated and rain-fed conditions, and to assess the production potential of stalks and sugar with different rates of N-fertilizer on the subsurface drip-irrigated management. The experimental design was a randomized block with four replications for each experiment and treatments: (T1) irrigated, 0kg N ha-1; (T2) irrigated, 70kg N ha-1; (T3) irrigated, 140kg N ha-1; (T4) irrigated, 210kg N ha-1; (T5) not irrigated, 0kg N ha-1, and (T6) not irrigated, 140kg N ha-1. Biometric, technological, dry matter and yield variables were analyzed among the treatments. The irrigation system together with the application of N-fertilizer at 140kg ha-1 presented significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertigation; Nitrogen; Water stress; Sacharum spp.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600005

MORPHOGENIC AND STRUCTURAL CHARACTERISTICS OF MARANDU GRASS AFFECTED BY FERTIGATION WITH TREATED SEWAGE EFFLUENT AND CUTTING HEIGHT
Provedor de dados: 70
Autores: Dantas,Geffson de F.; Faria,Rogério T. de; Costa,Natã R.; Santos,Gilmar O.; Ferraudo,Antonio S.
ABSTRACT The response of biomass flow components of forage from the interaction between fertigation with wastewater and cutting height during the year is little known. The objective of this work was to verify the responses of morphogenic and structural characteristics of Urochloa brizantha as a function of fertigation application strategies with sewage treatment plant effluent (TSE), complemented with urea (U), associated with harvest with two plant heights during the dry and rainy periods. The forage cutting heights were 30 cm (H1) and 40 cm (H2), and nitrogen fertilization doses were 9.1 (D1), 12.1 (D2), 22.5 (D3), 26.6 (D4), and 34.0 (D5) kg of N per Mg−1 of dry matter (DM) produced, applied by TSE via fertigation, plus 7.5 kg N per Mg−1 of DM produced,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Defoliation; Nitrogen; Water reuse.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600692

Using an aerial system of remote sensing to detect different nutritional status in Brachiaria decumbens
Provedor de dados: 70
Autores: Silva Júnior,Mário C. da; Pinto,Francisco de A. De C.; Queiroz,Daniel M. de; Vieira,Luciano B.; Resende,Ricardo C. de.
The aim of this study was to use digital images acquired by cameras attached to a helium balloon to detect variation of the nutritional status in Brachiaria decumbens. The treatments consisted of five doses of nitrogen (0, 50, 100, 150 e 200kg ha-1) with six replications each, evaluated in a completely randomized statistical design. A remote sensing system composed of digital cameras and microcomputers was used for image acquisition, and a helium balloon lifted the cameras to the heights of 15, 20, 25 and 30m. A portable chlorophyll meter and analyses of leaf nitrogen content were used to make comparisons with data obtained by the remote sensing system. Data was acquired in two phases, in different climatic conditions. At the end of each phase, dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital images; Vegetation indices; Nitrogen.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500016

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee
Provedor de dados: 70
Autores: Bruno,Marcelo; Oliveira,Roberto A. de.
In this study it was evaluated the efficiency of the treatment of wet-processed coffee wastewater in upflow anaerobic sludge blanket (UASB) reactors in two stages, in bench scale, followed by post-treatment with activated sludge in batch. The first UASB reactor was submitted to an hydraulic retention time (HRT) of 6.2 d and organic loading rates (OLR) of 2.3 and 4.5g CODtotal (L d)-1, and the second UASB reactor to HRT of 3.1 d with OLR of 0.4 and 1.4g CODtotal (L d)-1. The average values of the affluent CODtotal increased from 13,891 to 27,926mg L-1 and the average efficiencies of removal of the CODtotal decreased from 95 to 91%, respectively, in the UASB reactors in two stages. The volumetric methane production increased from 0.274 to 0.323L CH4 (L...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobic digestion; Methane; Nitrogen; Phosphorus; Phenols.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400020

FUZZY MODELING ON WHEAT PRODUCTIVITY UNDER DIFFERENT DOSES OF SLUDGE AND SEWAGE EFFLUENT
Provedor de dados: 70
Autores: Putti,Fernando F.; Kummer,Ana C. B.; Grassi Filho,Helio; Gabriel Filho,Luís R. A.; Cremasco,Camila P.
ABSTRACT: This study aimed to evaluate the effects of fertilization with composted sewage sludge and irrigation with drinking water (DW) and fertigation with wastewater (WW) in wheat crop using fuzzy rule-based system. The experiment was conducted in the Department of Soil and Environmental Resources, of FCA, UNESP - Botucatu, with factorial 6 × 2, which were applied 6 doses of sewage sludge (0, 50, 100, 150, 200 and 250% of nitrogen recommendation) and two types of effluents (treated water and sewage). In the developing of the system based in fuzzy rules, it was used the Mamdani inference method, where the input variables were sewage sludge doses and water types and the output variables used were the number of tillers, length and number spike per plant;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sustainability; Nitrogen; Mamdani; Fuzzy system.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601103

Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
Provedor de dados: 72
Autores: Rabalais,Nancy N.
The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to...
Tipo: Journal article
Palavras-chave: Anoxia; Hypoxia; Eutrophication; Nutrients; Nitrogen.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015

NO AND N2O FLUXES FROM A BELGIAN FOREST AFFECTED BY ELEVATED NITROGEN DEPOSITION
Provedor de dados: 73
Autores: Boeckx,Pascal; Vervaet,Hilde; Cleemput,Oswald van.
Nitrous oxide (N2O) and nitric oxide (NO) are important atmospheric trace gases, and soils (including forest soils) are a substantial source of both gases. In forests subjected to elevated N deposition these emissions are considered as indirect emissions from agricultural N sources (mainly NH3) or combustion (e.g. NOx from traffic). However, knowledge about N2O and NO exchange between forests and the atmosphere is scarce. The aim of this study was to determine N2O and NO emission rates from a deciduous forest in Belgium, receiving a high N-deposition (ca. 40 kg N ha-1 yr-1). In April 2000, the NO emission from the forested location was 17.3 (± 1.2) and 17.05 (± 0.7) ng NO-N m-2 s-1, respectively, for the soil including the organic layer and the mineral...
Tipo: Journal article
Palavras-chave: Emission; Forest soil; Nitrogen; Cycling; Nitric oxide; Nitrous oxide.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200003

Dry deposition of nitrogen to passive samplers in grassland and forest canopies in the Central depression of southern Chile
Provedor de dados: 73
Autores: Godoy,Roberto; Haneke,Jörgen; Staelens,Jeroen; Oyarzún,Carlos; Paulino,Leandro; Barrientos,Mónica.
The growth of intensive livestock farming in the central depression of southern Chile (40° S) during the last century has resulted in elevated emissions of inorganic nitrogen (N) compounds into the atmosphere, particularly of NH3. Consequently, atmospheric N has been deposited to lakes, vegetation, and soil. Much attention has been paid to wet N deposition in southern Chile, while almost nothing is known about dry N deposition in this region. Our aim is to use an exploratory approach with SAM (Standard Air Monitoring) filters to investigate the potential contribution of the dry N deposition to the total N deposition in the central depression of southern Chile. Furthermore, the relationship between micro-climatological patterns and dry deposition was...
Tipo: Journal article
Palavras-chave: Atmospheric deposition; Nitrogen; Nothofagus obliqua forest; Pinus radiata plantation; Surrogate surface.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200006

SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
Provedor de dados: 73
Autores: Lusk,Christopher H.; Matus,Francisco; Moreno-Chacón,María; Saldaña,Alfredo; Jiménez-Castillo,Mylthon.
Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at...
Tipo: Journal article
Palavras-chave: Nitrogen; Nutrient cycling; Phosphorus; Plant nutrition; Resorption.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006

Genetic diversity and symbiotic compatibility among rhizobial strains and Desmodium incanum and Lotus spp. plants
Provedor de dados: 74
Autores: Granada,Camille E; Strochein,Marcos; Vargas,Luciano K; Bruxel,Manuela; Sá,Enilson Luiz Saccol de; Passaglia,Luciane M.P.
This work aimed to evaluate the symbiotic compatibility and nodulation efficiency of rhizobia isolated from Desmodium incanum, Lotus corniculatus, L. subbiflorus, L. uliginosus and L. glaber plants by cross-inoculation. Twelve reference strains and 21 native isolates of rhizobia were genetically analyzed by the BOX-PCR technique, which showed a high genetic diversity among the rhizobia studied. The isolates were also characterized based on their production of indolic compounds and siderophores, as well as on their tolerance to salinity. Fifteen of the 33 rhizobia analyzed were able to produce indolic compounds, whereas 13 produced siderophores. All the tested rhizobia were sensitive to high salinity, although some were able to grow in solutions of up to 2%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizobia; Nodulation; Nitrogen; Specificity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000300012

Orchid in vitro growth as affected by nitrogen levels in the culture medium
Provedor de dados: 75
Autores: Tavares,Armando R; Young,Jorge Luiz M; Ori,Sandra S; Kanashiro,Shoey; Lima,Giuseppina PP; Chu,Edison Paulo; Suzuki,Rogério M.
In vitro cultivation is the main propagation method for the family Orchidaceae, whereas nitrogen is the most important nutrient in the culture media. This work was carried out to study the influence of different nitrogen concentrations on the in vitro growth of the orchid Phalaenopsis amabilis. Nitrogen concentrations varied by altering the ionic balance of the Murashige &amp;amp; Skoog (MS) culture medium. Plants, 360 days old, were cultivated in liquid MS, modified with 7.5, 15, 30, 45, and 60 mM N. After 180 days, we assessed plant and root length, number of leaves and roots, and fresh and dry weight of leaves, roots and plants. Treatments were assigned to completely randomized plots, with four replications. Plots consisted of five three-plant flasks....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phalaenopsis amabilis; MS; Mineral nutrition; Nitrogen.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000100020

Plant density and nitrogen fertilization in Swiss chard
Provedor de dados: 75
Autores: Echer,Márcia de M; Zoz,Tiago; Rossol,Charles Douglas; Steiner,Fábio; Castagnara,Deise D; Lana,Maria do C.
An experiment was conducted to evaluate the effect of plant spacing and nitrogen fertilization on Swiss chard's yield, from September to November 2009. The experimental design was of randomized blocks in split plot with four replications. In the plots were allocated the two plant spacings (0.30 and 0.50 m) and in the subplots the five doses of nitrogen (0, 40, 80, 120 and 160 kg ha-1). The crop was harvested 90 days after transplanting. The plant spacing of 0.50 m provided increased production of total fresh weight of shoot (961.7 g plant-1) and marketable (873.1 g plant-1). However, the highest total yield (77.8 t ha-1) and marketable (64.5 t ha-1) was achieved with the smaller spacing between plants (0.30 m). The N rates applied in coverage until 160 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta vulgaris var. cycla; Nitrogen; Yield.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000400023

Improving sweet pepper yield and quality by means of fertigation management
Provedor de dados: 75
Autores: Oliveira,Francisco A; Duarte,Sergio N; Medeiros,José F; Lima,Carlos JGS; Oliveira,Mychelle KT; Silva,Ricardo CP.
ABSTRACT Fertigation can be managed using fixed fertilizer doses or by assessing the ionic concentration of soil solution throughout the growing period. This work studied how different fertigation management systems affected sweet pepper yield and quality. The experiment was carried out in greenhouse, in pots. Fertigation was managed according to the crop uptake rate (M1) or by monitoring either the electrical conductivity (M2) or the N and K concentration (M3) in the soil solution. Fertigation management was combined with six N and K doses (0, 50, 100, 150, 200 and 300% of the recommended dose for sweet pepper in the region), in complete blocks at random, with four replications, and treatments in 3x6 factorial. Dry matter accumulation, yield and fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Ionic concentration; Porous cup extractors; Nitrogen; Potassium; Electrical conductivity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200235

Sources and splitting of the organic fertilization in top dressing in cabbage production
Provedor de dados: 75
Autores: Cardoso,Antonio Ismael Inácio; Oliveira,Jéssica B; Lanna,Natália BL; Candian,Joara S; Castro,Jean Lucas M.
ABSTRACT Although there exist researches about fertilization in top dressing in the production of cabbage, these are usually made with inorganic fertilizers, being rare the researches with organic fertilization in top dressing in the production of most vegetables. The objective was to evaluate the effect of different splitting of two organic fertilizers in top dressing in the production of cabbage. Six treatments were evaluated, with four replications in randomized block design. The six treatments were the result of the factorial 3x2, with three types of splitting (1/3+1/3+1/3; 4/6+1/6+1/6; 1/6+4/6+1/6 of the total dose in each application) and two organic fertilizers (castor bean cake and organic compost). The total dose of each fertilizer was calculated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var capitata; Nitrogen; Castor bean cake; Organic compost.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000200230

ИЗМЕНЧИВОСТЬМОРФОМЕТРИЧЕСКИХ ПРИЗНАКОВ DUNALIELLA SALINA В УСЛОВИЯХ КУЛЬТУРЫ
Provedor de dados: 13
Autores: Антоненко, С. П.; Догадина, Т. В.; Комаристая, В. П.
Выявлена изменчивость размеров и формы, биохимических показателей Dunaliella salina в зависимости от обеспеченности культуры азотом и фосфором. Рассматривается возможность использования этих признаков для индикации содержания биогенов в природных водоёмах. http://biotex.ibss.org.ua/
Tipo: Journal Contribution
Palavras-chave: Морфометрические признаки; Dunaliella salina; Азот; Фосфор; Морфометричні ознаки; Morphometric signs; Nitrogen; Phosphorus.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1864

Численные оценки регенерационного потока азота в открытой части Чёрного моря
Provedor de dados: 13
Autores: Пархоменко, А. В.
Рассмотрены результаты расчётов экскреции азота зоопланктоном в глубоководной области Чёрного моря. Скорость экскреции азота зоопланктоном в слое 0 – 150 м зимой варьировала от 20 до 23, весной – 34 - 59, летом – 66 – 86, осенью – 89 - 28 мгN·м–2·сут-1. Средняя величина регенерационной первичной продукции, рассчитанная относительно первичной продукции, измеренной радиоуглеродным методом, зимой составляла  24 %, весной – 49 %, летом – 91 %, осенью – 76 %, в среднем за год – 60 %. Обсуждается вопрос о роли регенерационного потока азота в формировании первичной продукции в эвфотическом слое открытой части Чёрного моря.
Tipo: Journal Contribution
Palavras-chave: Азот; Экскреция; Зоопланктон; Чёрное море; Nitrogen; Excretion; Zooplankton; Black Sea Nitrogen Excretion Zooplankton Nitrogen Zooplankton Excretion http://aims.fao.org/aos/agrovoc/c_5192 http://aims.fao.org/aos/agrovoc/c_15490 http://aims.fao.org/aos/agrovoc/c_2750.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/302

Особенности вторичного каротиногенеза  Haematococcus pluvialis Flotow (Chlamydomonadales) при различных условиях минерального обеспечения.
Provedor de dados: 13
Autores: Терентьева, Н. В.; Минюк, Г. С.; Дробецкая, И. В.; Чубчикова, И. Н.
Исследовано влияние концентрации азота и фосфора в среде на скорость роста и накопление астаксантина в вегетативных клетках зелёной микроводоросли Haematococcus pluvialis при выращивании методом одностадийной полупроточной культуры. Показано, что необходимым условием сохранения монадной структуры, деления клеток на протяжении длительного периода и накопления в них астаксантина является поддержание минимального уровня биогенных элементов в среде в пределах 0.2-0.4 мМ N и 0.01-0.02 мМ Р.
Tipo: Journal Contribution
Palavras-chave: Haematococcus pluvialis; Культивирование; Астаксантин; Азот; Фосфор; Cultivation; Astaxanthin; Nitrogen; Phosphorus; Культивування.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/833

Nutrient enrichment effect on macroinvertebrates in a lowland stream of Argentina
Provedor de dados: 76
Autores: Cortelezzi,Agustina; Ocón,Carolina; Oosterom,María V. López van; Cepeda,Rosana; Capítulo,Alberto Rodrigues.
ABSTRACT One of the most important effects derived from the intensive land use is the increase of nutrient concentration in the aquatic systems due to superficial drainage. Besides, the increment of precipitations in South America connected to the global climate change could intensify these anthropic impacts due to the changes in the runoff pattern and a greater discharge of water in the streams and rivers. The pampean streams are singular environments with high natural nutrient concentrations which could be increased even more if the predictions of global climate change for the area are met. In this context, the effect of experimental nutrient addition on macroinvertebrates in a lowland stream is studied. Samplings were carried out from March 2007 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus; Nitrogen; Fertilization; Invertebrate abundance; Climate change.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000200228

Morfofisiologia do milho inoculado com Azospirillum brasilense submetido à restrição hídrica e adubação nitrogenada.
Provedor de dados: 14
Autores: JALES, H. F.; MAGALHAES, P. C.; RONCHI, C. P.; PAIVA, A. P. L. de; CARVALHO, L. P. de; GOMES JÚNIOR, C. C.
A disponibilidade de água e nitrogênio nos solos de cultivo brasileiros é vital ao metabolismo das plantas. Na busca por recursos que mitiguem o efeito da seca e da disponibilidade de nitrogênio (N), destacase o uso de bactérias diazotróficas. Nesse sentido, objetivou-se avaliar o crescimento do milho inoculado com estirpes de Azospirillum brasilense, submetido a dois níveis de N e a duas condições hídricas. O ensaio foi conduzido em vasos, mantidos em casa de vegetação, no qual foram testados os inoculantes Az1, Az2, Az3, e Az4 (mistura do inoculante Az1 com Az2 ), além de um tratamento sem inoculação, submetido a dois níveis de N (N1 - 156 kg ha-1 e N2 - 312 kg ha-1) aplicados em cobertura e a duas condições hídricas [irrigado ? solo na capacidade de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Déficit hídrico; Water deficit; Zea Mays; Inoculação; Bactéria; Fertilizante Nitrogenado; Deficiência Hídrica; Nitrogênio; Nitrogen.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133168

Efeito da irrigação no movimento de nitratos em um latossolo.
Provedor de dados: 14
Autores: MILLAR, A. A.; PEREIRA, J. R.; LOPES FILHO, F.
Perdas de nutrientes ocorrem em solos irrigados mediante o processo de fluxo de massa. Os latossolos do Sub médio São Francisco devido a sua testura média, quando irrigados, estão expostos a lixiviação de seus nutrientes o que é de grande importância para uma agricultura econômica e produtiva. Testes de laboratórios foram conduzidos em colunas de solo para estudar o efeito da irrigação no movimento de nitratos em um latossolo do Projeto de Irrigação do Bebedouro da SUVALE.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Fluxo de irrigação; Adubo nitrogenado; Submédio São Francisco; Projeto de Irrigação do Bebedouro; SUDENE; Solo; Latossolo; Irrigação; Nitrato; Adubação; Soil; Nitrogen.
Ano: 1979
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/160474

Estimativa da emissão de gases de efeito estufa e da volatilização de amônia em sistemas de manejo de solo e de sucessão/rotação de culturas com trigo.
Provedor de dados: 14
Autores: SANTI, A.; SANTOS, H. P. dos; BAYER, C.; DALMAGO, G. A.; DE BONA, F. D.; SILVA, E. L. da; SCHERER, L. A.; ZEIST, C.
bitstream/item/162965/1/ID44098-2017CTO32.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Plantio convencional; Plantio direto; Metano; Nitrogênio; No-tillage; Methane; Nitrogen; Planting.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1074307

Adubação nitrogenada suplementar tardia na soja cultivada em latossolos de Cerrado.
Provedor de dados: 14
Autores: MENDES, I. de C.; REIS JÚNIOR, F. B. dos; HUNGRIA, M.; SOUSA, D. M. G. de; CAMPO, R. J.; AGUIAR, J. L. P.; SOUSA, T. C. R. de.
RESUMO: Foi avaliado o efeito da suplementação tardia (pré-florescimento e início do enchimento de grãos) com diferentes fonte de adubo nitrogenado (uréia, nitrato de amônio e sulfato de amônio) no rendimento da soja cultivada em latossolos de Cerrado. Quinze experimentos foram conduzidos na Embrapa Cerrados, no período de 2000 a 2005, em latossolos com populações estabelecidas de Bradyrhizobium capazes de nodular a soja. Em apenas dois experimentos, a resposta da soja à adubação tardia com nitrogênio foi estatisticamente significativa. Considerando-se o custo do adubo nitrogenado e o preço da soja, foi verificado que a adubação tardia com nitrogênio não acarreta nenhum lucro para os produtores, já que o custo de produção com adoção dessa prática supera as...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Adubação; Fixação de Nitrogênio; Fertilizante Nitrogenado; Glycine Max; Nitrogênio; Soja.; Fertilizer application; Nitrogen; Nitrogen fertilizers; Nitrogen fixation; Soybeans.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571954

Manejo de irrigação e fertilização nitrogenada para a cultura do algodoeiro na região do cerrado.
Provedor de dados: 14
Autores: GUERRA, A. F.; RODRIGUES, G. C.; NAZARENO, R. B.; SARAIVA, M. A. de P.
RESUMO: O objetivo deste trabalho foi estabelecer o manejo de irrigação que associado a doses e épocas de aplicação de nitrogênio possibilite elevadas produções de algodão com qualidade compatível com as exigências de mercado, visando ao sucesso da agricultura irrigada da Região do Cerrado. O manejo das irrigações foi feito com base em mediações de tensões de água no perfil do solo. Foram medidos os valores de tensão de água no perfil do solo, a quantidade de água aplicada por irrigação, a produtividade e os componentes de produção e o desenvolvimento das plantas. Depois da colheita, o algodão foi analisado quanto a quantidade de fibra. Os resultados indicam que para produtividade em torno de 5.000 kg/ha a irrigação suplementar do algodoeiro pode ser feita...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Tensão; Drought stress; Irrigation equipment.; Água; Algodão; Cerrado; Deficiência Hídrica; Fertilizante Nitrogenado; Manejo de Água; Irrigação; Nitrogênio; Tensiômetro.; Cotton; Irrigation; Nitrogen; Nitrogen fertilizers; Soil water potential; Water management.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567797

Carência de macronutrientes e de boro em plantas de juta (Corchorus capsularis L.), variedade roxa.
Provedor de dados: 14
Autores: VIEGAS, I. de J. M.; HAAG, H. P.; SILVA, J. F. da; MONTEIRO, F. A.
bitstream/item/32693/1/CPATU-BP138.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Macronutriente; Fertilizer; Deficiency; Macronutrient; Potasium; Sulphur.; Adubação; Boro; Cálcio; Deficiência; Enxofre; Fósforo; Juta; Magnésio; Nitrogênio; Potássio.; Boron; Calcium; Jute; Magnesium; Nitrogen; Phosphorus.
Ano: 1992
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/380546

Resumo executivo Projeto Nucleus: 2016-2018.
Provedor de dados: 14
Autores: FERREIRA, C. M.; SILVA, M. A. S. da; MACHADO, P. L. O. de A.; CARVALHO, M. T. de M.; RODRIGUES, C. R.; SANTOS, A. B. dos; HEINEMANN, A. B.; DAMIN, V.; CASTOLDI, G.; MADARI, B. E.; FLORES, R. A.
Português: O objetivo do Projeto Nucleus é aprimorar a eficiência de uso do nitrogênio (EUN), por meio da ampliação, compreensão e superação das lacunas de conhecimento sobre aspectos agronômicos, melhorando a sincronia entre a disponibilidade de N do solo em quantidade adequada e a necessidade das plantas e, em consequência, proporcionar condições de melhorar o seu aproveitamento e reduzir perdas. Assim, a investigação de fontes, práticas e manejos menos propensos a perdas de N, propiciam à cultura expressar o seu potencial produtivo, reduzindo custos e impactos nos aspectos social e ambiental e contribuindo para a segurança alimentar. Inglês: The objective of Nucleus project is to enhance our understanding of the key agronomic aspects of nitrogen use...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Nitrogênio; Relação Solo-Planta; Segurança Alimentar; Transferência de Tecnologia; Nitrogen; Biochar; Soil-plant interactions; Technology transfer.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1101031

Efeito da lamina de irrigacao e da adubacao nitrogenada na producao de graos de milho.
Provedor de dados: 14
Autores: SILVA, M. A. da; MILLAR, A. A.; OLIVEIRA, C. A. V.; MARTINS, C. E.; BANDEIRA, R. E.; NASCIMENTO, T.
A exploracao da cultura do milho, no Nordeste brasileiro, e feita geralmente sob condicoes de dependencia de chuva. Neste trabalho, estudou-se o efeito da lamina de irrigacao, conteudo de agua no solo, adubacao nitrogenada e interacao entre esses fatores na producao de graos de milho. Verificou-se que a aplicacao de agua e nitrogenio causaram efeito linear, aumentando a producao de graos de milho, dentro dos limites estudados e analisados.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Fertilizer applications; Maiz; Irrigação; Adubação; Fertilidade; Nitrogênio; Milho; Solo; Zea Mays; Irrigation; Nitrogen; Soil.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133333

Agricultura e qualidade da agua: contaminacao da agua por nitrato.
Provedor de dados: 14
Autores: RESENDE, A. V. de.
bitstream/CPAC-2009/24718/1/doc_57.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Contamination; Health.; Contaminação; Fósforo; Impacto Ambiental; Nitrogênio; Poluição da Água; Saúde.; Recurso Hídrico; Qualidade da Água; Environmental impact; Eutrophication; Nitrates; Nitrogen; Phosphorus; Water resources.; Water quality; Water pollution.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546464

Avaliação in sílico da adubação nitrogenada no feijoeiro nas épocas das águas e de inverno no estado de Goiás.
Provedor de dados: 14
Autores: JUSTINO, L. F.; BATTISTI, R.; STONE, L. F.; SILVA, S. C. da; HEINEMANN, A. B.
O trabalho objetivou avaliar, in sílico, o efeito de diferentes doses e épocas de aplicação de nitrogênio (N) na produtividade do feijão-comum, em duas épocas de cultivo, águas e seca, para as condições edafoclimáticas do estado de Goiás. O modelo de cultura CSM Cropgro-Dry Bean foi parametrizado, validado e aplicado na simulação da produtividade, considerando doses aplicadas na semeadura e em cobertura. A dose de N e a data de semeadura tiveram maior relevância na época das águas, cujas produtividades aumentaram com a semeadura precoce e altas doses de N. Na época de inverno, a dose de N também foi o fator mais importante para obtenção de altas produtividades. O maior retorno econômico da cultura foi obtido com doses de N de 60/180 kg ha-1 e 40/120 kg...
Tipo: Folhetos
Palavras-chave: Goiás; Feijão; Phaseolus Vulgaris; Nitrogênio; Época de Semeadura; Modelo de Simulação; Análise Econômica; Fertilizante Nitrogenado; Beans; Planting date; Crop models; Economic analysis; Nitrogen; Nitrogen fertilizers.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1144395

Desenvolvimento inicial e nutrição do vinhático em áreas de cerrado degradado.
Provedor de dados: 14
Autores: DUBOC, E.; GUERRINI, I. A.
RESUMO: Os solos ácidos do Bioma Cerrado apresentam limitações no que se refere à fertilidade. A adição de nutrientes pode aumentar a chance de sucesso dos plantios de recuperação de áreas degradadas, entretanto existem poucos estudos sobre os efeitos da fertilização a campo de espécies nativas do bioma. O principal objetivo deste trabalho foi determinar o efeito de doses de nitrogênio (N) e fósforo (P) em mudas de vinhático (Plathymenia reticulata Benth.) plantadas em áreas ocupadas com pastagem de Brachiaria decumbens, em um Latossolo Vermelho-Amarelo, onde originalmente havia um Cerrado Denso e em um Plintossolo, no entorno de uma Mata de Galeria. Foi avaliada a resposta do vinhático em crescimento e em sobrevivência, na ausência e a doses de 10, 20 e...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Planta nativa; Vinhático; Plathymenia reticulata; Indigenous organisms; Native trees; Revegetation; Código Florestal.; Cerrado; Fósforo; Nitrogênio; Revegetação.; Phosphorus.; Nitrogen.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559662

Perfilhamento, altura e clorofila na cana-de-açúcar em função do recolhimento da palha residual e escarrificação das soqueiras.
Provedor de dados: 14
Autores: FAVARIN, E. H. V.; LINHARES, L. T.; DIAS, K. N.; SILVA, C. J. da.
bitstream/item/148560/1/30-perfilamento.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Preparo do solo; Bioeletricidade; Soil preparation.; Nitrogênio; Plantio Direto.; Bioelectricity; Nitrogen; No-tillage.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1054337

Eficiencia da fixacao biologica do N2 e capacidade competitiva das estirpes SEMIA 566, SEMIA 586, SEMIA 5079 E SEMIA 5080 inoculadas em soja (Glycine max(L.) Merrill).
Provedor de dados: 14
Autores: NISHI, C. Y. M.; HUNGRIA, M.
bitstream/item/121894/1/ID-2139-.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Fixacao biologica; Brasil; Cultivar BR-16; Cultivar IAC-a; Soybean; Biological fixation; Inoculation; Variety; Bradyrhizobium Japonicum; Glycine Max; Inoculação; Nitrogênio; Soja; Brazil; Nitrogen.
Ano: 1993
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445525

Desenvolvimento inicial e nutrição da cagaita em áreas de Cerrado degradado.
Provedor de dados: 14
Autores: DUBOC, E.; GUERRINI, I. A.
RESUMO: Apesar das limitações em fertilidade dos solos ácidos do Cerrado, as plantas nativas do bioma possuem diferentes mecanismos de adaptação. O objetivo deste trabalho foi determinar o efeito de doses de nitrogênio (N) e fósforo (P) em mudas de cagaita (Eugenia dysenterica Mart. ex DC.) plantadas em áreas ocupadas com pastagem de Brachiaria decumbens; em um Latossolo Vermelho-Amarelo, onde originalmente havia um Cerrado Denso e em um Plintossolo no entorno de uma Mata de Galeria. Foi avaliada a resposta da cagaita em crescimento e em sobrevivência, na ausência e a doses de 10, 20 e 40 kg ha-1 de N, na forma de uréia e na ausência e a doses de 10, 20 e 40 kg ha-1 de P, na forma de superfosfato triplo, em delineamento experimental de blocos ao acaso. Foi...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fruta nativa; Indigenous organisms; Revegetation.; Cagaita; Cerrado; Eugenia Dysenterica; Fósforo; Nitrogênio; Revegetação.; Phosphorus.; Nitrogen.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572274

Recomendação de dose de lodo de esgoto: a questão do nitrogênio.
Provedor de dados: 14
Autores: PIRES, A. M. M.; ANDRADE, C. A. de.
Resumo: Considerações sobre a dose de lodo de esgoto adequada que deve ser aplicada nas culturas de acordo com a regulamentação fornecida pela Resolução n. 375 do CONAMA e tendo em vista experimentos que aferiram os valores da fração de mineralização do nitrogênio (FMN).
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Lodo de esgoto; Adubo de esgoto; Nitrogênio; Adubo orgânico; Fertilizante nitrogenado; Lodo residual; Sewage sludge; Nitrogen fertilizers; Organic fertilizers; Nitrogen; Mineralization.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1004771

Alterações na matéria orgânica e nas características químicas de um Podzol hidromórfico sob pastagens cultivadas no Pantanal Sul-Mato-Grossense.
Provedor de dados: 14
Autores: FERNANDES, F. A.; CERRI, C. C.; FERNANDES, A. H. B. M.
Estudou-se uma cronosseqüência de introdução de pastagens cultivadas em áreas com 10 e 20 anos de implantação, tendo uma área de Cerrado intacto como referência. Coletaram-se amostras até 40cm de profundidade ao longo de dois transectos, para cálculo dos estoques de C e N e determinações químicas. Também abriram-se trincheiras e coletaram-se amostras de solo até 1m de profundidade, para estudo das variações nos conteúdos de C e N no perfil. Após 10 anos de cultivo, o solo apresentou aumento no teor de bases trocáveis e na capacidade de troca catiônica, e diminuição da acidez. Entretanto, após 20 anos, os teores de bases trocáveis e a capacidade de troca catiônica diminuíram e a acidez aumentou, indicando tendência do sistema de retornar ao equilíbrio...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Característica química; Bases trocáveis; Carbono orgânico; Frações húmicas; Chemical characteristics; Organic carbon; Humic fractions; Cultivated pasture.; Acidez; Fracionamento; Matéria Orgânica; Nitrogênio; Pastagem Cultivada; Solo.; Acidity; Pantanal; Fractionation; Exchangeable cations; Organic matter; Nitrogen; Soil.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810747

Fósforo, leguminosas e nitrogênio no melhoramento de pastagem de capim jaraguá em Marabá, Pará.
Provedor de dados: 14
Autores: CAMARÃO, A. P.; AZEVEDO, G. P. C. de; MARQUES, J. R. F.; SERRÃO, E. A. S.
bitstream/item/59378/1/CPATU-PA27.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Melhoramento de pastagem; Pará; Brasil; Grassland management.; Capim Jaraguá; Capim Colonião; Fósforo; Hyparrhenia Rufa; Leguminosa; Nitrogênio; Panicum Maximum.; Amazonia; Legumes; Phosphorus.; Nitrogen.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/384458

Adubação do tomateiro rasteiro no submédio São Francisco.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.; COSTA, N. D.; SOARES, J. M.; PINTO, J. M.
O objetivo desse trabalho foi fazer uma apresentação e avaliação dos aspectos técnicos relacionados à prática da adubação associada ao relato e à discussão de resultados de pesquisas obtidos com o tomateiro no Submédio São Francisco.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Tomate rasteiro; Macronutriente; Submédio São Francisco; Sulphur; Micronutrients; Tomato.; Tomate; Adubação; Cálcio; Enxofre; Fósforo; Magnésio; Lycopersicon Esculentum; Nitrogênio; Potássio.; Fertilizer application; Calcium; Magnesium; Nitrogen; Phosphorus; Potassium; Tomatoes.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134212

Influencia do teor de umidade no solo e da adubacao nitrogenada no rendimento de graos de feijao.
Provedor de dados: 14
Autores: SILVA, M. A. da; MILLAR, A. A.
Verificou-se a influencia do teor de agua no solo, do potencial matricial de agua no solo e da adubacao nitrogenada no rendimento de graos de feijao. O delineamento do experimento foi em blocos casualizados, com arranjo em faixas, com quatro repeticoes. Os tratamentos constaram da combinacao de cinco niveis com quatro repeticoes. Os tratamentos constaram da combinacao de cinco niveis de umidade e quatro de nitrogenio. Usou-se uma adubacao basica de 80 hg/ha de P2O5 e 20 kg/ha de K2O, tendo como fontes o superfosfato simples e o cloreto de potassio, respectivamente. O espacamento usado no plantio foi 1,50 m entre fileiras e 0,40 m entre covas, deixando-se duas plantas por cova, dando uma populacao de aproximadamente 33.000 plantas/ha. Foi utilizado o feijao...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Feijao-de-corda; Bean; Fertilizer applications; Irrigação; Adubação; Fertilidade; Nitrogênio; Solo; Vigna Unguiculata; Irrigation; Nitrogen; Soil.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133330

Produtividade do capim Marandu sob diferentes tensões hídricas no solo e doses de nitrogênio.
Provedor de dados: 14
Autores: VILELA, L.; LEITE, G. G.; GUERRA, A. F.; MARCELINO, K. R. A.; OLIVEIRA, M. V. F. de.
RESUMO: Este experimento foi conduzido na Embrapa Cerrados, Planaltina (DF), no período de março de 2000 a janeiro de 2001, em um Latossolo Vermelho-Escuro, textura argilosa. O objetivo foi o de avaliar o efeito de tensões de água no solo (35, 60, 100 e 500 kPa) e doses de nitrogênio (0, 30, 60, 120 kg/ha de N), exceto no primerio corte (0, 15, 30 e 60 kg/ha de N), na produção e na taxa de acúmulo de forragem em Brachiaria brizantha cv. Marandu. O delineamento experimental adotado foi o de blocos ao acaso, em parcelas divididas e três repetições. Nas parcelas foram alocadas as tensões e, nas subparcelas, as doses de nitrogênio. A tensão de água no solo afetou significativamente (P&lt;0,05) a produção de forragem apenas no período de crescimento da...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Cultivar Marandu; Eficiência; Tensão; Feed grasses; Efficiency.; Água; Brachiaria Brizantha; Capim Brachiaria; Gramínea Forrageira; Nitrogênio; Solo.; Nitrogen; Soil water potential; Varieties.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559759

Utilização do isótopo 15N para determinação do nitrogênio subterrâneo em soja.
Provedor de dados: 14
Autores: ARAÚJO, E. da S.; URQUIAGA, S.; BODDEY, R. M.; ALVES, B. J. R.
Exsudação de N pelo sistema radicular. Técnicas de marcação de plantas com 15N para determinação de N subterrâneo.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: N; Oil plant.; Isótopo; Nitrogênio; Planta Oleaginosa; Soja.; Isotopes; Oil crops; Nitrogen; Soybeans.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/627842

Manejo da agua e do nitrogenio no feijoeiro irrigado no cerrado.
Provedor de dados: 14
Autores: GUERRA, A. F.; SILVA, D. B. da; RODRIGUES, G. C.
bitstream/item/116852/1/rectec-13.pdf
Tipo: Recomendação Técnica (INFOTECA-E)
Palavras-chave: Bean; Brasil; Cultivar; Genética e melhoramento vegetal; Cultivar de Cultura anual.; Cerrado; Feijão; Glycine Max; Manejo de Água; Nitrogênio; Phaseolus Vulgaris; Soja.; Nitrogen; Varieties; Soybeans; Water management.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/563919

Dinâmica do nitrogênio no solo em áreas de cerrado e de pastagens cultivadas no Pantanal Sul Mato-Grossense.
Provedor de dados: 14
Autores: FERNANDES, F. A.; FERNANDES, A. H. B. M.
Um estudo foi conduzido em fazenda do Pantanal Sul Mato-Grossense, visando avaliar as alteracoes nas taxas de mineralizacao de N e nitrificacao liquidas no solo, em consequencia do desmatamento e implantacao de pastagens cultivadas. Foram tomadas dez amostras de solo compostas, em seis epocas a partir da semeadura da graminea, analisados os teores de amonia e nitrato, e calculadas as taxas de mineralizacao e nitrificacao. Os resultados mostraram que o desmatamento e implantacao de pastagem provocou alteracoes significativas na dinamica do nitrogenio do solo, com conteudos menores de amonia e maiores de nitrato, e menores taxas de mineralizacao e nitrificacao liquidas no solo das areas sob pastagem em relacao ao solo das areas sob cerrado nativo.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Pasture.; Nitrogênio; Mineralização; Pastagem; Solo.; Pantanal; Mineralization; Nitrogen; Soil.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/793305

Influência da adubação com nitrogênio, fósforo e potássio na formação de mudas de jaborandi.
Provedor de dados: 14
Autores: BRASIL, E. C.; VIEGAS, I. de J. M.
bitstream/item/59292/1/CPATU-ComTec100.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Produção de matéria seca; Belém; Pará; Brasil; Drug plants.; Adubação; Fósforo; Jaborandi; Muda; Nitrogênio; Potássio.; Planta Medicinal; Amazonia; Dry matter content; Fertilizer application; Potassium; Nitrogen; Phosphorus; Seedlings.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/375904

Efeito de níveis de nitrogênio e fósforo na recuperação de pastagens de Brachiaria brizantha cv. Marandu.
Provedor de dados: 14
Autores: COSTA, N. de L.; TOWNSEND, C. R.; MAGALHAES, J. A.
Procurou-se avaliar os efeitos de niveis de nitrogenio e fosforo sobre rendimento e composicao quimica da forragem de pastagens degradadas de Brachiaria brizantha cv. Marandu. Conclui-se que: Adubacao com nitrogenio e fosforo mostrou-se uma pratica agronomica tecnicamente viavel para recuperacao de pastagens de B. brizantha cv. Marandu; Rendimentos de MS, teores de PB e fosforo da graminea foram significativamente incrementados com aplicacao de niveis crescentes de nitrogenio e fosforo, ocorrendo o inverso em relacao as plantas invasoras; Aplicacao conjunta de 50kg de N/ha e de 100kg de P2 O5/ha foi suficiente para assegurar a recuperacao da pastagem, proporcionando resultados semelhantes aos obtidos com niveis maximos dos nutrientes.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Brachiaria brizantha cv Marandu; Embrapa Rondônia; Porto Velho (RO); Rondônia; Amazônia Ocidental; Western Amazon.; Gramínea Forrageira; Capim Brachiaria; Fósforo; Nitrogênio; Campo Experimental; Pastagem; Recuperação do Solo.; Rendimento; Composição Química; Fertilidade do Solo; Forage grasses; Urochloa brizantha; Nitrogen; Crop yield.; Chemical composition; Phosphorus.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/699887

Flooded rice in tropical Brazil.
Provedor de dados: 14
Autores: SANTOS, A. B. dos; SILVA, M. A. S. da; STONE, L. F.; HEINEMANN, A. B.
Flooded rice in tropical Brazil. Water management. Nitrogen management.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Arroz Irrigado; Oryza Sativa; Clima Tropical; Manejo de Água; Nitrogênio; Rice; Water management; Nitrogen; Climatic zones.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137156

Field and greenhouse tomato yields as functions of nitrogen dosis applied by hand or by drip fertigation system (2009).
Provedor de dados: 14
Autores: GUIMARÃES, T. G.; FONTES, P. C. R.; PEREIRA, P. R. G.; ALVAREZ, V. H.; MONNERAT, P. H.; PUIATTI, M.
bitstream/item/78075/1/p2009-016.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Fertilization; Fertirrigation.; Adubação; Fertirrigação; Nitrogênio; Tomate.; Nitrogen; Tomatoes.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/898279

Desenvolvimento inicial da amburana (Amburana cearensis) em áreas de cerrado degradado.
Provedor de dados: 14
Autores: DUBOC, E.; GUERRINI, I. A.
bitstream/item/89537/1/BP201363.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Amburana; Fertilization.; Adubação; Fósforo; Nitrogênio.; Phosphorus.; Nitrogen.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/966398

Fontes de nitrogenio para culturas irrigadas no Semi-Arido.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.
Verificou a viabilidade tecnica de novas fontes de nitrogenio. O delineamento experimental e em blocos ao acaso, com esquema fatorial formado de tres fontes de nitrogenio (nitrossulfocalcio, ureia compactada com gesso e ureia) e tres niveis (40, 80 e 120 kg/ha de N), com dois tratamentos adicionais (uma testemunha e ureia mais gesso isolados) e com quatro repeticoes.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Fertilization; Fertilidade; Irrigação; Nitrogênio; Solo; Irrigation; Nitrogen; Soil.
Ano: 1988
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132013

Girassol: nutricao mineral e adubacao.
Provedor de dados: 14
Autores: SFREDO, G. J.; CAMPO, R. J.; SARRUGE, J. R.
Exigencias nutricionais; Efeitos dos nutrientes essenciais; Calagem e adubacao.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Nutricao mineral; Brasil; Sunflower; Fertilization; Sulphur.; Adubação; Calagem; Boro; Cálcio; Cobre; Ferro; Enxofre; Fósforo; Girassol; Magnésio; Manganês; Nitrogênio; Molibdênio; Potássio; Zinco.; Brazil; Boron; Copper; Calcium; Liming; Magnesium; Manganese; Iron; Nutrition; Molybdenum; Nitrogen; Phosphorus; Potassium; Zinc.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445619

Manejo da diversidade genetica do milho e melhoramento participativo em comunidades agricolas nos estados do Rio de Janeiro e Espirito Santo.
Provedor de dados: 14
Autores: MACHADO, A. T.; MACHADO, C. T. de T.; COELHO, C. H. M.; ARCANJO, J. N.
Para identificar e selecionar genotipos adaptados as condicoes de pequenos agricultores do Espirito Santo e do Rio de Janeiro, foram avaliadas variedades de milho e realizados trabalhos de melhoramento participativo nas comunidades de Sol da Manha, em Seropedica (RJ); Vala Preta, em Mage (RJ) e Fortaleza, em Muqui (ES). Em 2000-2001, foram avaliadas dezesseis variedades e quatro ciclos de selecao da variedade Sol da Manha em Seropedica e Mage. Naquele ano, em Seropedica, foram conduzidos dois ensaios, um com baixo e outro com alto nível de N.Outras dezesseis variedades foram avaliadas em 2001-2002 em Sropedica e Miqui. O delineamento experimental foi o de blocos ao acaso, com tres repeticoes, utilizando em todos os experimentos. No primeiro ano em, Mage,...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Rio de Janeiro; Espirito Santo; Brasil; Variety; Maize.; Agricultura Familiar; Cerrado; Genética Vegetal; Nitrogênio; Melhoramento Genético Vegetal; Milho; Variedade; Zea Mays.; Brazil; Family farms; Plant breeding.; Nitrogen.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567110

Adubação química de cultivares de pimenta-do-reino (Piper nigrum L.) em latossolo amarelo da rodovia Transamazônica.
Provedor de dados: 14
Autores: VELOSO, C. A. C.; KATO, O. R.; ALBUQUERQUE, F. C. de; BRANDÃO, G. R.
bitstream/item/61692/1/Belem-ComTec1.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Pimenta-do-reino; Cultivar; Rodovia Transamazônica; Altamira; Marabá; Pará; Brasil; Black papper; Fertilizer; Variety; Yellow latosol; Production.; Adubação; Fósforo; Latossolo Amarelo; Nitrogênio; Piper Nigrum; Potássio; Produção.; Amazonia; Phosphorus; Nitrogen; Potassium.
Ano: 1988
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381259

Adubação do tomateiro rasteiro no submédio São Francisco.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.; COSTA, N. D.; SOARES, J. M.; PINTO, J. M.
Introdução; Solo; Absorção de nutrientes; Adubação e função dos nutrientes na colheita; Nitrogênio; Fósforo; Potássio; Cálcio; Micronutrientes; Conlusões; referências bibliográficas.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Macronutriente; Brasil; Submédio São Francisco; Sulphur; Micronutrients.; Adubação; Cálcio; Enxofre; Fósforo; Lycopersicon Esculentum; Magnésio; Nitrogênio; Potássio; Tomate.; Fertilizer application; Brazil; Calcium; Magnesium; Potassium; Phosphorus; Nitrogen; Tomatoes.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/510594

Resposta de variedades de milho a níveis e fontes de nitrogênio.
Provedor de dados: 14
Autores: MACHADO, A. T.; MACHADO, C. T. de T.; MIRANDA, G. V. de; COELHO, C. H. M.; GUIMARÃES, L. J. M.
RESUMO: A resposta de variedades de milho a nitrogênio (N) foi avaliada em cinco ensaios. Dois experimentos realizados em Coimbra (MG) e dois dos realizados em Seropédica (RJ) foram repetidos com 120 kg e 20 kg ha (elevado a -1) de N, sendo que o terceiro ensaio de Seropédica recebeu adubação verde. Cinco variedades locais, cinco experimentos e quinze melhoradas compuseram os ensaios, nos quais utilizou-se o delineamento experimental látice 5 x 5, com três repetições. O parâmetro de comparação foi o rendimento dos grãos. Em Seropédica, avaliou-se também o teor de N nos grãos e na planta. As variedades Caiano de Sobrália, Saracura, MC 3 e BR 5039 mostraram melhor resultado a baixos níveis de N, enquanto BR 106, Caiano de Sobrália, Eldorado e MC 9 foram as...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Eficiência; Maize; Efficiency; Translocation.; Melhoramento Vegetal; Milho; Nitrogênio; Variedade; Translocação; Zea Mays.; Plant breeding; Nutrient transport; Nitrogen; Varieties.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568126

Resposta da seringueira à aplicação de nitrogênio, fósforo e potássio em latossolo amarelo textura média, Ilha do Mosqueiro, Pará.
Provedor de dados: 14
Autores: VIEGAS, I. de J. M.; OLIVEIRA, R. F. de; CRUZ, E. de S.; AZEVEDO, C. E. de.
bitstream/item/32070/1/CPATU-BP125.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Desenvolvimento; Ilha do Mosqueiro; Belem; Pará; Brasil; Rubber tree; Yellow latosol; Developemt; Fertilizer.; Adubação; Fósforo; Latossolo Amarelo; Nitrogênio; Potássio; Seringueira.; Amazonia; Potassium.; Phosphorus; Nitrogen.
Ano: 1992
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381271

Limitações de fertilidade do solo na recuperação de pastagem degradada de capim colonião (Panicum maximum Jacq.) em Paragominas, na Amazônia Oriental.
Provedor de dados: 14
Autores: DIAS FILHO, M. B.; SERRÃO, E. A. S.
bitstream/item/31964/1/CPATU-BP87.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Pastagem degradada; Paragominas; Pará; Brasil; Leguminous; Fertility; Production; Degraded pasture; Dry matter; Fertilization.; Adubação; Calagem; Capim Colonião; Fertilidade; Enxofre; Fósforo; Matéria Seca; Leguminosa; Nitrogênio; Panicum Maximum; Produção; Solo.; Amazonia; Liming; Phosphorus; Nitrogen; Soil; Sulfur.
Ano: 1987
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/383651

Efeito das doses de nitrogênio sobre a produtividade de cana-de-açúcar em sucessão ao sorgo biomassa.
Provedor de dados: 14
Autores: MAY, A.; SANTOS, F. C. dos; SANTOS, M. de S. dos; SILVA, M. A. da; BARRETA, V. Z.
O objetivo do trabalho foi avaliar a produtividade da cana-de-açúcar transplantada em sistema de plantio direto após o cultivo do sorgo biomassa, em função de doses de nitrogênio aplicadas no plantio. O delineamento experimental utilizado foi em blocos ao acaso, com três repetições. Os tratamentos consistiram de quatro doses de nitrogênio (0, 20, 40 e 60 kg ha-1). A variedade de cana-de-açúcar utilizada foi a IAC SP 911099, transplantada em sistema de plantio direto após o cultivo do sorgo biomassa BRS 716. As parcelas experimentais foram compostas de quatro linhas de 12 m de comprimento, com espaçamento entrelinhas de 1,0 m. As variáveis avaliadas foram produtividade de colmos e brix na massa de caldo. Houve elevação da produtividade de colmos de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fertilidade do solo; Nitrogênio; Plantio direto; Soil fertility; Nitrogen.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1055940

Adubação nitrogenada e seu efeito na acidificação de um solo cultivado com cevada.
Provedor de dados: 14
Autores: COSER, T. R.; RAMOS, M. L. G.; RIBEIRO JÚNIOR, W. Q.; FIGUEIREDO, C. C. de; AMABILE, R. F.
bitstream/CPAC-2009/27734/1/p2006_62.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Adubação; Cevada; Fertilizante Nitrogenado; Hordeum Vulgare; Nitrogênio; Solo.; Barley; Fertilizer application; Nitrogen; Nitrogen fertilizers; Soil.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570197

Efeito do regime de irrigacao e da adubacao nitrogenada na producao de graos de milheto.
Provedor de dados: 14
Autores: SILVA, M. A. da; MILLAR, A. A.; COELHO, M. B.; OLIVEIRA, C. A. V.; BANDEIRA, R. E.; NASCIMENTO, T.
Neste trabalho estudou-se o efeito do nivel de agua no solo e da adubacao nitrogenada, e interacao entre estes fatores, sobre a producao e componentes de producao de graos de milheto. O delineamento do experimento foi em blocos casualizados, com arranjos em parcelas subdivididas (split-plot) com quatro repeticoes. Os tratamentos constaram de combinacao de quatro niveis de agua e quatro niveis de fertilizacao nitrogenada. O regime de irrigacao caracterizado em termos de aplicacao de agua, teor de umidade de solo, agua disponivel no solo e potencial matricial de agua no solo, aumentou a producao de graos. Observou-se que a eficiencia foi o que o mesmo foi superior a 40%, 18% e 8% a dos tratamentos com aplicacoes de 0,40 e 80 kg/ha de nitrogenio. O milheto e...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Penninsetum typhoides; Millet; Fertilizer applications; Irrigação; Adubação; Fertilidade; Milheto; Nitrogênio; Solo; Irrigation; Nitrogen; Soil.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133332

Liberacao de nitrogenio apos a incorporacao de adubos verdes cultivados durante o periodo da seca nos cerrados.
Provedor de dados: 14
Autores: BURLE, M. L.; SUHET, A. R.; RESCK, D. V. S.; PERES, J. R. R.; BOWEN, W. T.; PEREIRA, J.
bitstream/item/102944/1/pesq-49.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Cultivo; Epoca seca; Canavalia brasiliensis; Feijao bravo do Ceara; Mucuna aterrima; Sorgo BR 300; Cultivar; CPAC 1230; Cultivation.; Adubação Verde; Cajanus Cajan; Cerrado; Guandu; Leguminosa; Nitrogênio; Mucuna Preta; Reciclagem; Sorghum Bicolor; Stylosanthes Guianensis.; Tephrosia candida; Dry season; Green manures; Legumes; Recycling; Nitrogen; Varieties.
Ano: 1990
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549388

Adubação nitrogenada e inoculação de soja em solos de cerrados.
Provedor de dados: 14
Autores: VARGAS, M. A. T.; PERES, J. R. R.; SUHET, A. R.
A soja é considerada a maior fonte de proteínas para a alimentação animal e humana e seus subprodutos oferecem grande diversidade de emprego na indústria química. A expansão dessa cultura no Brasil acentou-se a partir de 1973, quando ocorreu uma grande elevação de seu preço no mercado internacional. A sua participação na pauta de exploração tem sido muito expressiva. Em 1979 contribuiu com cerca de 2 bilhões de dólares em divisas. Ocupa atualmente cerca de 20% de área cultivada no País. Nos cerrados, a partir de uma produção pouco expressiva, em 1975, foram colhidos na safra 1979/80 cerca de 1,9 milhão de toneladas de grãos de soja, equivalendo a 12,6% da produção do País. Essa produção representou um aumento de 66% em relação a safra anterior. Como o...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Adubação nitrogenada; Brasil; Cultivo; Fertilização; Fertilizer; Inoculation; Savanna; Soybean.; Adubação; Cerrado; Fertilizante Nitrogenado; Glycine Max; Grão; Inoculação; Nitrogênio; Produção; Rhizobium Japonicum; Solo.; Soja; Pennisetum; Inoculation methods; Nitrogen fertilizers; Nitrogen; Soil.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547538

Adubação orgânica e mineral na cultura do melão em um vertissolo do Submédio São Francisco.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.; POSSIDIO, E. L. de.
Determinacao de niveis adequados de adubacao N, P e K na cultura do melao e verificar sua resposta a aplicacao de materia organica.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Eldorado 300; Fertilização; Organic fertilizer; Manure; Melon.; Melão; Solo; Adubação; Cucumis Melo; Fósforo; Matéria Orgânica; Irrigação; Nitrogênio; Potássio; Vertissolo.; Irrigation; Melons; Nitrogen; Potassium; Phosphorus; Soil.
Ano: 1995
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132024

A fixação biológica do nitrogênio e o meio-ambiente.
Provedor de dados: 14
Autores: REIS JÚNIOR, F. B. dos; MENDES, I. de C.
bitstream/item/75762/1/art-015.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Solo; Fertilizante; Nitrogênio; Soil; Fertilizers; Nitrogen.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571741

Bloqueio pela uréia, da bulbificação precoce de seedlings de cebola (Allium cepa L.) na região de Manaus, AM.
Provedor de dados: 14
Autores: COLTRI, M. L.; MIKI, K.
Partindo-se da hipótese de que a aplicação de altos níveis de nitrogênio agem na planta como dia curto, plântulas de cebola (Allium cepa) foram submetidas a diferentes níveis desse elemento para se determinar um nível que oferecesse, as mudas, condições de serem transplantadas e produzir bulbos comercialmente viáveis.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Fertilizers application.; Adubação; Allium Cepa; Cebola; Muda; Nitrogênio.; Nitrogen; Seedlings.
Ano: 1987
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665123

Fertilizantes.
Provedor de dados: 14
Autores: MESSIAS, A. S.; SILVA, D. J.; FREIRE, F. J.; SILVA, M. C. L. da.
Nitrogenados; Fosfatados; Potassicos; Organicos; Micronutrientes; Fertilizantes simples e formulacoes comerciais; Epocas e modos de aplicacao de fertilizantes.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Micronutriente; Adubo; Corretivo; Fertilizante; Fósforo; Matéria Orgânica; Nitrogênio; Potássio; Solo; Fertilizer application; Nitrogen; Organic matter; Phosphorus; Potassium; Trace elements; Soil.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132544

Pesquisas em fertilidade do solo para o algodão cultivado no Cerrado do oeste da Bahia: safra 2006/2007.
Provedor de dados: 14
Autores: SANTOS, F. C. dos; ALBUQUERQUE FILHO, M. R. de; PEDROSA, M. B.; FERREIRA, G. B.; SILVA FILHO, J. L. da; SANTOS, J. B. dos; CARVALHO, M. da C. S.; BARBOSA, C. A. S.; FREIRE, R. M. M.
bitstream/CPAC-2009/28958/1/doc_208.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Adubação; Algodão; Fertilizante; Fósforo; Nitrogênio; Potássio; Solo.; Fertilizer application; Fertilizers; Cotton; Nitrogen; Phosphorus; Potassium; Soil.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572304

Adubação nitrogenada via água de irrigação para o tomateiro.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PINTO, J. M.; SOARES, J. M.; COSTA, N. D.; BRITO, L. T. de L.; SILVA, D. J.
Este trabalho tem como objetivo difundir os resultados de pesquisas referentes a doese e períodos de aplicação de nitrogênio (N), via água de irrigação, para cultura de tomate.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Adubação nitrogenada; Fertilizer applications.; Fertirrigação; Irrigação; Tomate.; Fertigation; Irrigation; Nitrogen; Tomatoes.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134059

A inoculacao da soja.
Provedor de dados: 14
Autores: HUNGRIA, M.; VARGAS, M. A. T.; CAMPO, R. J.
Como ocorre o processo de fixacao biologica do N2?; Quando e por quanto tempo a soja consegue fixar N2?; Por que e necessario inocular a soja em solos de primeiro cultivo?; Em area tradicionalmente cultivadas, vale a pena reinocular?; Os incrementos no rendimento obtidos pela reinoculacao compensam financeiramente?; Com deve ser o inoculante para a soja?; No campo, quais os principais fatores limitantes a fixacao biologica do N2?; Existem outros inoculantes biologicos para a cultura da soja?; Como saber mais sobre a fixacao biologica do N2?; Consideracoes finais.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Fixacao biologica do nitrogenio; Brasil; Parana; Inoculation; Biological fixation.; Bactéria; Bradyrhizobium Japonicum; Inoculação; Soja.; Bradyrhizobium elkanii; Brazil; Nitrogen; Soybeans.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459832

Efeito da adubacao e calagem sobre o crescimento de carvoeiro.
Provedor de dados: 14
Autores: MELO, J. T. de.
bitstream/CPAC-2009/24657/1/bolpd_76.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Carvoeiro; Planta nativa; Fertilizacao; Indigenous organisms.; Calcário; Cerrado; Fósforo; Nitrogênio; Potássio; Sclerolobium Paniculatum.; Reflorestamento; Fertilizer application; Limestone; Phosphorus; Nitrogen; Potassium; Reforestation.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559121

Produtividade do maracuja-doce em resposta a niveis de tensao de agua e fertirrigacao nitrogenada em solo de cerrado.
Provedor de dados: 14
Autores: FIGUEREDO, S. F.; AZEVEDO, J. A.; ANDRADE, L. M.; JUNQUEIRA, N. T. V.; ANDRADE, L. R. M.; GOMES, A. C.
bitstream/CPAC-2009/24370/1/p2003_19.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Fruit.; Água; Fruta; Maracujá; Manejo de Água; Irrigação; Nitrogênio; Passiflora Edulis; Rendimento; Solo.; Crop yield; Irrigation; Nitrogen; Soil; Water management.; Water.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566660

Adubos verdes: efeitos no rendimento e no nitrogenio do milho em plantio direto e convencional.
Provedor de dados: 14
Autores: CARVALHO, A. M. de; CARNEIRO, R. G.; AMABILE, R. F.; SPERA, S. T.; DAMASO, F. H. M.
bitstream/item/75916/1/bolpd-07.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Maize; Zero tillage; Crop sucession; Direct sowing; Dry watter; Espécies de cobertura; Green manure; No tillage; Production; Sucessão de cultivos; Sucessão de cultura.; Adubo Verde; Cerrado; Matéria Seca; Milho; Nitrogênio; Produção; Plantio Direto; Rendimento; Zea Mays.; Cover crops; Green manures; Crop yield; Nitrogen; Sequential cropping.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555406

Nutrição mineral.
Provedor de dados: 14
Autores: SILVA, D. J.
Introdução; Aspectos gerais da nutrição: nitrogênio, fósforo, potássio, cálcio, magnésio, enxofre, boro, cobre, ferro, manganês, zinco, molibdênio, cloro; Avaliação do estado nutricional; Amostragem e análise de solo; Amostragem e análise de planta; Calagem; Adubação: adubação de plantio, adubação de crescimento; adubação de produção; Irrigação e fertirrigação.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Videira; Nutrição mineral; Adubação de plantio; Uva; Solo; Nutrição; Calagem; Adubação; Irrigação; Fertirrigação; Grapes; Plant nutrition; Irrigation; Fertigation; Nitrogen.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1082017

Doses de NPK para formacao de seringais em solos de cerrado.
Provedor de dados: 14
Autores: PEREIRA, A. V.; PEREIRA, E. B. C.; FIALHO, J. de F.; JUNQUEIRA, N. T. V.; GOMES, A. C.
bitstream/CPAC-2009/24145/1/p2002_31.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Resposta de planta.; Adubação; Cerrado; Fertilizante; Fósforo; Hevea Brasiliensis; Nitrogênio; Potássio; Seringueira.; Fertilizer application; Fertilizers; Nitrogen; Plant response; Phosphorus; Potassium.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567452

Níveis e fontes de nitrogênio para milho em casa de vegetação.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.
bitstream/item/182094/1/FL-07850.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Casa de vegetacao; Fertilization; Greenhouse; Maise; Milho; Fertilidade; Nitrogênio; Solo; Zea Mays; Corn; Nitrogen; Soil.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132008

Nitrogênio total: Kjeldahl.
Provedor de dados: 14
Autores: BALIEIRO, F. de C.; ALVES, B. J. R.
O nitrogênio (N) é um nutriente de dinâmica intensa no solo e sua reserva nos solos tropicais encontra-se associada, principalmente, aos componentes da matéria orgânica, correspondendo a cerca de 95% do total existente. Alterações nas quantidades totais de N do solo podem revelar usos que implicam perdas ou ganhos de fertilidade, face à sua estreita relação com matéria orgânica do solo. O método de quantificação de N que será apresentado representa uma adaptação para solos tropicais do método de referência descrito por Bremner e Mulvaney (1982), sendo indicado para quantidades de solo contendo entre 0,5 mg e 2 mg de N.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Nitrogênio; Análise do Solo; Nitrogen; Soil analysis.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1107197

Efeito das determinações de nitrogênio ligado à fibra na estimativa dos nutrientes digestíveis totais - NDT - de gramíneas in natura.
Provedor de dados: 14
Autores: MEDEIROS, S. R. de; EUCLIDES, V. P. B.; LUZ, D. P.
O trabalho visa avaliar o efeito de não se considerar as frações de nitrogênio na estimativa dos nutrientes digestíveis totais, fórmula de Weiss, em gramíneas in natura: Brachiaria decumbens cv. Marandu e Panicum maximum Jacq cv. Tanzânia.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Marandu; Plant fibres.; Brachiaria Decumbens; Fibra; Nitrogênio; Panicum Maximum; Pastagem.; Tanzania; Pastures.; Nitrogen.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/326757

Desenvolvimento inicial da aroeirinha em áreas de Cerrado degradado.
Provedor de dados: 14
Autores: DUBOC, E.; GUERRINI, I. A.
RESUMO: A adição de nutrients pode aumentar a chance de sucesso dos plantios de recuperação de áreas degradadas, entretanto, existem poucos estudos sobre os efeitos da fertilização de espécies nativas do Bioma Cerrado. Este trabalho objetivou determinar o efeito sobre o crescimento e a sobrevivência de mudas de aroeirinha, na ausência de nitrogênio e a doses de 10, 20 e 40 kg/ha de N (uréia) e na ausência de fósforo e a doses de 10, 20 e 40 kg/ha de P (superfosfato triplo), plantadas em Latossolo Vermelho-Amarelo, ocupado com pastagem de Brachiaria decumbens. Foi avaliado o diâmetro do colo aos 4, 8 e 12 meses após o plantio e ao final do primeiro ano; o diâmetro de copa, a sobrevivência e a concentração foliar de nutrientes, Al e Na. A sobrevivência não...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Planta nativa; Indigenous organisms; Revegetation; Código Florestal.; Árvore; Aroeira; Cerrado; Fósforo; Nitrogênio; Revegetação.; Nitrogen; Phosphorus; Trees.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572283

Efeitos da inoculação de micorriza na produção de matéria orgânica de leguminosas arboreas e arbustivas.
Provedor de dados: 14
Autores: BLUM, E.
bitstream/item/57928/1/Doc40-p245-260.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Árvore leguminosa; Produção de matéria orgânica; Absorção de nitrogênio; Absorção de fósforo; Capitão Poço; Pará; Brasil.; Inoculação; Micorriza.; Amazonia; Absorption; Inoculation methods; Legumes; Mycorrhizae; Nitrogen; Organic matter; Phosphorus; Trees.; Soil.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394731

Manejo da adubacao nitrogenada para as principais culturas das areas irrigadas do tropico Semi-Arido.
Provedor de dados: 14
Autores: FARIA, C. M. B. de; PEREIRA, J. R.
Trata de estudar fontes e niveis de nitrogenio, nas culturas de tomate e milho, em areas irrigadas do tropico semi-arido. A analise de variancia dos dados de producao mostrou que houve influencia positiva dos niveis, sem contudo haver diferenca significativa entre as fontes de nitrogenio.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Adubacao nitrogenada; Lycopersicum esculentum; Tomato; Management; Fertilization; Fertilidade; Irrigação; Manejo; Milho; Tomate; Solo; Zea Mays; Corn; Irrigation; Nitrogen; Soil.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132005

Adubação nitrogenada em café decotado num latossolo de cerrado.
Provedor de dados: 14
Autores: SANZONOWICZ, C.; TOLEDO, P. M. dos R.; SAMPAIO, J. B. R.; GUERRA, A. F.; SILVA, D. T. M. da.
RESUMO: O nitrogênio (N) é um dos macronutrientes mais exigidos pelo cafeeiro. Sua utilização é necessaria para o cultivo nos solos de cerrado, pois estes não fornecem o nutriente em quantidades suficientes. Foi realizado um ensaio com o objetivo de estudar o efeito de fontes e doses de N no café decotado a 1,5 m de altura em 1997. O experimento foi instalado num Latossolo Vermelho na área experimental da Embrapa Cerrados, em Planaltina -DF. Os tratamentos foram constituídos de 0, 200, e 600 kg ha-¹ de N na forma de uréia parcelados em frações de 1/4, 1/2 e 3/4 no primeiro ano e em 3/4, 1/2 e 1/4 fornecidos no segundo ano e repetidos respectivamente, no terceiro e quarto anos. Foram também acrescidos dois tratamentos, 100 kg N ha-¹ na forma de uréia...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Coffee; Production.; Adubação; Coffea Arábica; Café; Cerrado; Fertilizante Nitrogenado; Nitrogênio; Produção; Solo.; Fertilizer application; Nitrogen fertilizers; Nitrogen; Soil.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568136

Produtividade do Cynodon spp cv. Tifton 85 sob diferentes tensões de água no solo e doses de nitrogênio.
Provedor de dados: 14
Autores: VILELA, L.; GUERRA, A. F.; LEITE, G. G.; MARCELINO, K. R. A.
RESUMO: Este experimento foi conduzido na Embrapa Cerrados, Planaltina (DF), no período de março de 2000 a janeiro de 2001 em um Latossolo Vermelho-Escuro, textura argilosa. O objetivo deste trabalho foi avaliar o efeito de tensões de água no solo (35, 60, 100 e 500 kPa) e quatro doses de nitrogênio (0, 30, 60, 120 kg/ha de N), exceto no primeiro corte (0, 15, 30 e 60 kg/ha de N), na produção e na taxa de acúmulo de forragem de Cynodon spp cv. Tifton 85 em períodos de crescimento correspondentes às estações de outono, inverno, primavera e verão. O delineamento experimental adotado foi o de blocos ao acaso, em parcelas divididas e três repetições. Nas parcelas, foram alocadas as tensões e, nas subparcelas, as doses de nitrogênio. A tensão de água no solo...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Capim Tifton 85; Eficiência; Tensão; Feed grasses; Feed crops; Efficiency.; Água; Cerrado; Forragem; Gramínea Forrageira; Nitrogênio; Rendimento; Solo.; Nitrogen; Soil water potential; Yields.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559757

Mineralização de nitrogênio e biomassa microbiana em solos de mata de galeria: efeito do gradiente topográfico.
Provedor de dados: 14
Autores: PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C.
RESUMO: A disponibilidade de nitrogênio (N) inorgânico para as plantas, geralmente, depende da taxa de mineralização da matéria orgânica. A biomassa microbiana, além de indicadora da qualidade do solo, está relacionada à disponibilização de nutrientes. Este trabalho objetivou determinar as taxas de mineralização líquida de N e o carbono da biomassa microbiana (CBM) em solos, em um gradiente topográfico de Mata de Galeria no Distrito Federal, por 12 meses. O gradiente comporta três comunidades florísticas: úmida (margem do córrego), intermediária e seca (borda da mata), nas quais a produção líquida de N inorgânico foi 81,5; 29,2 e 25,3 kg N ha (elevado a -1) ano (elevado a -1), respectivamente. A quantidade de N-NO3- disponível na comunidade úmida foi 0,69...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Microbial flora.; Biomassa; Cerrado; Nitrogênio; Nitrificação; Mineralização; Microbiologia do Solo; População Microbiana; Umidade do Solo.; Solo; Biomass; Mineralization; Nitrification; Nitrogen; Soil water content.; Soil biology; Soil.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568114

Influence de l'azote et du phosphore sur la croissance et la toxicité de Prorocentrum lima (Ehrenberg) Dodge
Provedor de dados: 5
Autores: Morlaix, Martine; Lassus, Patrick.
Very few attempts have been made in order to investigate the role of nutrients on cellular growth and toxin production in dinoflagellates associated with DSP (Diarrhetic Shellfish Poison). Some preliminary results are presented here, aiming at a better knowledge of inorganic nitrogen and organic phosphorus effects upon division rate and toxin content of Prorocentrum lima (PL2V spanish strain). Nitrogen have a positive effect on growth rate, up to a threshold value of 880muM.l-1. Above this threshold the rate decreases. There is no effect on toxin content since okadaic acid and DTX1 cell contents remain low (4.8 +/- 0.5 pg.cell.-1) and steady. Phosphorus effect upon division rate follows a non-linear relationship, whereas cellular toxic content is inversely...
Tipo: Text
Palavras-chave: Croissance; Toxicité; Concentration chimique; Division cellulaire; Production; Espagne; Phosphore; Azote; Europe; Nutriment; Milieu marin; Zone côtière; Ecotoxicologie; Pyrrophycophyta; Algae; Thallophyta; Okadaïque acide; Prorocentrum lima; Growth; Toxicity; Chemical concentration; Cell division; Production; Spain; Phosphorus; Nitrogen; Europe; Nutrient; Marine environment; Coastal zone; Ecotoxicology; Pyrrophycophyta; Algae; Thallophyta.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00133/24469/22483.pdf

Eutrophication: A new wine in an old bottle?
Provedor de dados: 5
Autores: Le Moal, Morgane; Gascuel-odoux, Chantal; Menesguen, Alain; Souchon, Yves; Etrillard, Claire; Levain, Alix; Moatar, Florentina; Pannard, Alexandrine; Souchu, Philippe; Lefebvre, Alain; Pinay, Gilles.
Eutrophication is one of the most common causes of water quality impairment of inland and marine waters. Its best-known manifestations are toxic cyanobacteria blooms in lakes and waterways and proliferations of green macro algae in coastal areas. The term eutrophication is used by both the scientific community and public policy-makers, and therefore has a myriad of definitions. The introduction by the public authorities of regulations to limit eutrophication is a source of tension and debate on the activities identified as contributing or having contributed decisively to these phenomena. Debates on the identification of the driving factors and risk levels of eutrophication, seeking to guide public policies, have led the ministries in charge of the...
Tipo: Text
Palavras-chave: Eutrophication; Nitrogen; Phosphorus; Algae bloom; Land-sea continuum; Diffuse pollution.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00456/56734/58551.pdf

Variations saisonnières de l'absorption de l'azote dans un système brassé peu profond (Manche occidentale)
Provedor de dados: 5
Autores: Maguer, Jf; Lecorre, P; Madec, C.
Seasonal changes in inorganic (NH4+; NO3-; NO2-) and organic (urea) nitrogen uptake were studied with N-15 as a tracer at a shallow station (depth: 22 m) in permanently well-mixed waters of the Western English Channel. Uptake of all the four nutrients was maximum in spring. Nitrate uptake accounted for a third of the total during spring phytoplankton growth, but decrease in summer. This decrease was related to the low ambient nitrate concentrations in early summer and to an inhibition of uptake by high concentrations in late summer. Ammonium was taken up in significant amounts from the beginning of spring (46 % of total uptake), increasing to 59 % in summer. In contrast with nitrate, ammonium concentrations during summer were sufficiently high to saturate...
Tipo: Text
Palavras-chave: Nitrogen; Uptake; Seasonal variations; Western English Channel.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20723/18360.pdf

Modelling nitrogen, primary production and oxygen in a Mediterranean lagoon. Impact of oysters farming and inputs from the watershed
Provedor de dados: 5
Autores: Chapelle, Annie; Menesguen, Alain; Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, Nabila; Vaquer, André; Millet, Bertrand.
An ecosystem model based on nitrogen cycling and oxygen has been developed for the Thau lagoon. It takes into account the specific features of this Mediterranean lagoon, a semi-confined system with watershed inputs and oyster farming. The ecosystem model uses currents calculated by a two-dimensional hydrodynamic model and integrated into a box model. This model is compared with a year survey data and used to estimate nitrogen and oxygen fluxes between the different ecosystem compartments. The yearly simulation shows that the ecosystem behavior is driven by meteorological forcing, especially rain which causes watershed inputs. These inputs trigger microphytoplankton growth, which is responsible for new primary production. During dry periods, nitrogen is...
Tipo: Text
Palavras-chave: Oxygen; Nitrogen; Oysters; Primary production; Box model; Lagoon ecosystem.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-725.pdf

Evaluation des proliferations d'algues vertes sur le littoral  breton en juin 1994
Provedor de dados: 5
Autores: Piriou, Jean-yves; Annezo, Jean-pierre.
During June 1994, 44 beaches with "green-tides" were identified along the coasts of Brittany. Compared to previous years, seaweed amounts accumulated on beaches receiving nitrogen inputs from granitic catchments can be considered stable, contrary to beaches exposed to nutrient fluxes originating from schistous catchments, where an increase of accumulations is observed. This late process can be explained by an increase of nitrogen loadings during periods of heavy rain (late spring 1994) on impervious basement rocks.
Tipo: Text
Palavras-chave: Rain; Nitrogen; Catchment; Green tide; Pluie; Azote; Bassin versant; Algue verte.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-1578.pdf

Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Janssens, Ivan A.; Verryckt, Lore; Brechet, Laetitia; Hartley, Iain P.; Stahl, Clement; Courtois, Elodie; Urbina, Ifigenia; Grau, Oriol; Sardans, Jordi; Peguero, Guille; Gargallo-garriga, Albert; Peñuelas, Josep; Vicca, Sara.
Theory states that tree growth in lowland tropical forests on old, weathered soils is limited by low phosphorous (P) availability. However, evidence for P limitation from nutrient manipulation experiments remains unclear, which raises the question whether trees are taking up added P. In French Guianese lowland rainforest, we measured changes in nitrogen (N) and P availability before and up to two months after N and P addition. We measured in soils with intact root systems and soils excluding roots and mycorrhizal fungi with root exclusion cylinders. When the root system was excluded, P addition increased P availability to a much greater extent and for a longer time than where the roots remained undisturbed. N dynamics were unaffected by root...
Tipo: Text
Palavras-chave: Tropical forest; Phosphorus; Nitrogen; Fertilization; Root system; Plant root simulator probes.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00589/70161/68163.pdf

Uptake of dissolved inorganic and organic nitrogen by the benthic toxic dinoflagellate Ostreopsis cf. ovata
Provedor de dados: 5
Autores: Jauzein, Cecile; Couet, Douglas; Blasco, Thierry; Lemee, Rodolphe.
Environmental factors that shape dynamics of benthic toxic blooms are largely unknown. In particular, for the toxic dinoflagellate Ostreopsis cf. ovata, the importance of the availability of nutrients and the contribution of the inorganic and organic pools to growth need to be quantified in marine coastal environments. The present study aimed at characterizing N-uptake of dissolved inorganic and organic sources by O. cf. ovata cells, using the 15N-labelling technique. Experiments were conducted taking into account potential interactions between nutrient uptake systems as well as variations with the diel cycle. Uptake abilities of O. cf. ovata were parameterized for ammonium (NH4+), nitrate (NO3−) and N-urea, from the estimation of kinetic and inhibition...
Tipo: Text
Palavras-chave: Uptake; Nitrogen; Dinoflagellate; Ostreopsis; Kinetics; Interactions.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00382/49368/49840.pdf

Contribution of several nitrogen sources to growth of Alexandrium catenella during blooms in Thau lagoon, southern France
Provedor de dados: 5
Autores: Collos, Y; Vaquer, A; Laabir, M; Abadie, Eric; Laugier, Thierry; Pastoureaud, Annie; Souchu, Philippe.
A monitoring program with a weekly sampling frequency over a 15-month period indicates that urea concentrations above a certain threshold level may trigger the blooms of Alexandrium catenella in Thau lagoon. However, urea concentrations were also sometimes related to ammonium and dissolved organic nitrogen concentrations, indicating that the role of urea may not be a direct one. An original approach is used to assess the relative contribution of several nitrogen sources (nitrate, nitrite, ammonium, urea) to growth of A. catenella by comparing nitrogen uptake rates to nitrogen-based growth rates estimated from dilution experiments during four blooms over a 4-year period (2001-2004) in Thau lagoon. Nitrate and nitrite contributed 0.1-14% and 0.1-5%...
Tipo: Text
Palavras-chave: Uptake kinetics; Ammonium; Urea; Growth; Nitrogen; HAB; Alexandrium catenella.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6454.pdf

Comparative proteomics reveals proteins impacted by nitrogen deprivation in wild-type and high lipid-accumulating mutant strains of Tisochrysis lutea
Provedor de dados: 5
Autores: Garnier, Matthieu; Carrier, Gregory; Rogniaux, Helene; Nicolau, Elodie; Bougaran, Gael; Saint-jean, Bruno; Cadoret, Jean-paul.
Understanding microalgal lipid accumulation under nitrogen starvation is of major interest for biomass feedstock, food and biofuel production. Using a domesticated oleaginous algae Tisochrysis lutea, we performed the first comparative proteomic analysis on the wild type strain and a selected lipid over-accumulating mutant. 2-DE analysis was made on these strains cultured in two metabolic conditions, with and without nitrogen deprivation, which revealed significant differences in proteomes according to both strain and nitrogen availability. Mass spectrometry allowed us to identify 37 proteins that were differentially expressed between the two strains, and 17 proteins regulated by nitrogen starvation concomitantly with lipid accumulation. The proteins...
Tipo: Text
Palavras-chave: Microalgae; Biotechnology; Lipid; Nitrogen; Proteomic; Selection.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00179/29012/27470.pdf

The use of high rate algal ponds for the treatment of marine effluent from a recirculating fish rearing system
Provedor de dados: 5
Autores: Pagand, Pascal; Blancheton, Jean-paul; Lemoalle, J; Casellas, C.
A high rate algal pond (HRAP) system was used to treat effluent from a recirculating sea water aquaculture system in southern France. Dicentrarchus labrax L. were farmed at a high density, with effluents containing an average of 10 mg L-1 dissolved inorganic nitrogen (DIN) and 1.3 mg L-1 reactive phosphorus (RP). On a yearly basis, the algal pond removed 59% of the dissolved nitrogen and 56% of the phosphorus input, which was converted into 3.3 kg DW m(-2) algae. Green macroalgae were dominant throughout the year and the algal biomass mirrored the seasonal changes in daily irradiance and temperature. This first year study supports the possibility of treating marine aquaculture wastes using HPAPs, although conditions will have to be found to mitigate the...
Tipo: Text
Palavras-chave: Nitrogen; Biofilters; Irradiance; Temperature; Photosynthesis; Growth; Culture; Chlorophyta; Nutrient Removal.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-515.pdf

Bilan azoté des flux tidaux d'un marais salé à végétation halophyte
Provedor de dados: 5
Autores: Silva, Celine; Raillard, Marieke; Bodoy, Alain; Hussenot, Jerome.
In spring 2001, during a complete tidal cycle, nitrogen fluxes between the sea and the salt marsh were calculated. The marsh (1198 m2) covered in 75 % by halophytes, with 46 % by the sea purslane, Halimione portulacoides. The nitrogen balance shows that the salt marsh imports nitrogen micro-particules (2,09 g) by sedimentation, exports dissolved nitrogen (4,13 g), and that the macro-element part (-1,02 g in fauna and vegetable refuse) in the global mass balance (3,06 g) is not unimportant. Nitrogen fluxes are mainly under inorganic form for the incoming flux (mainly NO3), and under organic form for the outgoing flux. The halophyte vegetation of this marsh seems to play thus a dominating role in the tidal nitrogen exchanges, by a mechanical action on the...
Tipo: Text
Palavras-chave: Marais salé; Halophytes; Azote; Bilan de masse; Halimione portulacoides; Salicornes; Salt marsh; Halophytes; Nitrogen; Mass balance; Halimione portulacoides; Sea purslane; Sampshire.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00045/15597/13000.pdf

Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. I. Azote et populations bactériennes en fonction de certains paramètres du milieu
Provedor de dados: 5
Autores: Chamroux, S.; Boucher, G.
Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters al­lowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of or­ganic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of...
Tipo: Text
Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf

High-rate algal pond treatment for water reuse in an integrated marine fish recirculating system: effect on water quality and sea bass growth
Provedor de dados: 5
Autores: Deviller, Genevieve; Aliaume, Catherine; Franco, Miguel; Casellas, Claude; Blancheton, Jean-paul.
A high-rate algae pond (HRAP) was tested as a second loop of water treatment in a recirculating fish rearing system to reduce water requirements and nutrient discharge levels. Three duplicated groups of sea bass (mean initial body weight 3 5 I I g) were reared under different system conditions (flow-through system, recirculating system and recirculating system with HRAP) for I year. Fish survival rate was higher in the system with HRAP, and their mean body weight was statistically higher (p&lt;0.05) during the month of maximal climatic conditions for algae photosynthesis. After 266 days of experiment, mean fish weight was significantly higher (p&lt;0.05) in the flow-through system than in the recirculating systems. Final fish weight was 15% higher in the...
Tipo: Text
Palavras-chave: Sustainability; Phosphorus; Nitrogen; Fish growth; Recirculation; High rate algae pond.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-620.pdf

Biogeochemical aspects of bottom anoxia in a Mediterranean lagoon (Thau, France)
Provedor de dados: 5
Autores: Souchu, Philippe; Gasc, Anne; Collos, Y; Vaquer, A; Tournier, Henri; Bibent, B; Deslous-paoli, Jean-marc.
Physical and chemical characteristics (temperature, salinity, dissolved oxygen), nutrients [dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and silicate], dissolved organic nitrogen (DON) and phosphorus and particulate matter [particulate organic carbon (POC) and nitrogen (PON) and chlorophyll a] were measured at a station located in the deepest part of the Thau lagoon (8.5 m), France, during a 10 d period of bottom anoxia in summer 1994. The upper 8 cm of sediment were also analyzed for ammonium (NH(4)(+)) and SRP concentrations in the porewater. The study period was characterized by mean wind speed under 4 m s(-1) which induced an increase of surface temperature from 18 to 29 degrees C with the formation of a thermocline. The...
Tipo: Text
Palavras-chave: Anoxia; Nitrogen; Phosphorus; Eutrophication; Thau lagoon; Mediterranean Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00070/18142/15694.pdf

Variabilité hydrologique et biologique du golfe du Lion. I. Transports en azote et productivité potentielle
Provedor de dados: 5
Autores: Conan, P; Pujo-pay, M; Raimbault, P; Leveau, M.
A monthly time-series of the seasonal evolution of the North Mediterranean Current (NMC) and of nitrogen flux across a transect (5 degrees 12'5 E between 43 degrees 10'N and 42 degrees 50'N) at the entrance of the Gulf of Lions was carried out over two years. The NMC exhibited two distinct structures: a winter structure (from November to May) characterised by strong mesoscale and interannual variations in which the current was 20 to 30 km width, about 400 m depth and velocity scaled between 5 and more than 40 cm s(-1); and a summer structure (from May to November) which was less sensitive to mesoscale variations but showing large interannual variability. The current was located more offshore, was wider and shallower than the one in winter and velocity...
Tipo: Text
Palavras-chave: Hydrologie; Variabilité à méso-échelle; Azote; Flux de matière; Bilan; Hydrology; Mesoscale variability; Nitrogen; Flux; Budget.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43638/43249.pdf

Trophic dynamics of scleractinian corals: stable isotope evidence
Provedor de dados: 5
Autores: Tremblay, Pascale; Maguer, Jean-francois; Grover, Renaud; Ferrier-pages, Christine.
Reef-building corals form symbioses with dinoflagellates from the diverse genus Symbiodinium. This symbiotic association has developed adaptations to acquire and share nutrients, which are essential for its survival and growth in nutrient-poor tropical waters. The host is thus able to prey on a wide range of organic food sources (heterotrophic nutrition) whereas the symbionts acquire most of the inorganic nutrients (autotrophic nutrition). However, nutrient fluxes between the two partners remain unclear, especially concerning heterotrophically acquired carbon and nitrogen. We combined physiological measurements and pulse-chase isotopic labeling of heterotrophic carbon and nitrogen, as well as autotrophic carbon to track nutrient fluxes in two coral...
Tipo: Text
Palavras-chave: Autotrophy; Carbon; Heterotrophy; Irradiance; Isotopic labeling; Nitrogen; Stylophora pistillata; Symbiodinium; Symbiosis; Turbinaria reniformis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00270/38145/73160.pdf

Comparison of two methods for evaluating waste of a flow through trout farm
Provedor de dados: 5
Autores: Roque D'Orbcastel, Emmanuelle; Blancheton, Jean-paul; Boujard, Thierry; Aubin, Joel; Moutounet, Yves; Przybyla, Cyrille; Belaud, Alain.
European water legislation enforces increasingly restrictive measures with regards to reduction of water consumption and waste emission in order to minimise the potential environmental impact of the agro industry sector. Fish farms are particularly concerned, but legislation covering effluent discharge varies significantly from country to country. However, recommendations and directives from institutional, national or regional bodies suggest the enforcement of increasingly strict waste reduction measures and the development of waste treatment. Before treatment, it is necessary to evaluate waste production in terms of composition and quantity. The waste quantification methods used today for fish culture systems are either based on direct measurements of...
Tipo: Text
Palavras-chave: Phosphorus; Nitrogen; Suspended solids; Trout farm; Waste.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6822.pdf

Spatio-temporal variation in diet may affect condition and abundance of juvenile European hake in the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Ferraton, Franck; Harmelin Vivien, Mireille; Mellon-duval, Capucine; Souplet, Arnauld.
Variations in space and time of juvenile hake diet (5 to 19 cm total length, TL) were investigated in the Gulf of Lions (NW Mediterranean) and related to variation in C and N stable isotope ratios, condition and abundance. Crustaceans (mysids and euphausiids) dominated the diet of the smallest juvenile hake (5 to 9 cm. TL), and fishes (sardines and anchovies) of the largest juveniles (15 to 19 cm TL). The transition from a crustacean- to a fish-based diet occurred in medium-sized juveniles (10 to 14 cm TL), which preyed on both crustaceans and fishes (gobiids). These juveniles preyed on fishes when living in shallow waters (30 to 50 m), and crustaceans when located in deep waters (70 to 150 m). Although hake diet did not change over time in shallow waters...
Tipo: Text
Palavras-chave: Recruitment; Relative condition factor; Nitrogen; Carbon; Stable isotopes; Stomach contents; Merluccius merluccius.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2627.pdf

Modélisation des cycles de l'azote et du phosphore dans les sédiments d'une lagune soumise à une exploitation conchylicole
Provedor de dados: 5
Autores: Chapelle, Annie; Mesnage, Valérie; Mazouni, Nabila; Deslous-paoli, Jean-marc; Picot, Bernadette.
A simulation of nitrogen and phosphorus exchanges for the sediment-water interface is presented, The aim of the sttudy is to understand the dynamic behaviour of an eutrophie coastal lagoon (Thau, France), ln situ experiments were performed to estimate the different pools of nitrogen and phosphorus in the water column and in the sediment. The diffusive fluxes between them were also estimated. A numerical mode1, simulating nitrogen and phosphorus cycles, was developed and calibrated with data recorded .at two seasons (winter and summer). This study leads to the conclusion that is necessary to know the different pools of nitrogen and phosphorus in order to estimate which fraction is bioavailable and the rate of nutrient exchange between sediment and water. It...
Tipo: Text
Palavras-chave: Modèle; Phosphore; Azote; Sédiment; Ecosystème conchylicole; Modelling; Phosphorus; Nitrogen; Sediment; Shellfish ecosystem.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00039/15026/12360.pdf

Inter and intra-specific growth and domoic acid production in relation to nutrient ratios and concentrations in Pseudo-nitzschia : phosphate an important factor
Provedor de dados: 5
Autores: Lema, Anais Kimberley; Latimier, Marie; Nezan, Elisabeth; Fauchot, Juliette; Le Gac, Mickael.
The factors responsible for inducing the synthesis of toxins and responses from toxic phytoplankton blooms remain unclear. In this study we compare the influence of genotypic (at both the intra and interspecific levels) and environmental factors (nutrient concentration and ratio) on growth (in terms of cell densities) and domoic acid (DA) production in three Pseudo-nitzschia species: P. australis, P.pungens and P.fradulenta. A strong phosphate effect was detected. More precisely, a low initial concentration in phosphate, even at high initial nitrogen and silicate concentrations, induced the highest DA concentrations and the lowest cell densities in all strains/species studied. In contrast, a low initial concentration of nitrogen and silicate combined, with...
Tipo: Text
Palavras-chave: Pseudo-nitzschia strains; Domoic acid; Ratio; Phosphate; Nitrogen.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00377/48849/49397.pdf

Particulate Matter in Mangrove Forests and Seagrass Beds as a Nitrogen Source in Tropical Coastal Ecosystems
Provedor de dados: 5
Autores: Gillis, Lucy G.; Bouma, Tjeerd J.; Cathalot, Cecile; Ziegler, Alan D.; Herman, Peter M.
We show in laboratory and field investigations that in the short-term seagrasses obtain most of their required nitrogen from the degradation of seagrass leaves, rather than degradation of leaves exported from adjacent mangroves. Mangrove forests at our Thailand site retain the majority of their nutrients, and therefore potentially buffer seagrasses from nutrients.
Tipo: Text
Palavras-chave: Buffering; Mangrove forests; Nitrogen; Outwelling; Particulate organic material; Seagrass beds.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00266/37731/42021.pdf

Isotopic composition and speciation of sedimentary nitrogen and carbon in the Okinawa Trough over the past 30 ka
Provedor de dados: 5
Autores: Zheng, Li-wei; Hsiao, Silver Sung-yun; Ding, Xiao-dong; Li, Dawei; Chang, Yuan-pin; Kao, Shuh-ji.
Total organic carbon to total nitrogen ratios (C/N) and their isotopic compositions (δ13CTOC and δ15NTN) are oft-applied proxies to discern terrigenous from marine-sourced organics and to unravel ancient environmental information. In high depositional Asian marginal seas, the inclusion of N-bearing minerals in the bulk sediment dilutes or masks signals sought after in δ15N and δ13C analyses, thus leading to incorrect and even contradictory interpretations. We used KOH-KOBr to separate operationally defined total organic matter into oxidizable (labile) and residual fractions for content and isotope measurements. In a sediment core in the Okinawa Trough, significant amounts of carbon and nitrogen existed in the residual phase, in which the C/N ratio was ~9,...
Tipo: Text
Palavras-chave: Carbon; Nitrogen; Isotope; Okinawa Trough; Sediment; Total organic carbon.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00295/40584/39503.pdf

Betaine lipid and neutral lipid production under nitrogen or phosphorus limitation in the marine microalga Tisochrysis lutea (Haptophyta)
Provedor de dados: 5
Autores: Huang, Bing; Marchand, Justine; Thiriet-rupert, Stanislas; Carrier, Gregory; Saint-jean, Bruno; Lukomska, Ewa; Moreau, Brigitte; Morant-manceau, Annick; Bougaran, Gael; Mimouni, Virginie.
Nitrogen (N) and phosphorus (P) limitations induce neutral lipid accumulation and membrane lipid remodeling in the domesticated oleaginous microalga Tisochrysis lutea. This study compared growth, photosynthetic activity, biochemical and transcriptional responses of T. lutea throughout batch cultures under N or P limitation compared with non-limiting nutrient condition (NP). The results show that, under N limitation, the breakdown and re-use of cellular N-containing compounds contributed to carbohydrates and further triacylglycerol (TAG) accumulation, where the accumulation of docosahexaenoic acid (DHA) in neutral lipids might mainly be derived from the recycling of membrane polar lipids. Conversely, P limitation did not hinder the photosynthetic capacity;...
Tipo: Text
Palavras-chave: Tisochrysis lutea; Phosphorus; Nitrogen; Lipid remodeling; Betaine lipid; Polyunsaturated fatty acid.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00492/60409/64776.pdf

Role of tidal pumping on nutrient cycling in a temperate lagoon (Arcachon Bay, France)
Provedor de dados: 5
Autores: Deborde, J; Anschutz, P; Auby, Isabelle; Gle, C; Commarieu, M; Maurer, Daniele; Lecroart, P; Abril, G.
The hypothesis of nutrient-rich pore-waters seeping at low tide through sediments to channel waters, which drain tidal flats during ebb, was evaluated in the Arcachon lagoon. The back of the bay is affected by freshwater inputs and underground freshwater discharges. The upper part of tidal flat consists of permeable sandy sediments, which are covered by a muddy sediment layer on the lower part. Permeable sediments outcrop in the bed of channel web. Surface water chemistry and early diagenesis processes in sediment were estimated by collecting channel web waters and cores on a tidal flat and in channels at different seasons and time scales. Waters from tidal creeks are under-oxygenated, and enriched in reduced solutes. Muddy sediments showed evidences of...
Tipo: Text
Palavras-chave: Arcachon Bay; Pore waters seeping; Nitrogen; Phosphorus; Organic matter mineralization; Tidal creek water; Tidal pump.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/2008/publication-3927.pdf

Marée verte en martinique
Provedor de dados: 5
Autores: Piriou, Jean-yves.
Few years ago, proliferations of the green seaweed Enteromorpha have been noticed on sorne beaches of the southem coast of Martinique (American French Island). A study, in the year 1992, shows that Enteromorpha has a seasonal development, that nitrogen is the limiting factor, and that its principal feeding cornes from urban discharges thrown away directly into growing areas.
Tipo: Text
Palavras-chave: Azote; Enteromorpha; Martinique; Proliférations; Rejets urbains; Nitrogen; Enteromorpha; Martinique; Proliferations; Urban discharges.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00132/24277/22275.pdf

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis
Provedor de dados: 5
Autores: Guazzelli Gonzalez, Julio; Ménard, Frédéric; Le Loc'H, François; Agrelli De Andrade, Humber; Pontes Viana, Andréa; Ferreira, Valdimere; Frédou, Flávia Lucena; Lira, Alex Souza; Munaron, Jean-marie; Frédou, Thierry.
We investigated the trophic niches and the resource partitioning of two snook species, the common (Centropomus undecimalis) and the fat snook (C. parallelus), in four tropical estuaries of the northeastern Brazil, using stable isotope analyses of carbon (δ13C) and nitrogen (δ15N). Fish specimens, mainly juveniles, basal resources and a primary consumer were collected in 2015 during dry and rainy seasons in all estuaries, which exhibited differences in system size, geomorphologic shapes, levels of sea access and anthropic pressures. Potential effect of factors like fish body length, estuary and seasonality on isotope ratios were investigated. Positive relationships between the size of fish and δ15N values were found, regardless the species. Our results...
Tipo: Text
Palavras-chave: Brackish water fish; Trophic relationships; Carbon; Nitrogen; Centropomus.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00506/61767/65745.pdf

Use of a lipid rich strain reveals mechanisms of nitrogen limitation and carbon partitioning in the haptophyte Tisochrysis lutea
Provedor de dados: 5
Autores: Garnier, Matthieu; Bougaran, Gael; Pavlovic, Marija; Berard, Jean-baptiste; Carrier, Gregory; Charrier, Aurelie; Le Grand, Fabienne; Lukomska, Ewa; Rouxel, Catherine; Schreiber, Nathalie; Cadoret, Jean-paul; Rogniaux, Helene; Saint-jean, Bruno.
Haptophytes are a diverse monophyletic group with a worldwide distribution, known to be significantly involved in global climate regulation in their role as a carbon sink. Because nitrogen is a major limiting macronutrient for phytoplankton in oceans and for cultures of microalgae, understanding the involvement of nitrogen availability in haptophyte carbon partitioning is of global and biotechnological importance. Here, we made an ecophysiological study coupled with comprehensive large scale proteomic analysis to examine differences of behavior in reaction to nitrogen availability changes between a wild type strain of Tisochrysis lutea (WTc1) and a mutant strain (2Xc1) known to accumulate more storage lipids. Strains were grown in chemostats and studied...
Tipo: Text
Palavras-chave: Algae; Isochrysis; Lipids; Nitrogen; Reverse genomic: proteomic.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00356/46702/46904.pdf

Précontrat de baie "golfe du Morbihan" Mesures de flux nutritifs et inventaire d'algues vertes en 1995
Provedor de dados: 5
Autores: Piriou, Jean-yves; Chapron, Victorien; Annezo, Jean-pierre.
The gulf of Morbihan, without manifesting any pronounced signs of eutrophication, has, in 1995, three sites of green algae proliferation: the Auray river estuary, the branches of the Vannes and Séné estuary, as well as the outlet of the Noyalo's estuary. They are also the three sectors of the gulf that receive the most nutrient salts, in particular, nitrogen, which is a determining factor in the development of nitrophilic green algae (Ménesguen and Piriou 1995). During spring the nitrogen seems to come as much from urban sources (Vannes, Auray) as from agricultural sources coming from the northern catchment areas of the gulf.
Tipo: Text
Palavras-chave: Morbihan gulf; Eutrophication; Nitrogen; Green seaweed; Green algae; Eutrophisation; Golfe du Morbihan; Azote; Algues vertes.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-2084.pdf

Solid-state solubilities of grain -growth inhibitors in WC-Co and WC-MC-Co hardmetals
Provedor de dados: 5
Autores: Lauter, Lukas; Hochenauer, Roman; Buchegger, Christoph; Bohn, Marcel; Lengauer, Walter.
The solubilities of the most common grain -growth inhibitors (GGIs) Cr, V, Ta, Mo, Nb, Zr and certain combinations there of in the binder phase of WC-Co hardmetals as well as hardmetals of the type WCTiC-TiN-TaC-NbC-Co containing an fcc MC carbide (or carbonitride) phase "MC"("WC-MC-Co" hardmetals) were analysed by means of WDS-EPMA. The carbon potential of the binder phase was fixed at its highest and lowest maxima by the presence of either graphite or eta (M6C) phases. In case of low-carbon hardmetals the composition of M6C, and in the MC-containing hardmetals the composition of the MC phase, was analysed. Two types of solubilities were determined. The first type was measured after controlled cool-down from liquid-phase sintering temperature and...
Tipo: Text
Palavras-chave: Hardmetal; Cemented carbides; Grain-growth inhibitor; Nitrogen; Binder phase; Solubility; EPMA.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00332/44332/44155.pdf

Nitrogen and phosphorus limitations induce carbon partitioning and membrane lipid remodelling in the marine diatom Phaeodactylum tricornutum
Provedor de dados: 5
Autores: Huang, Bing; Marchand, Justine; Blanckaert, Vincent; Lukomska, Ewa; Ulmann, Lionel; Wielgosz-collin, Gaëtane; Rabesaotra, Vony; Moreau, Brigitte; Bougaran, Gael; Mimouni, Virginie; Morant-manceau, Annick.
Nitrogen (N) and phosphorus (P) limitations induce triacylglycerol (TAG) accumulation and membrane lipid remodelling in the marine diatom Phaeodactylum tricornutum. However, a clear understanding of the metabolic reorientation is still lacking. Carbon partitioning is of great interest because this microalga produces various highly valuable molecules such as lipids and polyunsaturated fatty acids. This study compared growth, photosynthetic activity, biochemical and transcriptional responses of P. tricornutum throughout batch culture under N or P limitation. The integrated results show that the photosynthetic intensity was greatly reduced under N or P limitation. Under N limitation, the degradation and re-use of cellular N-containing compounds contributed to...
Tipo: Text
Palavras-chave: Betaine lipid; Lipid remodelling; Microalga; Nitrogen; Phosphorus; Polyunsaturated fatty acid.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00491/60249/63861.pdf

Dissolved inorganic nitrogen uptake by intertidal microphytobenthos: nutrient concentrations, light availability and migration
Provedor de dados: 5
Autores: Longphuirt, Sorcha Ni; Lim, Jae-hyun; Leynaert, Aude; Claquin, Pascal; Choy, Eun-jung; Kang, Chang Keun; An, Shu.
The importance of intertidal flats as areas of nitrogen filtering has become increasingly apparent in recent times. TO understand fully the cycling of this nutrient. in these areas of high metabolic activity, it is necessary to elucidate the influence of microphytobenthos (MPB) on stocks of ammonium and nitrate in surface areas. In this study, we aimed to quantity nitrogen uptake and relate it to the in Situ concentrations and environmental conditions to which MPB are exposed. In an estuarine system on the Korean Peninsula, we conducted kinetic experiments using N-15 stable isotopes and core sampling over the tidal cycle to determine the temporal evolution of porewater nutrient concentrations and the migration of MPB. The results revealed a range of K-s...
Tipo: Text
Palavras-chave: N 15 stable isotope; Porewater; Microphytobenthos; Kinetic; Nitrogen.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6622.pdf

Absorption et régénération de l'azote dans le système brassé de la Manche : productions nouvelle et régénérée
Provedor de dados: 5
Autores: Maguer, Jf; L'Helguen, S; Madec, C; Le Corre, P.
Nitrate and ammonium uptake rates were measured in spring and summer in deep and shallow well-mixed waters of the English Channel during different cruises between 1986 and 1994. In the deep waters, nitrate uptake was relatively low during phytoplankton development and ammonium uptake represented more than 70 % of the total uptake irrespective of the season. In the shallow waters, nitrate uptake during spring phytoplankton growth was high and represented about 75 % of the total uptake. Ammonium uptake became substantial towards the end of spring and summer. The high contribution of ammonium to the nitrogenous nutrition of phytoplankton over the whole of the well-mixed waters is related to a high rate of recycling of nitrogen in the water column. Ammonium...
Tipo: Text
Palavras-chave: Azote; Absorption; Régénération; Productions nouvelle et régénérée; Manche; Nitrogen; Uptake; Regeneration; New and regenerated productions; English Channel.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43644/43246.pdf

Origine, devenir et contrôle de la matière particulaire dans les élevages de poissons marins en système recyclé
Provedor de dados: 5
Autores: Franco, Miguel.
The particulate matter plays an essential role in the functioning of recirculating aquaculture systems (RAS). Rich in organic substances, it provides ideal conditions for the bacterial development, which contribute to its mineralization. The understanding of interactions between the bio-geochemical cycles of carbon and nitrogen in these processes is necessary to define an effective and adapted management of aquaculture facilities.  A methodology using natural stable isotopes (13C and 15N) and elemental carbon and nitrogen analysis on particulate matter, allows to identify its sources and to quantify its fluxes. Applying this methodology, we found an enrichment of 13C in dorsal muscle of reared fish and non differences of 13C in fish liver compared to the...
Tipo: Text
Palavras-chave: Nitrogen; Carbon; Isotopes; Organic matter; Particulate matter; Dicentrarchus labrax; Seabass; Recirculating systems; Aquaculture; Azote; Carbone; Isotopes; Matière organique; Matière particulaire; Dicentrarchus labrax; Bar; Système de recirculation; Aquaculture.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/these-322.pdf

Effect of water exchange on effluent and sediment characteristics and on partial nitrogen budget in semi-intensive shrimp ponds in New Caledonia
Provedor de dados: 5
Autores: Lemonnier, Hugues; Faninoz, Sebastien.
An experiment was conducted in six earthen ponds with 20 shrimps m(-2) Litopenaeus stylirostris (Stimpson) during the warm season in New Caledonia to study the dynamics of wastes in relation with water exchange rate (WER). The nitrogen budget was established, taking into account the different forms of nitrogen in the water, sediment, feed and shrimp. Data from a wide range of treatments applied in unreplicated ponds were treated using regression analysis to establish the relationship between WER and partial nitrogen budget, sediment characteristics and shrimp performance. To compare effluent quality between treatments during the season, data were analysed using the non-parametric sign test. The water outflow was characterized by a decrease in the...
Tipo: Text
Palavras-chave: New Caledonia; Nitrogen; Water exchange; Shrimp; Sediment quality; Effluent.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1811.pdf

Abattement de l'azote par le marais côtier de Kervigen et potentiel breton
Provedor de dados: 5
Autores: Piriou, Jean-yves; Coic, Daniel; Merceron, Michel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered by reeds. An experiment was there carried out to assess the nitrogen flux depletion of a small stream, the Kerharo. That one has a 45 km 2 mostly agricultural drainage basin. Due to its nitrate loadings to the next sandy beach, it feeds a green algae (Ulva) proliferation. In order to control its nitrogen fluxes, the stream was partly diverted through a part of the marsh (9 ha), before it was allowed to go back to the main bed. Thus a collapsible weir was set up during several springs and summers, i.e. the growing period of Ulva. The nitrate stripping off the going through flux is within a 30 to 90 % range,that is important (175 kg N03...
Tipo: Text
Palavras-chave: Algae; Nitrogen; Ulva; Nitrate depletion; Costal marsh; Algue; Azote; Ulva; Abattement de nitrate; Marais côtier.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-64.pdf

Eléments azotés de la colonne d'eau et de l'interface eau-sédiment du bassin de Marennes-Oléron : influence des cultures d'huîtres
Provedor de dados: 5
Autores: Feuillet-girard, Michelle; Heral, Maurice; Sornin, Jean-marc; Deslous-paoli, Jean-marc; Robert, Jean-michel; Mornet, Francoise; Razet, Daniel.
The respective influences of the sediment and of oyster (Crassostrea gigas) farming on the accumulation and the recycling of different forms of organic and inorganic nitrogen are described. Fluxes of dissolved inorganic and organic forms of nitrogen were studied between the water column, the water overlying the sediment and the pore waters, while for particulate forms the fluxes were studied between suspended material, the "biodeposits" (faeces and pseudofaeces of Crassostrea) and the sediment. The flux of inorganic nitrogen amounts to 10.5 106 g.m(-2). Yr(-1), while that of organic nitrogen is half this figure. The particulate flux is 15.106 g.m(-2).yr(-1). On the other hand, the phytoplanktonic nitrogen accounts for only 6% of the total particulate...
Tipo: Text
Palavras-chave: Marenne Oleron; Sediment; Pore water; Interface; Crassostrea gigas; Nitrogen; Marennes Oléron; Sédiment; Eau interstitielle; Adsorption; Interface; Crassostrea gigas; Azote.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/publication-2878.pdf

Carbon partitioning and lipid remodeling during phosphorus and nitrogen starvation in the marine microalga   Diacronema lutheri   (Haptophyta)
Provedor de dados: 5
Autores: Huang, Bing; Mimouni, Virginie; Lukomska, Ewa; Morant-manceau, Annick; Bougaran, Gael.
The domesticated marine microalga Diacronema lutheri is of great interest for producing various highly valuable molecules like lipids, particularly long‐chain polyunsaturated fatty acids (LC‐PUFA). In this study, we investigated the impact of phosphorus (P) and nitrogen (N) starvation on growth, carbon fixation (photosynthetic activity) and partitioning, and membrane lipid remodeling in this alga during batch culture. Our results show that the photosynthetic machinery was similarly affected by P and N stress. Under N starvation, we observed a much lower photosynthetic rate and biomass productivity. The degradation and re‐use of cellular N‐containing compounds contributed to triacylglycerol (TAG) accumulation. On the other hand, P‐starved cells maintained...
Tipo: Text
Palavras-chave: Carbon partitioning; Diacronema lutheri; Nitrogen; Phosphorus; Polyunsaturated fatty acid.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00619/73071/72204.pdf

Food web structure of a Mediterranean coralligeneous ecosystem
Provedor de dados: 5
Autores: Belloni, Bruno; Sartoretto, Stephane; Cresson, Pierre; Bouchoucha, Marc; Guillou, Gael; Lebreton, Benoit; Ruitton, Sandrine; Harmelin-vivien, Mireille.
The coralligenous ecosystem is one of the biodiversity hotspots in the Mediterranean Sea. This study aims at determining (i) the organic matter (OM) sources at the base of the food web in a coralligenous  ecosystem  near  Marseille  (Cap  Caveau,  Frioul  Island)  and  (ii)  the  global functional structure of its community. For that purpose, C and N stable isotope analyses were performed on 78 compartments or species collected in this habitat between 30 and 40 m depth. Results  suggested  that  the  pelagic  particulate  organic  matter  (POM),  mainly  composed  of phytoplankton, was the main OM source fuelling coralligenous food webs, followed by sedimented organic matter (SOM) and some macrophytes. At least three level of consumers were identified from...
Tipo: Text
Palavras-chave: Food webs; Coralligenous ecosystem; Stable isotopes; Carbon; Nitrogen.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00483/59511/62396.pdf

Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France)
Provedor de dados: 5
Autores: Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models.  In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text
Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf

Allocation du carbone et métabolisme azoté chez l'haptophyte Tisochrysis lutea
Provedor de dados: 5
Autores: Garnier, Matthieu.
The aim of this thesis is to improve knowledge on mechanisms involved in the response to nitrogen limitation and in lipid accumulation in the microalgae haptophyte Tisochrysis lutea. The wild type strain and a lipid accumulating mutant strain were grown under different nitrogen limitation and starvation and analyzed by functional genomics. Four genes of high-affinity nitrate/nitrite transporter (Nrt2) were identified and characterized to reveal the mechanisms involved in mineral absorption in this species. Transcriptomes of both strains were sequenced and proteins affected by nitrogen starvation and differentially expressed between the two strains were identified. We so identified the functions regulated by nitrogen deficiency and potentially involved in...
Tipo: Text
Palavras-chave: Microalgues; Métabolisme; Azote; Carbone; Lipides; Genomique fonctionelle; Protéomique; Transcriptomique; Microalgae; Metabolism; Nitrogen; Carbon; Lipids; Functional genomics; Proteomics; Transcriptomics.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00353/46378/46000.pdf

Nutrient export to an Eastern Atlantic coastal zone: first modeling and nitrogen mass balance
Provedor de dados: 5
Autores: Canton, Mathieu; Anschutz, Pierre; Coynel, Alexandra; Polsenaere, Pierre; Auby, Isabelle; Poirier, Dominique.
We have studied 15 catchments supplying freshwater to a French Atlantic coastal lagoon, where increase in nitrogen loads due to agriculture is supposed to have destabilized the ecosystem in the last decades. The catchment is a lowland composed of Pleistocene sands with an average slope of 0.25%. To study the nutrient export in relation to land-use surface waters were sampled bi-weekly between October 2006 and January 2009 and land-use was established by plane photographs and Geographic Information System (GIS). Cultivated pine forests represent more than 80% of the total surface and 7% of the catchment area has been deforested recently. Significant areas of some catchments are used for maize crop. Housing is confined to the coastal zone. Maize and forest...
Tipo: Text
Palavras-chave: Nitrogen; Phosphorus; River export; Land use; Coastal catchment; Arcachon Bay; Modeling; Mass balance.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00065/17615/15173.pdf

Disentangling Drought and Nutrient Effects on Soil Carbon Dioxide and Methane Fluxes in a Tropical Forest
Provedor de dados: 5
Autores: Bréchet, Laëtitia; Courtois, Elodie A.; Saint-germain, Thomas; Janssens, Ivan A.; Asensio, Dolores; Ramirez-rojas, Irene; Soong, Jennifer L.; Van Langenhove, Leandro; Verbruggen, Erik; Stahl, Clément.
Tropical soils are a major contributor to the balance of greenhouse gas (GHG) fluxes in the atmosphere. Models of tropical GHG fluxes predict that both the frequency of drought events and changes in atmospheric deposition of nitrogen (N) will significantly affect dynamics of soil carbon dioxide (CO2) and methane (CH4) production and consumption. In this study, we examined the combined effect of a reduction in precipitation and an increase in nutrient availability on soil CO2 and CH4 fluxes in a primary French Guiana tropical forest. Drought conditions were simulated by intercepting precipitation falling through the forest canopy with tarpaulin roofs. Nutrient availability was manipulated through application of granular N and/or phosphorus (P) fertilizer to...
Tipo: Text
Palavras-chave: Carbon dioxide; Drought; Fertilization; Methane; Nitrogen; Phosphorus; Soil GHG fluxes; Tropical forest.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70694/68903.pdf

Atmospheric deposition of elements and its relevance for nutrient budgets of tropical forests
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Verryckt, Lore T.; Bréchet, Laëtitia; Courtois, Elodie A.; Stahl, Clement; Hofhansl, Florian; Bauters, Marijn; Sardans, Jordi; Boeckx, Pascal; Fransen, Erik; Peñuelas, Josep; Janssens, Ivan A.
Atmospheric deposition is an important component of the nutrient cycles of terrestrial ecosystems, but field measurements are especially scarce in tropical regions. In this study we analysed 15 months of precipitation chemistry collected in an old growth tropical forest located in French Guiana. We measured nutrient inputs via bulk precipitation and throughfall and used the canopy budget model to estimate nutrient fluxes via canopy exchange and dry deposition. Based on this method we quantified net fluxes of macronutrients and compared their contribution to internal cycling rates via litterfall. Our results suggest that while atmospheric deposition of nitrogen was relatively high (13 kg ha−1 year−1), and mainly in organic forms, the N inputs via litterfall...
Tipo: Text
Palavras-chave: Throughfall; Litterfall; Nutrient cycling; Nitrogen; Phosphorus; Potassium.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74123/73572.pdf

Dark metabolism and carbon-nitrogen uncoupling in the toxic dinoflagellate Alexandrium catenella (Dinophyceae)
Provedor de dados: 5
Autores: Jauzein, Cecile; Collos, Yves; Laabir, Mohamed; Vaquer, Andre.
Uptake rates of three potential N-sources (ammonium, nitrate and N-urea) and two potential C-sources (HCO(3)(-) and C-urea) were estimated during growth of Alexandrium catenella in both light and dark phases. According to the variations observed in (13)C-isotopic ratio, A. catenella cells were not able to use C-urea. Furthermore, decreases in (13)C cell content during darkness revealed a probably high involvement of C recently fixed in dark respiration. Dark N-uptake capacities of A. catenella were characterized by dark/light uptake ratio of 27%, 43% and 65% for NO(3)(-), NH(4)(+) and N-urea, respectively. An accumulation of C-rich compounds during the light period was highlighted through strong diel variations in C:N ratio and would provide C and energy...
Tipo: Text
Palavras-chave: Diel cycle; Dark uptake; Nitrogen; Carbon; Uncoupling; Alexandrium catenella.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00056/16699/14199.pdf

Les elements nutritifs en baie de Seine
Provedor de dados: 5
Autores: Aminot, Alain; Kerouel, Roger; Mauvais, J.
Seasonal variations of dissolved nutrient concentrations are reported in this paper. Impacts of freshwater are investigated by the study of dilution, nutrient quantity, and relation with phytoplanktonic growth.
Tipo: Text
Palavras-chave: Silicon; Phosphorus; Nitrogen; Seasonal variations; Dilution; Primary production; Eutrophic waters; Phytoplankton; River discharge; Coastal zone; Nutrients (mineral).
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1295.pdf

Voluntary feed intake, nitrogen and phosphorus losses in rainbow trout (Oncorhynchus mykiss) fed increasing dietary levels of soy protein concentrate
Provedor de dados: 5
Autores: Medale, Francoise; Boujard, Thierry; Vallee, Frédéric; Blanc, Denise; Mambrini, Muriel; Roem, Arjen; Kaushik, Sadasivam.
High energy extruded diets were formulated to contain the same level of protein supplied either by soy protein concentrate (SPC) or fish meal. Three experiments were performed in order to measure voluntary feed intake and feed waste, faecal losses and soluble losses of nitrogen and phosphorus in rainbow trout (average body weight: 100 g). Voluntary feed intake and growth performance of fish fed with demand feeders were not different when diets contained 0, 50 or 75 % SPC instead of fish meal. Total replacement of fish meal by SPC led to a significant decrease in feed intake and resulted in poor growth. This was partly due to methionine deficiency in the SPC based diet. With the addition of crystalline DL-methionine in the diets, an improvement of feed...
Tipo: Text
Palavras-chave: Digestibilité; Excrétion; Azote; Phosphore; Protéine de soja; Ingestion volontaire; Truite arc-en-ciel; Digestibility; Excretion; Nitrogen; Phosphorus; Soy protein; Voluntary feed intake; Rainbow trout.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-871.pdf

Effects of Organic and Inorganic Nitrogen on the Growth and Production of Domoic Acid by Pseudo-nitzschia multiseries and P. australis (Bacillariophyceae) in Culture
Provedor de dados: 5
Autores: Martin-jezequel, Veronique; Calu, Guillaume; Candela, Leo; Amzil, Zouher; Jauffrais, Thierry; Sechet, Veronique; Weigel, Pierre.
Over the last century, human activities have altered the global nitrogen cycle, and anthropogenic inputs of both inorganic and organic nitrogen species have increased around the world, causing significant changes to the functioning of aquatic ecosystems. The increasing frequency of Pseudo-nitzschia spp. in estuarine and coastal waters reinforces the need to understand better the environmental control of its growth and domoic acid (DA) production. Here, we document Pseudo-nitzschia spp. growth and toxicity on a large set of inorganic and organic nitrogen (nitrate, ammonium, urea, glutamate, glutamine, arginine and taurine). Our study focused on two species isolated from European coastal waters: P. multiseries CCL70 and P. australis PNC1. The nitrogen...
Tipo: Text
Palavras-chave: Pseudo-nitzschia; Toxic diatoms; Nitrogen; Amino acids; Domoic acid.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00308/41912/41188.pdf

Matière en suspension et sédimentation dans la lagune de Thau
Provedor de dados: 5
Autores: Pichot, Paul; Deslous-paoli, Jean-marc; Juge, Claude.
Thau is a mediterranean lagoon with a large productive stock of molluscs (oysters, mussels) cultivated on suspended tines and colonised by epibionta (ascidia and others invertebrates, algae, etc ... ). This study was developed as part of the PNOC-OXYTHAU.programme. Its aim was to analyze the effects of oyster farrning on water-mass surrounding structures loaded with suspended molluscs and proximal watermass separating these structures. This study concems particulate suspended matter and deposits of particulate organic matter on the bottom after sedimnentation. Biochemical measurements were carried out for nitrogen, carbon,  proteins, lipids and carbohydrates. ln order to estimate sedimentaton, bottom sediment traps were used
Tipo: Text
Palavras-chave: Méditérranée; Etang de Thau; Matière en suspension; Azote; Carbone; Protites; Lipides; Glucides; Sédimentation; Mediterranean; Lagoon of Thau; Particulate suspended mattter; Nitrogen; Carbon; Proteins; Lipids; Carbohydraes; Sedimentation.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00425/53662/54501.pdf

Evaluation of Nitrogen and Phosphorus Fertilizer Placement With Strip Tillage for Irrigated Pacific Northwest Corn Production
Provedor de dados: 18
Autores: Tarkalson, D.D.; Bjorneberg, D.L.
Nutrient placement options with strip tillage (ST) can potentially improve plant nutrient utilization and increase crop yield compared to conventional fertilizer placement practices under conventional tillage (CT). The effects of tillage practice and nitrogen (N) and phosphorus (P) placement on grain yield, biomass yield (whole plant, grain + cobs + stover), and N and P uptake of field corn (Zea mays L.) were assessed on four sites during 2007 and 2009 at the USDA-ARS Northwest Irrigation &amp; Soils Research Laboratory at Kimberly, ID. During each year, two locations (eroded and not eroded from furrow irrigation) were utilized as study locations. Band placement of fertilizer with ST increased corn grain yield by 12.5 % (11 bu/acre) and 25.9% (26 bu/acre)...
Tipo: Conference or Workshop Item
Palavras-chave: Tillage; Nitrogen; Phosphorous.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1386/1/1361.pdf

Nitrogen Use Efficiency of Irrigated Corn for Three Cropping Systems in Nebraska
Provedor de dados: 18
Autores: Wortmann, C.S.; Tarkalson, D.D.; Shapiro, C.A.; Dobermann, A.R.; Ferguson, R.B.; Hergert, G.W.; Walters, D.T.
Nitrogen use efficiency (NUE) is of economic and environmental importance.  Components of NUE were evaluated in 32 irrigated corn (Zea mays L.) trials conducted across Nebraska with different N rates and where the previous crop was either corn (CC), drybean  (Phaseolus vulgaris L.) (CD), or soybean (Glycine max L.) (CS).  The mean grain yield with adequate nutrient availability was 14.7 Mg ha–1 .  When no N was applied, measured soil properties and irrigation water N accounted for &lt;20% of the variation in plant N  uptake (UN).  Mean fertilizer N recovery in above-ground biomass was 74% at the lowest N rate compared with 40% at the highest N rate, a mean of 64% at the economically optimal N rate (EONR), and least with CD.  Agronomic efficiency of...
Tipo: Article
Palavras-chave: Corn / maize; Nitrogen.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1414/1/1384.pdf

Dairy Manure Nitrogen Availability in Eroded and Noneroded Soil for Sugarbeet Followed by Small Grains
Provedor de dados: 18
Autores: Lentz, R.D.; Lehrsch, G.A.; Brown, Bradford; Johnson-Maynard, J.; Leytem, A.B.
Efficient recycling of abundant manure resources from regional dairy industries in the semiarid West requires a better understanding of N availability in manure-amended soils. We measured net N mineralization using buried bags, and crop biomass, N uptake, and yields for sprinkler-irrigated, whole (noneroded) and eroded Portneuf soils (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) subject to a one-time manure application. Treatments included a control, fertilizer, two rates of composted dairy manure (28.4, 64.3 Mg ha–1, dry wt.), and two rates of stockpiled dairy manure (23.3, 45.7 Mg ha–1, dry wt.) applied in the fall before the Year 1 cropping season. Plots were planted to sugarbeet (Beta vulgaris L.), winter wheat (Triticum...
Tipo: Article
Palavras-chave: Manure; Amendments; Nitrogen.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1420/1/1390.pdf

Clinoptilolite Zeolite Influence on Inorganic Nitrogen in Silt Loam and Sandy Agricultural Soils
Provedor de dados: 18
Autores: Tarkalson, D.D.; Ippolito, J.A.
Development of best management practices can help improve inorganic nitrogen (N) availability to plants and reduce nitrate-nitrogen (NO3-N) leaching in soils.  This study was conducted to determine the influence of the zeolite mineral Clinoptilolite (CL) additions on NO3-N and ammonium-nitrogen (NH4-N) in two common Pacific Northwest soils.  The effects of CL application rate (up to 26.9 Mg ha-1) either band applied or mixed with a set rate of nitrogen (N) fertilizer on masses of NO3-N and NH4-N in leachate and soil was investigated in a column study using a Portneuf silt loam (coarse-silty mixed mesic Durixerollic Caliciorthid) and a Wolverine sand (Mixed, frigid Xeric Torripsamment).  All treatments for each soil received a uniform application of N from...
Tipo: Article
Palavras-chave: Practical farm efficiency; Nitrogen; Soil.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1431/1/1401.pdf

Residual Nitrate and Mineralizable Soil Nitrogen in Relation to Nitrogen Uptake by Irrigated Sugarbeets
Provedor de dados: 18
Autores: Stanford, George; Carter, J.N.; Westermann, D.T.; Meisinger, J.J.
Tipo: Article
Palavras-chave: Sugarbeet; Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1977
URL: http://eprints.nwisrl.ars.usda.gov/334/1/397.pdf

Bragg soybeans grown on a Southern Coastal Plain soil. IV. Seasonal changes in nodal N and P concentrations
Provedor de dados: 18
Autores: Sojka, R.E.; Karlen, D.L.; Scott, H.D.
Tipo: Article
Palavras-chave: Bean / dry bean; Nitrogen; Phosphorous; Mass Import - autoclassified (may be erroneous).
Ano: 1989
URL: http://eprints.nwisrl.ars.usda.gov/524/1/689.pdf

Estimates of Potentially Mineralizable Soil Nitrogen Based on Short-term Incubations
Provedor de dados: 18
Autores: Stanford, George; Carter, J.N.; Smith, S.J.
Tipo: Article
Palavras-chave: Nitrogen; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1974
URL: http://eprints.nwisrl.ars.usda.gov/264/1/293.pdf

Effect of Soil Contamination on the Mineral Composition of Forage Fertilized with Nitrogen
Provedor de dados: 18
Autores: Mayland, H.F.; Sneva, F.E.
Tipo: Article
Palavras-chave: Chemistry; Fertilizer; Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1983
URL: http://eprints.nwisrl.ars.usda.gov/403/1/508.pdf

Hardwood biochar influences calcareous soil physicochemical and microbiological status
Provedor de dados: 18
Autores: Ippolito, J.A.; Stromberger, M.E.; Lentz, R.D.; Dungan, R.S.
The effects of biochar application to calcareous soils are not well documented. In a laboratory incubation study, a hardwood-based, fast pyrolysis biochar was applied (0, 1, 2, and 10% by weight) to a calcareous soil. Changes in soil chemistry, water content, microbial respiration, and microbial community structure were monitored over a 12-month period. Increasing biochar application rate increased the water holding capacity of the soil-biochar blend, a trait that could be beneficial under water limited situations. Biochar application also caused an increase in plant-available iron and manganese, soil carbon content, soil respiration rates, bacterial populations, and a decrease in soil nitrate-nitrogen concentration. Biochar rates of 2 and 10% altered the...
Tipo: Article
Palavras-chave: Calcareous soil; Nitrogen; Nutrients.
Ano: 2014
URL: http://eprints.nwisrl.ars.usda.gov/1532/1/1490.pdf

Biosolids Application to No-Till Dryland Agroecosytems
Provedor de dados: 18
Autores: Ippolito, J.A.; Barbarick, K.A.; McDaniel, J.P.; Hansen., N.C.; Peterson, G.A.
Dryland agroecosystems are generally ideal environments for recycling biosolids.  However, what is the efficacy of biosolids addition to a no-till dryland management agroecosystem?  From 2000 to 2010, we studied application of biosolids from the Littleton/Englewood, CO Wastewater Treatment Plant versus commercial nitrogen fertilizer in dryland no-till wheat (Triticum aestivum, L.)-fallow (WF) and wheat-corn (Zea mays, L.)-fallow (WCF) rotations at a site approximately 50 miles east of Denver, CO.  We tested if biosolids would produce the same yields and grain phosphorus, zinc, and barium concentrations as an equivalent rate of nitrogen fertilizer, that biosolids-borne phosphorus, zinc, and barium would not migrate below the 4 inch soil depth, and that...
Tipo: Article
Palavras-chave: Small grain; Dryland crops; Nitrogen; Phosphorous.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1446/1/1411.pdf

Planting System Effect on Yield Response of Russet Norkotah to Irrigation and Nitrogen under High Intensity Sprinkler Irrigation
Provedor de dados: 18
Autores: King, B.A.; Tarkalson, D.D.; Bjorneberg, D.L.; Taberna, J.P, Jr.
Conversion of potato ridged-row planting systems to wide bed planting systems may increase water and nitrogen use efficiency in commercial irrigated potato production systems by reducing the amount of irrigation water and water applied nitrogen fertilizer bypassing the potato root zone. Wide bed planting systems consist of planting multiple rows on a wide bed with 20 to 35% higher plant population than found in conventional ridgedrow planting systems. The objective of this study was to evaluate the effect planting system has on yield response of ‘Russet Norkotah’ potato to irrigation and nitrogen.  Planting systems evaluated were (1) conventional ridgedrow with dammer-diking; (2) 3.7 m wide bed with five potato rows spaced 66 cm between adjacent rows...
Tipo: Article
Palavras-chave: Practical farm efficiency; Sprinkler irrigation; Potato; Nitrogen.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1425/1/1395.pdf

Nitrogen Availability From Manure in Years Following a One-Time Application
Provedor de dados: 18
Autores: Lentz, R.D.; Lehrsch, G.A.
Manure from the semiarid West’s dairy industries is a rich nutrient source, but its use for crops can be problematic because soil N availability from manure may vary substantially depending on the year of application.  Experimental plots established in Idaho on a Portneuf silt loam (coarse silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) included six manure treatments and two non-manure treatments with four replicates.  The six manure treatments included combinations of two manure rates, Man-1x (277 lbs total N/ac) and Man-3x (866 lbs total N/ac) applied in the fall either 1, 2, or 3 years previously.  The two non-manure treatments were urea fertilizer applied per soil test (Fert) and a control with no amendment. We measured net N...
Tipo: Article
Palavras-chave: Manure; Nitrogen; Soil.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1447/1/1412.pdf

Regression modeling weather and biolsolids effects on dryland wheat yields in Eastern Colorado, 2001-2012
Provedor de dados: 18
Autores: Barbarack, K.A.; Ippolito, J.A.; McDaniel, J.P.; Hansen., N.C.; Peterson, G.A.
In the western Great Plains, climate dictates dryland wheat (Triticum aestivum, L) productivity. Producers use inorganic N fertilizers to improve crop yields in this region, while municipalities recycle sewage biosolids in the area. Will biosolids (from the Littleton/Englewood, CO Wastewater Treatment Plant) applications to western Great Plains dryland agroecosystems interact with weather to affect wheat production? To this end, we regressed crop yields on weather variables from 2000 through 2011 at a site about 40 km (approximately 25 miles) east of Byers, CO (Byers). We used SAS (Proc Reg) to develop several multiple regression models to predict crop yields. Our model of choice included four weather parameters for Byers wheat production. Regression...
Tipo: Technical Bulletin
Palavras-chave: Dryland crops; Fertilizer; Nitrogen.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1515/1/1479.pdf

Nitrate accumulation and movement under deficit irrigation in soil receiving cattle manure and commercial fertilizer
Provedor de dados: 18
Autores: Tarkalson, D.D.; Payero, J.O.; Ensley, S.M.; Shapiro, C.A.
Nitrate leaching from agricultural soils can increase groundwater nitrate concentrations.  The objectives of the study were to assess the accumulation and movement of nitrate in the  soil profile over a 2-year period under deficit irrigation conditions following a one time  application of N in cattle feedlot manure and commercial fertilizer to corn at rates to achieve  yield goals expected under conditions of full irrigation. Cattle manure and ammonium  nitrate were applied in 2002 at the University of Nebraska recommended rate (1M and 1F ;  respectively) and cattle manure was applied at twice the recommended rate (2M) for N for  the 2002 corn (Zea mays L.) crop. The recommended rate was based on expected yields under  full irrigation. The manure N...
Tipo: Article
Palavras-chave: Chemistry; Fertilizer; Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/59/1/1220.pdf

Studies of Methods for Measuring Forms of Available Soil Nitrogen
Provedor de dados: 18
Autores: Hunter, Albert S.; Carter, David L.
Tipo: Article
Palavras-chave: Nitrogen; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1965
URL: http://eprints.nwisrl.ars.usda.gov/300/1/34.pdf

Nitrogen Availability and Uptake by Sugarbeet in Years Following Manure Application
Provedor de dados: 18
Autores: Lentz, R.D.; Lehrsch, G.A.
The use of solid dairy manure for sugarbeet production is problematic because beet yield and quality are sensitive to deficiencies or excesses in soil N, and soil N availability from manure varies substantially depending on the year of application. Experimental treatments included combinations of two manure rates (0.33 and 0.97 Mg total N ha-1) and three application times, and no manure treatments (control and urea fertilizer). We measured soil net N mineralization and biomass, N uptake, and yields for sprinkler-irrigated sugarbeet. On average, the 1-year-old, low-rate manure, and 1- and 2-year-old, high-rate manure treatments produced 1.2-fold greater yields, 1.1-fold greater estimated recoverable sugar, and 1.5-fold greater gross margins than that of...
Tipo: Article
Palavras-chave: Sugarbeet; Manure; Nitrogen.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1454/1/1419.pdf

Seasonal phosphate activity in three characteristic soils of the English uplands polluted by long-term atmospheric nitrogen deposition
Provedor de dados: 18
Autores: Turner, Benjamin L.; Baxter, Robert; Whitton, Brian A.
Tipo: Article
Palavras-chave: Nitrogen; Phosphorous; Mass Import - autoclassified (may be erroneous).
Ano: 2002
URL: http://eprints.nwisrl.ars.usda.gov/142/1/1080.pdf

Biochar and manure effects on net nitrogen mineralization and greenhouse gas emissions from calcareous soil under corn
Provedor de dados: 18
Autores: Lentz, R.D.; Ippolito, J.A.; Spokas, K.A.
Few multiyear field studies have examined the impacts of a one-time biochar application on net N mineralization and greenhouse gas emissions in an irrigated, calcareous soil; yet such applications are hypothesized as a means of sequestering atmospheric CO2 and improving soil quality.  We fall-applied four treatments, stockpiled dairy manure (42 Mg/ha dry wt.); hardwood-derived biochar (22.4 Mg/ha); combined biochar and manure; and no amendments (control).  Nitrogen fertilizer was applied in all plots and years based on treatment’s pre-season soil test N and crop requirements, and accounting for estimated N mineralized from added manure.  From 2009 to 2011 we measured greenhouse gas fluxes using vented chambers, net N mineralization (NNM) using buried bags,...
Tipo: Article
Palavras-chave: Corn; Manure; Chemistry; Nitrogen; Soil.
Ano: 2014
URL: http://eprints.nwisrl.ars.usda.gov/1558/1/1514.pdf

Influence of Silica and Nitrogen Contents and Straw Application Rate on Decomposition of Gaines Wheat Straw in Soil
Provedor de dados: 18
Autores: Smith, J.H.; Douglas, C.L.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1970
URL: http://eprints.nwisrl.ars.usda.gov/90/1/163.pdf

Modeling Water and Nitrogen Behavior in the Soil-Plant System
Provedor de dados: 18
Autores: Frere, M.H.; Jensen, M.E.; Carter, J.N.
Tipo: Conference or Workshop Item
Palavras-chave: Nitrogen; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1970
URL: http://eprints.nwisrl.ars.usda.gov/973/1/204.pdf

Convenient Estimation of Soil Organic-N Using the Udy Dye System
Provedor de dados: 18
Autores: Massee, T.W.
Tipo: Article
Palavras-chave: Nitrogen; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1975
URL: http://eprints.nwisrl.ars.usda.gov/292/1/335.pdf

Distribution of Nitrogen Fixed in Desert Algal-Crusts
Provedor de dados: 18
Autores: Mayland, H.F.; McIntosh, T.H.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1966
URL: http://eprints.nwisrl.ars.usda.gov/335/1/39.pdf

Addition of activated switchgrass biochar to an aridic subsoil increases microbial nitrogen cycling gene abundances
Provedor de dados: 18
Autores: Ducey, Tom; Ippolito, J.A.; Cantrell, K.B.; Novak, J.M.; Lentz, R.D.
It has been demonstrated that soil amended with biochar, designed specifically for use as a soil conditioner, results in changes to the microbial populations that reside therein. These changes have been reflected in studies measuring variations in microbial activity, biomass, and community structure. Despite these studies, very few experiments have been performed examining microbial genes involved in nutrient cycling processes. Given the paucity of research in this area, we designed a six-month study in a Portneuf soil (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) treated with three levels (1%, 2%, and 10% w/w ratio) of a biochar pyrolyzed from switchgrass (Panicum virgatum) at 350°C and steam activated at 800°C to measure the...
Tipo: Article
Palavras-chave: Amendments; Chemistry; Nitrogen; Soil.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1517/1/1481.pdf

Nitrogen Gradients and Nitrification Associated with Decomposing Corn Plants and Barley Straw in Soil
Provedor de dados: 18
Autores: Smith, J.H.
Tipo: Article
Palavras-chave: Corn / maize; Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1967
URL: http://eprints.nwisrl.ars.usda.gov/559/1/74.pdf

Ion Gradients and Nitrification Associated with Decomposition of a Plant Material Layer in Soil
Provedor de dados: 18
Autores: Smith, J.H.; Burns, G.R.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1965
URL: http://eprints.nwisrl.ars.usda.gov/340/1/40.pdf

Evaluation of Nitrogen and Phosphorus Fertilizer Placement With Strip Tillage for Irrigated Pacific Northwest Corn Production
Provedor de dados: 18
Autores: Tarkalson, D.D.; Bjorneberg, D.L.
Nutrient placement options with strip tillage (ST) can potentially improve plant nutrient utilization and increase crop yield compared to conventional fertilizer placement practices under conventional tillage (CT). The effects of tillage practice and nitrogen (N) and phosphorus (P) placement on grain yield, biomass yield (whole plant, sum of grain, cobs, and stover), and N and P uptake of field corn (Zea mays L.) were assessed on four sites during 2007 and 2009 at the USDA-ARS Northwest Irrigation &amp; Soils Research Laboratory at Kimberly, ID. During each year, two locations (eroded and not eroded from furrow irrigation) were utilized as study locations. Band placement of fertilizer with ST increased corn grain yield by 12.5 percent (689 kg per ha) and...
Tipo: Article
Palavras-chave: Fertilizer; Soil; Nitrogen; Phosphorous.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1383/1/1358.pdf

Development and application of a soil organic matter based soil quality index in mineralized terrane of the Western US
Provedor de dados: 18
Autores: Blecker, S.W.; STILLINGS, L.L.; AMACHER, M.C.; Ippolito, J.A.; DECRAOPPEO, N.M.
Soil quality indices provide a means of distilling large amounts of data into a single metric that evaluates the soil’s ability to carry out key ecosystem functions. Primarily developed in agroecosytems, then forested ecosystems, we set out to develop and apply an index using the relation between soil organic matter and key soil abiotic and biotic properties in more semi-arid of the Western US arid systems impacted by different geologic mineralization types. We studied these relations in three different mineralization types: serpentine, acid sulfate and Cu/Mo porphyry systems at four different sites in California and Nevada. Soil samples were collected from undisturbed soils in both mineralized and nearby unmineralized terrane as well as waste rock and...
Tipo: Article
Palavras-chave: Nitrogen; Soil.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1489/1/1453.pdf

Nitrogen Response and Economics for Irrigated Corn in Nebraska
Provedor de dados: 18
Autores: Dobermann, A.R.; Wortmann, C.S.; Ferguson, R.B.; Hergert, G.W.; Shapiro, C.A.; Tarkalson, D.D.; Walters, D.T.
Nitrogen management recommendations may change as yield levels and efficiency of crop production increase.  The mean yield with adequate nutrient availability in 32 irrigated corn (Zea mays L.) trials conducted across Nebraska to evaluate crop response to split-applied N was 14.8 Mg per ha. The mean economically optimal N rates (EONR) for irrigated corn varied with the fertilizer N to grain price ratio.  At a fertilizer N:corn price ratio of 7, the EONR was 171, 122, and 93 kg per hectare, respectively, for cropping systems with corn following corn (CC), soybean (Glycine max L.) (CS), and drybean (Phaseolus vulgaris L.) (CD).  At this price ratio the present  University of Nebraska (UNL) recommendation procedure gave mean N  recommendations that were 17.2,...
Tipo: Article
Palavras-chave: Corn / maize; Nitrogen.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1415/1/1385.pdf

Nitrogen and Phosphorus Fertilizer Placement in Corn Production
Provedor de dados: 18
Autores: Tarkalson, D.D.; Bjorneberg, D.L.
The use of strip tillage and other conservation tillage practices are used to conserve soil and soil water through residue management and reduce tillage costs in many areas of the Corn Belt. However, in the Pacific Northwest these tillage practices are less common. Strip tillage is becoming more common in the sugar beet industry in southern Idaho and due to the high dairy cow populations, corn production is increasing. The dual use of strip tillage for sugar beet and corn production will likely continue to develop, increasing the need for strip tillage best management practices in this region. In this study we evaluated the effects of common and logical nitrogen and phosphorus placements with strip tillage and conventional tillage on grain yield on four...
Tipo: Article
Palavras-chave: Tillage; Nitrogen; Phosphorous.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1388/3/1363.pdf

Use of time domain reflectometry for continuous monitoring of nitrate-nitrogen in soil and water
Provedor de dados: 18
Autores: Payero, J.O.; Tarkalson, D.D.; Irmak, S.
Nitrate-Nitrogen (NO3 -N) losses to ground and surface water are an environmental and agronomic concern in  modern crop production systems in the Central Great Plains. Monitoring techniques for nitrogen use in agricultural  production are needed to increase crop yield, optimize nitrogen use, and reduce NO 3 -N leaching. Time domain reflectometry  (TDR) could potentially be calibrated to continuously measure NO3 -N in soil and water. The objectives of this study were to:  (1) evaluate the effect of different factors affecting the response of the bulk electrical conductivity (ECb) sensed by TDR, (2)  compare the sensitivity and differences between vertically-installed and horizontally-installed probes for measuring NO3 -N  leaching in the soil profile, and...
Tipo: Article
Palavras-chave: Nitrogen; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/60/1/1221.pdf

Studying nitrate-N leaching with a bromide tracer in an irrigated silt loam soil
Provedor de dados: 18
Autores: Wright, J.L.; Westermann, D.T.; Lehrsch, G.A.
Tipo: Conference or Workshop Item
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1998
URL: http://eprints.nwisrl.ars.usda.gov/861/1/976.pdf

The relationship of particle size and nitrogen content to decomposition of wheat straw in soil
Provedor de dados: 18
Autores: Smith, J.H.; Douglas, C.L.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1967
URL: http://eprints.nwisrl.ars.usda.gov/181/1/117.pdf

Influence of nitrogen on cellulose and lignin mineralization in blackwater and redwater forested wetland soils
Provedor de dados: 18
Autores: Entry, James A.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 2000
URL: http://eprints.nwisrl.ars.usda.gov/107/1/1019.pdf

Influence of nitrogen on atrazine and 2, 4 dichlorophenoxyacetic acid mineralization in blackwater and redwater forested wetland soils
Provedor de dados: 18
Autores: Entry, J.A.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1999
URL: http://eprints.nwisrl.ars.usda.gov/716/1/992.pdf

Nitrogen Mineralization Response to Tillage Practices on Low and High Nitrogen Soils
Provedor de dados: 18
Autores: Moore, Amber; Tarkalson, D.D.
Decomposition rates directly affect carbon and nitrogen ratios, which can affect nitrogen mineralization rates. The objective of this research is to determine the effect of tillage method and nitrogen rate on nitrogen available to sugar beets planted after a cereal crop. This two-year field study conducted in Kimberly, Idaho, consisted of three tillage methods (moldboard plow, chisel plow, and strip tillage), two tillage timings (fall and spring), and four fertilizer N rates plus a control. Soils from each plot were sampled shortly after nitrogen fertilization and incubated at average seasonal temperatures for Kimberly, Idaho to monitor nitrogen mineralization patterns. In 2008, we found that at N fertilizer rates of 0, 50, and 100 lbs N per acre,...
Tipo: Conference or Workshop Item
Palavras-chave: Tillage; Nitrogen.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1387/3/1362.pdf

Determining Nitrogen Fertilizer Needs for Sugarbeets from Residual Soil Nitrate and Mineralizable Nitrogen
Provedor de dados: 18
Autores: Carter, J.N.; Jensen, M.E.; Bosma, S.M.
Tipo: Article
Palavras-chave: Sugarbeet; Fertilizer; Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1974
URL: http://eprints.nwisrl.ars.usda.gov/256/1/282.pdf

Polyacrylamide as an organic nitrogen source for soil microorganisms with potential effects on inorganic soil nitrogen in agricultural soil
Provedor de dados: 18
Autores: Kay-Shoemake, Jeanine L.; Watwood, Mary E.; Lentz, Rodrick D.; Sojka, Robert E.
Tipo: Article
Palavras-chave: Water-soluble PAM (WSPAM); Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1998
URL: http://eprints.nwisrl.ars.usda.gov/708/1/981.pdf

High yield corn production can result in high nitrogen use efficiency
Provedor de dados: 18
Autores: Wortmann, C.C.; Shapiro, C.A.; Dobermann, Achim; Ferguson, Richard; Hergert, G; Walters, Daniel; Tarkalson, D.D.
Alarm is expressed about the environmental impact of the increasing amount of reactive N in the atmosphere and in terrestrial and marine ecosystems around the globe. Much of this increase is attributed to production and use of N fertilizer. Use of fertilizer N is essential to meet growing global demand for agricultural commodities. Management is key to increasing productivity while also increasing N use efficiency and reducing N losses. A team of University of Nebraska-Lincoln scientists, with partial funding from the Nebraska State Legislature, addressed this challenge. They conducted 32 irrigated trials across diverse production conditions of Nebraska from 2002 to 2004 to evaluate corn response to rates of split-applied N. The results were reported in...
Tipo: Article
Palavras-chave: Air Emissions; Chemistry; Fertilizer; Nitrogen; Soil.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1579/1/1535.pdf

Clinoptilolite Zeolite Influence on Nitrogen in a Manure-Amended Sandy Agricultural Soil
Provedor de dados: 18
Autores: Tarkalson, D.D.; Ippolito, J.A.
Development of best management practices can help improve inorganic nitrogen (N) availability to plants and reduce nitrate-nitrogen (NO3-N) leaching in soils. This study was conducted to determine the influence of the zeolite mineral clinoptilolite (CL) additions on NO3-N and ammonium-nitrogen (NH4-N) in two common Pacific Northwest soils. The effects of CL application rate (up to 26.9 Mg ha-1) either band applied or mixed with a set rate of N fertilizer on masses of NO3-N and NH4-N in leachate and soil were investigated in a column study using a Portneuf silt loam (coarse-silty mixed mesic Durixerollic Caliciorthid) and a Wolverine sand (Mixed, frigid Xeric Torripsamment). All treatments for each soil received a uniform application of N from urea...
Tipo: Article
Palavras-chave: Amendments; Nitrogen; Soil.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1436/1/1403..pdf

Measuring Soil Nitrogen Mineralization Under Field Conditions
Provedor de dados: 18
Autores: Westermann, D.T.; Crothers, S.E.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1980
URL: http://eprints.nwisrl.ars.usda.gov/370/1/455.pdf

Decomposition of Bt and non-Bt corn hybrid residues in the field. Nutrient Cycling in Agroecosystems
Provedor de dados: 18
Autores: Tarkalson, D.D.; Kachman, S.D.; Knops, J.M.N.; Thies, J.E.; Wortmann, C.S.
Results of a previous laboratory study indicated that six transgenic crops expressing the Cry1Ab insecticidal protein from Bacillus thuringiensis (Bt) decomposed at a slower rate than their respective non-Bt isolines. Consequently, litter decomposition rates, nitrogen cycling, and carbon pools may change in agricultural systems as the result of the widespread use of Bt crops. In this study, we assessed the decomposition rates and chemical composition of commonly grown hybrids of Bt and non-Bt isolines of corn (Zea mays L.) in the field. Leaves, stalks, and cobs from two Bt corn hybrids (Pioneer 34N44 Bt and NC+ 4990 Bt) and their non-Bt isolines (Pioneer 34N43 and NC+ 4880) were analyzed for biomass fractions (soluble, hemicellulose, cellulose, and lignin)...
Tipo: Article
Palavras-chave: Nitrogen.
Ano: 2008
URL: http://eprints.nwisrl.ars.usda.gov/1273/1/1250.pdf

Infrequent Composted Biosolids Applications Affect Semi-arid Grassland Soils and Vegetation
Provedor de dados: 18
Autores: Ippolito, J.A.; Barbarick, K.A.; Paschke, M.W.; Brobst, R.B.
Tipo: Article
Palavras-chave: Soil; Nitrogen; Phosphorous.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1356/1/1334.pdf

Using soil texture to guide variable-rate nitrogen fertilization
Provedor de dados: 18
Autores: Hobson, Jared; Ellsworth, Jason; Leytem, April; Pool, Ann.
Tipo: Conference or Workshop Item
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 2004
URL: http://eprints.nwisrl.ars.usda.gov/928/1/1134.pdf

Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms
Provedor de dados: 18
Autores: Mayland, H.F.; McIntosh, T.H.; Fuller, W.H.
Tipo: Article
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1966
URL: http://eprints.nwisrl.ars.usda.gov/451/1/56.pdf

Zeolite Soil Application Method Affects Inorganic Nitrogen, Moisture, and Corn Growth
Provedor de dados: 18
Autores: Ippolito, J.A.; Tarkalson, D.D.; Lehrsch, G.A.
Adoption of new management techniques which improve soil water storage and soil nitrogen  plant availability yet limit nitrogen leaching may help improve environmental quality.  A benchtop study was conducted to determine the influence of a single urea fertilizer rate (224 kilograms of Nitrogen per hectare) applied with band or fully-mixed zeolite (Clinoptilolite) application rates (up to 90 megagrams per hectare) on ammonium-nitrogen and nitrate-nitrogen concentrations in a Portneuf silt loam.  Two additional greenhouse experiments were carried out to test the soil moisture status and corn growth in a Wolverine sand.  Mixing urea fertilizer into silt loam soil resulted in greater urea mineralization, but the mixed zeolite was more effective at adsorbing...
Tipo: Article
Palavras-chave: Corn / maize; Amendments; Nitrogen.
Ano: 2011
URL: http://eprints.nwisrl.ars.usda.gov/1416/1/1386.pdf

Delayed sample filtration and storage effects on dissolved nutrients measured in agricultural runoff
Provedor de dados: 18
Autores: Lentz, R.D.
Standard water quality analysis methods recommend that sediment-laden runoff waters sampled to determine dissolved nutrient concentrations be filtered immediately after collection.  Few research studies have examined the influence of delayed filtration on sample stability or nutrient loss assessments.  Twenty eight runoff water volumes were collected from 3 irrigation furrows during a 12-h irrigation set.  Four subsamples of each volume were obtained; 2 were filtered (45 µm) in the field and the other 2 were filtered 10 days later, with or without boric acid treatment (1 mL saturated H3BO3 solution per 100 mL sample). All samples were refrigerated at 4 deg. C.  Dissolved reactive P (DRP), NO3-N, and NH4-N concentrations were measured in all filtered...
Tipo: Article
Palavras-chave: Nitrogen; Phosphorous; Nutrients.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1516/1/1480.pdf

Fifteen Years of Wheat Yield, N Uptake, and Soil Nitrate-N Dynamics in a Biosolids-Amended Agroecosystem. Agriculture, Ecosystems and Environment
Provedor de dados: 18
Autores: Barbarick, K.A.; Ippolito, J.A.; McDaniel, J.P.
Understanding N dynamics in biosolids-amended agroecosystems can help avoid over-application and the potential for environmental degradation. We investigated 15-years of biosolids application to dryland-wheat, questioning what is the relationship between cumulative grain yield and N uptake (N removal) and biosolids or N fertilizer rates and how many times biosolids or N fertilizer are applied? How are wheat-grain production and N uptake intertwined with residual soil nitrate-N? We found that biosolids or N fertilizer rates plus the number of applications of each material produced planar-regression (3-dimensional) models with 15-years of grain yield and N uptake data (all R2 &gt; 0.93). To evaluate how yield or N uptake impacted residual soil nitrate-N, we...
Tipo: Article
Palavras-chave: Dryland crops; Small grain; Nitrogen; Soil quality.
Ano: 2010
URL: http://eprints.nwisrl.ars.usda.gov/1404/1/1374.pdf

Improving nitrogen management for corn in southern Idaho and southwest Oregon
Provedor de dados: 18
Autores: Tarkalson, D.D.; Bjorneberg, D.L.; Hines, Steve.
Funding is being sought from multiple sources to update nitrogen fertilizer recommendations for irrigated corn in southern Idaho and southwest Oregon. This paper summarizes the justifications and main objectives of this proposed research. Nitrogen needs to be correctly managed in corn production systems to optimize economic returns and to protect the environment. The fertilizer nitrogen recommendations for irrigated field corn in Idaho and other parts of the Pacific need to be re-evaluated because: (1) University of Idaho (U of I) and PNW region recommendations are based on sparse research data; (2) Recommendation are based on research data that is over 25 years old; (3) Corn production area and yield have increased dramatically in concentrated areas due...
Tipo: Conference or Workshop Item
Palavras-chave: Application guidelines; Corn; Manure; Nitrogen.
Ano: 2014
URL: http://eprints.nwisrl.ars.usda.gov/1555/1/1511.pdf

Comparison of nitrogen fertilization methods and rates for subsurface drip irrigated corn in the semi-arid Great Plains
Provedor de dados: 18
Autores: Tarkalson, D.D.; Payero, J.O.
Tipo: Article
Palavras-chave: Fertility; Nitrogen.
Ano: 2008
URL: http://eprints.nwisrl.ars.usda.gov/1297/1/1274.pdf

Isotopic Nitrogen Fixation by Desert Algal Crust Organisms
Provedor de dados: 18
Autores: Mayland, H.F.
Please contact the NWISRL if you have a copy of this publication.
Tipo: Thesis
Palavras-chave: Nitrogen; Mass Import - autoclassified (may be erroneous).
Ano: 1965

Effects of tillage system and nitrogen supply on sugarbeet production
Provedor de dados: 18
Autores: Tarkalson, D.D.; Bjorneberg, D.L.; Moore, Amber.
The sugarbeet (Beta vulgaris L.) industry in Idaho is interested in strip tillage (ST) primarily due to the potential savings in tillage costs. This study was conducted to evaluate the use of strip tillage in Idaho compared to conventional tillage practices and to evaluate N requirements of sugarbeet under ST and conventional tillage.  The effect of tillage method (strip tillage, moldboard plow system [MP], and chisel plow system [CP]) and N supply (5 levels) on sugarbeet production factors were investigated in Kimberly, ID from 2008 to 2010 on a Portneuf silt loam with barley as the previous crop. Root and estimated recoverable sucrose (ERS) yields were the same under all three tillage practices.  However, estimated tillage costs for ST were from 53...
Tipo: Article
Palavras-chave: Sugarbeet; Tillage; Nitrogen.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1502/1/1465.pdf

Sugarbeet yield and quality when substituting compost or manure for conventional nitrogen fertilizer
Provedor de dados: 18
Autores: Lehrsch, G.A.; Brown, B.; Lentz, R.D.; Johnson-Maynard, J.L.; Leytem, A.B.
To profitably produce sugarbeet (Beta vulgaris L.) by maximizing recoverable sucrose, producers must effectively manage added nitrogen (N), whether it be from inorganic sources such as urea or from often readily available and sometimes less expensive organic sources such as manure or composted manure. Our multi-site study’s objective was to determine if equivalent sugarbeet root and sucrose yields could be achieved when substituting composted dairy cattle manure or stockpiled manure for conventional N (urea) fertilizer. Treatments at Site 1 (Parma, ID), for 2 y included a control (no N applied), urea (202 kg N/ha), compost (1089 and 2175 kg total N/ha), and manure (350 and 701 kg total N/ha). Treatments at Site 2 (Kimberly, ID), were a control, urea (82 kg...
Tipo: Article
Palavras-chave: Sugarbeet; Manure; Chemistry; Nitrogen; Soil.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1560/1/1516.pdf

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil
Provedor de dados: 83
Autores: Rocha,Adélia R. M.; Di Beneditto,Ana Paula M.; Pestana,Inácio A.; Souza,Cristina Maria M. de.
ABSTRACT The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ13C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ13C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ13C signature lighter (-23.9‰). The nitrogen (δ15N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon; Freshwater; Hg; Nitrogen; Trophic guilds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400723

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus
Provedor de dados: 83
Autores: Beneditto,Ana Paula Madeira Di; Bittar,Vanessa Trindade; Rezende,Carlos Eduardo de; Camargo,Plínio Barbosa; Kehrig,Helena Amaral.
This study applies total mercury (THg) concentration and stable isotope signature (δ15N and δ13C) to evaluate the trophic status and feeding ground of Trichiurus lepturus during its ontogeny in northern Rio de Janeiro, south-eastern Brazil. The trophic position of T. lepturus is detected well by THg and δ15N as the sub-adult planktivorous specimens are distinct from the adult carnivorous specimens. The δ13C signatures suggest a feeding ground associated with marine coastal waters that are shared by fish in different ontogenetic phases. The diet tracers indicated that the fish feeding habits do not vary along seasons of the year, probably reflecting the prey availability in the study area. This fish has economic importance and the concentration of THg was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon; Diet tracers; Nitrogen; Trace element; Trichiurus lepturus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100211

Nitrogen and phosphorus species of Lake Burullus Water (Egypt)
Provedor de dados: 20
Autores: Okbah, M.A.
Water samples collected from Lake Burullus were analyzed to investigate temporal and spatial variations of phosphorus and nitrogen species during the period from January to October 2003. The concentrations of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), particulate nitrogen (PN) and total nitrogen (TN) were in the ranges of 4.10-107.51mole l-1 ; 7.43-170.10mole l-1; 9.33-209.4mole l-1 and 51.40-259.0 mole l-1 respectively. DIN, DON and PN species represent 19%, 34% and 47% of the total nitrogen content, respectively. Significant variations for the concentrations of the phosphorus forms have been found in this study. Concentrations of reactive phosphate (PO4), dissolved organic phosphorus (DOP), particulate phosphorus (PP) and...
Tipo: Journal Contribution
Palavras-chave: Water samples; Water content; Nitrogen; Nutrients; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2005
URL: http://hdl.handle.net/1834/1263

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Romdhane, M.S.; Chebil Ajjabi, L.; El Abed, O.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel fisheries; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater treatment; Water quality; Mytilus galloprovincialis; Wastewater treatment; Mussels; Nutrients; Http://aims.fao.org/aos/agrovoc/c_31155; Http://aims.fao.org/aos/agrovoc/c_25312; Http://aims.fao.org/aos/agrovoc/c_5010; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2008
URL: http://hdl.handle.net/1834/4154

Compuestos de nitrógeno y fósforo en las aguas superficiales de tres zonas de la plataforma marina cubana
Provedor de dados: 20
Autores: Montalvo, J.F.; Perigó Arnaud, E.; Martínez, M.; García, I.; Esponda, S.C.; Cesar, M.E.; García, R.; López, D.; García, N.; Blanco, M.
Entre los años 1990 y 1991 se estudió el Golfo de Guacanayabo, desde 1998 hasta 2003 se evaluó el Golfo de Batabanó y el Archipiélago Sabana Camagüey fue investigado en la etapa 2001-2005, con el objetivo de evaluar los contenidos de nitrógeno y fósforo en estas tres regiones de la plataforma marina cubana y establecer las relaciones existentes entre ambos nutrientes. Los golfos de Guacanayabo y Batabanó poseen un mayor potencial de nitrógeno y fósforo que el ecosistema costero Sabana-Camagüey, debido al menor desarrollo de la red fluvial en este ecosistema, aunque en las tres regiones las concentraciones de estos compuestos están bajo una acentuada influencia antropogénica. La relación nitrógeno total-fósforo total N.T./P.T., mostró una tendencia a...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Nitrogen; Phosphorus; Man-induced effects; Archipelagoes; Eutrophication; Nitrogen; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2010
URL: http://hdl.handle.net/1834/3667

Compuestos de nitrógeno y fósforo en agua de algunas bahías del Archipiélago Sabana-Camagüey, Cuba.
Provedor de dados: 20
Autores: Montalvo, J.F.; García, I.; Loza, S.; Perigó, E.; Esponda, S.C.; Sánchez, M.; Barrier, A.
El Archipiélago Sabana – Camagüey es una de las regiones más estudiadas de la plataforma marina cubana. Entre los años 2001-2005 se evaluaron los contenidos de nitratos más nitrito, amonio, nitrógeno total, fósforo inorgánico y fósforo total, y se establecieron las relaciones nitrógeno total inorgánico &amp; fósforo inorgánico N/P y nitrógeno total &amp; fósforo total NT/PT, en las bahías de Cárdenas, Santa Clara Oeste, Puerto de Sagua la Grande, San Juan de los Remedios, Buenavista, Los Perros, Jigüey y La Gloria. El amonio fue la principal fuente de nitrógeno inorgánico y los contenidos de nitrógeno orgánico evidenciaron el predominio de los procesos de biosíntesis. Las relaciones N/P y NT/PT fueron superiores a 16:1 en la mayoría de las bahías...
Tipo: Preprint
Palavras-chave: Ammonium compounds; Nitrogen; Phosphorus; Bays; Nitrogen; Phosphorus; Ammonium compounds; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_351.
Ano: 2010
URL: http://hdl.handle.net/1834/3593

Primary carbon sources for juvenile penaeid shrimps in a mangrove-fringed Bay of Inhaca Island, Mozambique: a dual carbon and nitrogen isotope analysis
Provedor de dados: 20
Autores: Macia, A.
A study to estimate the relative importance of mangrove primary carbon and nitrogen sources to five commercial penaeid shrimps species was done at Saco da Inhaca, a non-estuarine mangrove-fringed bay on Inhaca Island, southern Mozambique. Carbon and nitrogen stable isotope ratios were determined in a variety of primary producers (mangroves, epiphytes, phytoplankton and seagrasses), sediments and in five penaeid shrimp species (Penaeus (Fenneropenaeus) indicus, P. japonicus, P. semisulcatus, Metapenaeus monoceros and M. stebbingi), collected within the bay in different habitats and during two different periods. The penaeid shrimps showed   13C values ranging from â  13 to â  19 â °, (average of â  15.6 Â± 0.4 â °, n=19) which is highly enriched compared to...
Tipo: Journal Contribution
Palavras-chave: PENAEUS INDICUS; METAPENAEUS MONOCEROS; METAPENAEUS STEBBINGI; PENAEUS  SEMISULCATUS; MARSUPENAEUS JAPONICUS; Shrimp culture; Nitrogen; Mangrove swamps; Carbon; Isotopes; Penaeid shrimp fisheries.
Ano: 2004
URL: http://hdl.handle.net/1834/1120

Assessment of nitrogen flows into the Cuban landscape
Provedor de dados: 20
Autores: Baisre, J. A.
The alteration of the nitrogen (N) cycle by human activities is widespread and has often resulted in increased flows of nitrogen to the marine environment. In this paper we have attempted to know the changes of N fluxes in Cuba by quantifying the N inputs to the landscape from (1) fertilizer applications, (2) atmospheric deposition, (3) biological nitrogen fixation and (4) net import of food and feeds. N-inputs to the country progressively increased until the end of the 20th century, reaching a peak during the 80s when low cost fertilizer imported from the former Soviet Union led to heavy rates of application. This rapid growth represented more than a 5-fold increase with respect to pristine values; higher than the two-fold global increase of anthropogenic...
Tipo: Journal Contribution
Palavras-chave: Nitrogen; Nitrogen cycle; Atmospheric deposition; Fertilizers.
Ano: 2006
URL: http://hdl.handle.net/1834/5111

Etude comparative de l’absorption de l’azote par deux espèces d’algues rouges : &lt;Gracilaria verrucosa&gt; (Hudson) papenfuss, 1950 et Gracilaria &lt;Bursa-pastoris&gt; (gmelin) silva, 1952.
Provedor de dados: 20
Autores: Romdhane, M.S.; Chebil-Ajjabi, L.; El Abed, A.
Afin de mettre en évidence l’aptitude de deux espèces d’algues rouges Gracilaria verrucosa et Gracilaria bursa-pastoris pour le traitement des effluents et leur utilisation potentielle, une série d’expériences a été réalisée ayant pour but d’expliquer le comportement de ces deux espèces d’algues vis à vis de la source d’azote.  Dans une première expérience, on a pu déterminer la forme d’azote (N-NH4 , N-NO3) preférentielle pour chacune des deux espèces d’algues cultivées séparément. Elles ont une nette préférence pour N-NH4 et cela pour une même concentration initiale. Cependant, G. verrucosa  est  un candidat plus performant que G. bursa-pastoris pour l’assimilation des deux formes d’azote. Etant identifié comme source préférentielle, N-NH4 a été utilisé...
Tipo: Journal Contribution
Palavras-chave: Adsorption; Algal culture; Nitrogen; Nutrients (mineral); Wastewater treatment; Adsorption; Nitrogen; Algal culture; Wastewater treatment; Http://aims.fao.org/aos/agrovoc/c_137; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_31892; Http://aims.fao.org/aos/agrovoc/c_25312.
Ano: 2005
URL: http://hdl.handle.net/1834/3776

Essai d'évaluation de la qualité des eaux de ruissellement du bassin versant de la lagune de Bizerte
Provedor de dados: 20
Autores: Hammami, J.; Brahim, M.; Gueddari, M.
:تقع بحيرة بنزرت في الشمال التونسي وتغذيها عدة أودية تنبع من حوض يمتد على مساحة شاسعة. وتمثل التقلبات المناخية والأنشطة الإقتصادية المتزايدة في السنوات الأخيرة أهم العوامل المؤثرة في هذا الحوض وفي السيول التي تنبع منه في اتجاه البحيرة.  لقد قمنا في شهر فيفري في سنة 2003 باقتـاء عينات من الماء مـن 15 مصـب لتحليلـها ( درجة الحرارة، درجة الحموضة، نسبة الأكسجين، الكلوروفيل والمواد العضوية والمعدنية الأزوتية والفسفورية) قصد دراسة هذه الظاهرة.  وبينت النتائج التي تم الحصول عليها بأن مياه روافد بحيرة بنزرت تتميز عموما بنسبة عالية للأكسجين وبدرجة حموضة عادية إلى مرتفعة نوعا ما. لكن مياه مصب وادي المرازيق وقنيش والذين يقعان بالتوالي في الشمال الغربي والجنوب الشرقي للبحيرة محملا بأكثر نسبة من المواد الأزوتية والفسفورية. تظهر هذه النتيجة واضحة في التحاليل الإحصائية...
Tipo: Journal Contribution
Palavras-chave: Runoff; Anthropogenic factors; Chlorophylls; Physical properties; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Anthropogenic factors; Chlorophylls; Physical properties; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005
URL: http://hdl.handle.net/1834/1533

Concentraciones de nutrientes y eutrofización en arrecifes coralinos de los archipiélagos Los Canarreos y Sabana-Camagüey
Provedor de dados: 20
Autores: Montalvo, J.F.; Perigó, E.
Coral reefs are very sensitive to the increment in nitrogen concentrations and phosphorus, since these compounds propitiate the macroalgae growth, resulting in the degradation of coral reefs. With the purpose of assessing the degree of nutriphication of the coral reefs in Los Canarreos Archipelago, located in the periphery of the Gulf of Batabanó, and those located in the outer area of Sabana-Camagüey Archipelago (SCA), three samplings were executed in the reefs of Los Canarreos Archipelago (August 1999, March 2000 and August 2000). In SCA, samplings were done in May 2002 and August 2003. The parameters evaluated were nitrates + nitrite, ammonium, total nitrogen, inorganic phosphorus and total phosphorus. The nutrient contents in the reefs located in the...
Tipo: Proceedings Paper
Palavras-chave: Coral reefs; Eutrophication; Nutrients (mineral); Nitrogen; Phosphorus; Coral reefs; Eutrophication; Nitrogen; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2006
URL: http://hdl.handle.net/1834/2084

Caracterización química de los sedimentos superficiales de las bahías de Cárdenas y Santa Clara, Archipiélago Sabana-Camagüey, Cuba.
Provedor de dados: 20
Autores: Montalvo, J. F.
Los sedimentos superficiales de las bahías de Cárdenas y Santa Clara fueron muestreados en mayo de 2002 y julio de 2005, evaluándose los parámetros orgánicos e inorgánicos que tienen mayor peso en los ciclos biogeoquímicos (carbón, nitrógeno, fósforo, carbonatos, sulfuro de hidrógeno y consumo de oxidante químico). Los sedimentos de las bahías de Cárdenas y Santa Clara, poseen notables contenidos de carbón orgánico y concentraciones de nitrógeno inferiores a 0,2 %, evidenciando que la fuente principal de materia orgánica en estos cuerpos de agua es la vegetación periférica y acuática, rica en carbono y pobre en nitrógeno. En estas bahías las concentraciones promedio de carbonatos son superiores al 35 %, aunque la mayor riqueza corresponde a la bahía de...
Tipo: Journal Contribution
Palavras-chave: Sediments; Organic carbon; Nitrogen; Hydrogen sulphide; Bays; Nitrogen; Hydrogen sulphide; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_15986.
Ano: 2006
URL: http://hdl.handle.net/1834/3342

Caractérisation hivernale de la lagune de Bizerte
Provedor de dados: 20
Autores: Bejaoui, B.; Ben Charada, R.; Moussa, M.; Ben Hamadou, R.; Harzallah, A.; Chapelle, A.
Ce travail porte sur la caractérisation hivernale de la lagune de Bizerte en se basant sur une campagne de mesures effectuée en janvier 2004. Cette campagne a porté sur 17 stations réparties sur toute la lagune ainsi qu’une station marine de référence. Chaque échantillon a fait l’objet de mesures in-situ (Température, Salinité, Conductivité, Transparence, Acidité et Oxygène dissous) et des analyses au laboratoire (NO3, NO2, NT, PO4, Chlorophylle-a, Phéopigment et MES). Cette étude a montré que la distribution spatiale des paramètres est fortement liée aux apports fluviaux. Contrairement au phosphore minéral, la teneur en azote total montre une variation spatiale importante. L’analyse de la distribution spatiale des nutriments d’une part et de la...
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Hydrobiology; Nitrogen; Nutrients (mineral); Phosphorus; Phytoplankton; Geographical distribution; Nitrogen; Phosphorus; Phytoplankton; Hydrobiology; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_3718.
Ano: 2005
URL: http://hdl.handle.net/1834/3748

Essai d’évaluation de la qualite des eaux de ruissellement du bassin versant de la lagune de Bizerte
Provedor de dados: 20
Autores: Hammami, J.; Brahim, M.; Gueddari, M.
La lagune de Bizerte, située en Tunisie nord-orientale, constitue un bassin récepteur d’un réseau hydrographique bien développé. Afin d’apprécier l’impact des facteurs naturels et anthropiques sur les eaux de ruissellement du bassin versant de cette lagune, une campagne de prélèvement d’eau a été effectuée en février 2003 (période de crue) au niveau de la partie aval de quinze cours d’eau, à raison d’un échantillon par cours d’eau. Les échantillons d’eau prélevés ont fait l’objet de mesure in situ des variables physico-chimiques (température, pH et O2 dissous) et d’analyses au laboratoire de la chlorophylle a et des différentes formes organiques et inorganiques dissoutes de l’azote et du phosphore. Les résultats obtenus ont montré que les eaux de...
Tipo: Journal Contribution
Palavras-chave: Anthropogenic factors; Chemical properties; Chlorophylls; Nitrogen; Phosphorus; Physical properties; Pollution monitoring; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chlorophylls; Anthropogenic factors; Physical properties; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005
URL: http://hdl.handle.net/1834/3747

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Chebil Ajjabi, L.; Romdhane, M.S.; El Abed, A.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel culture; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater recycling; Wastewater treatment; Water quality; Fish; Nitrogen; Phosphorus; Water quality; Mussels; Nutrients; Bacteria; Chlorophylls; Density; Effluents; Filtration; Wastewater treatment.
Ano: 2008
URL: http://hdl.handle.net/1834/3756

Preliminary Observations on Livestock Productivity in Sheep Fed Exclusively on Haulms from Eleven Cultivars of Groundnut
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Body weight; Groundnuts; Organic matter; Viruses; Aromatic compounds; Nitrogen; Germplasm; Metabolism; Quality; Biological phenomena.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3255

Linking Biological Nitrogen fixtation Research in Asia
Provedor de dados: 30
Autores: O.P.
Palavras-chave: Nitrogen fixation; Rhizobium; Pigeonpeas; Chickpeas; Root nodulation; Nitrogen; Legumes; Electrophoresis; Soybeans.
Ano: 1994
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4659

Standardization of nitrogen fertilizer rate for sugar yield optimization in sweet sorghum
Provedor de dados: 30
Autores: Reddy, P.S.,( P. Sanjana Reddy ).
Palavras-chave: Genotypes; Topdressing; Nitrogen fertilizers; Sorghum; Carbohydrates; Confectionery; Alcohols; Yields; Replication; Nitrogen.
Ano: 2008
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3145

THE ELEUSINES (A Review of the World Literature)
Provedor de dados: 30
Palavras-chave: Millets; Grain; Amino acids; Inorganic acid salts; Chromosomes; Nitrogen; Calcium; Sorghum; Pigments.
Ano: 2023
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3957

Genotype × environment interactions in food-feed traits in Pearl Millet cultivars
Provedor de dados: 30
Autores: Hash, C.T.
Palavras-chave: Nutritive value; Millets; Grain; Heritability; Yields; Quality; Location; Nitrogen; Plant production; Arid zones.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3209

Morphological, chemical and in vitro stover quality traits to predict the livestock productivity potential of pearl millet stover
Provedor de dados: 30
Autores: Alexander, G.
Palavras-chave: Millets; Nitrogen; Leaf area; Cell walls; Statistical methods; Organic matter; Forecasting; Nutritive value; Quality; Statistics.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3310

Morphological diversity in finger millet germplasm introduced from Southern and Eastern Africa
Provedor de dados: 30
Autores: Upadhyaya, H.D.,( Hari D. Upadhyaya ).
Palavras-chave: Millets; Pigments; Germplasm; Genetic resources; Grain; Plant habit; Sorghum; Inorganic acid salts; Tropical zones; Nitrogen.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3303

Fertilizer Use in Semi-Arid Tropical India
Provedor de dados: 30
Autores: Jha, D.
Palavras-chave: Millets; Sorghum; Nitrogen; Crops; Hybrids; Organic fertilizers; Area; Mixed cropping; Arid zones.
Ano: 2023
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3755

Molecular genetic relationships among Arachis diogoi and A. chiquitana accessions
Provedor de dados: 30
Autores: Mallikarjuna, N.,( Nalini Mallikarjuna ).
Palavras-chave: DNA; Polymorphism; RAPD; Genotypes; Locus; Genetic structures; Groundnuts; Hybrids; Nitrogen; Mass media.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3294

Stover fodder quality traits for dual-purpose sorghum genetic improvement
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Nitrogen; Sorghum; Organic matter; Body weight; Bioreactors; Genetic improvement; Sampling; Aromatic compounds; Forecasting; Metabolism.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3197

A Review of Fertilizer Use Research on Sorghum in India
Provedor de dados: 30
Autores: H.L.S. ( compiler and editor ).
Palavras-chave: Sorghum; Genetic soil types; Fertilizers; Hybrids; Grain; Nitrogen; Genotypes; Inorganic acid salts; Soil analysis.
Ano: 1984
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4028

Response to recurrent selection for stover feeding value in pearl millet variety ICMV 221
Provedor de dados: 30
Autores: Bidinger, F.R.
Palavras-chave: Nitrogen; Grain; Recurrent selection; Random mating; Millets; Cell walls; Yields; Body weight; Replication; Aromatic compounds.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3204

Forage yield and quality in pigeonpea germplasm lines
Provedor de dados: 30
Autores: Alexander, G.
Palavras-chave: Pigeonpeas; Organic acids; Animal nutrition; Heritability; Nitrogen; Germplasm; Wet season; Dry matter; Organic matter; Biological phenomena.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3284

Food-fodder traits in groundnut
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Genotypes; Nutritive value; Groundnuts; Forecasting; Nitrogen; Yields; Organic matter; Sampling; Quality; Breeds (animals).
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3246

Nitrogen Nutrition of Groundnut in Alfisols
Provedor de dados: 30
Autores: P.T.C.
Palavras-chave: Root nodulation; Groundnuts; Nitrogen fixation; Genotypes; Rhizobium; Bacteria; Nitrogen; Enzymes; Application methods; Legumes.
Ano: 1990
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4084

Evaluation of farmer-grown improved sorghum cultivars for stover quality traits
Provedor de dados: 30
Autores: Reddy, K.G.,( K. Gurava Reddy ) Ramesh, S.
Palavras-chave: Sorghum; Pigeonpeas; Nitrogen; Genotypes; Statistical methods; Crude protein; Farmers associations; Sampling; Grain; Nutritive value.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3239

Protein digestion in juvenile turbot (&lt;i&gt;Scophthalmus maximus&lt;/i&gt;) and effects of dietary administration of &lt;i&gt;Vibrio proteolyticus&lt;/i&gt;
Provedor de dados: 27
Autores: De Schrijver, R.; Ollevier, F.P.
The trial was made to study the protein digestion in juvenile turbot during passage of digesta from stomach to rectum. Moreover, diet supplementation with the potential probiotic bacteria, &lt;i&gt;Vibrio proteolyticus&lt;/i&gt;, was evaluated with regard to protein digestion. For a 3-week period, fish (25-30 g) were fed by oral intubation and received either a liquid mixture consisting of 40% nonpurified control diet and 60% water or this mixture supplemented with 10 &lt;sup&gt;10&lt;/sup&gt; viable &lt;i&gt;V. proteolyticus&lt;/i&gt; ml &lt;sup&gt;-1&lt;/sup&gt;. Daily dry matter was 1.5% body weight. As digesta progressed from the stomach to the foregut, hindgut and rectum, the increase in apparent nitrogen digestibility was accompanied by higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture; Diets; Digestibility; Digestion; Feeding experiments; Fish culture; Food conversion; Nitrogen; Probiotics; Probiotics; Proteins; Scophthalmus maximus; Stomach; Scophthalmus maximus; Vibrio proteolyticus.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=9593

Sintomas de deficiência nutricional de macronutrientes em mudas de Khaya ivorensis cultivadas em solução nutritiva
Provedor de dados: 190
Autores: Corcioli, Graciella; Borges, Jácomo Divino; de Jesus, Roberta Paula.
O mogno africano (Khaya ivorensis) é uma essência florestal de alto valor no comércio internacional e de grande potencial para substituir o mogno brasileiro (Swietenia macrophylla). Atualmente, pouco se conhece a respeito das exigências nutricionais do mogno africano. Assim, o presente trabalho teve por objetivo induzir sintomas visuais de deficiência de macronutrientes (nitrogênio, fósforo e potássio) em mudas de mogno africano. Para isso, realizou-se um experimento com solução nutritiva, com os tratamentos: T1-Solução completa; T2-com omissão de N; T3-com omissão de P; T4-com omissão de K e T5-Água deionizada. Os sintomas de deficiências de macronutrientes em mudas de mogno africano foram evidentes, comprometendo o desenvolvimento das mudas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrição Mineral; Recursos Florestais Mogno africano; Nitrogênio; Fósforo; Potássio African mahogany; Nitrogen; Phosphorus; Potassium.
Ano: 2014
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/641

Variations on the nutritional status of eucalypt as influenced by the genetic material and age of tree
Provedor de dados: 86
Autores: Wadt,Paulo Guilherme Salvador; Novais,Roberto Ferreira de; Alvarez,Victor Hugo; Barros,Nairam Félix de; Dias,Luiz Eduardo.
The Diagnosis and Recommendation System (DRIS) was applied to eucalypt trees (hybrids of Eucalyptus grandis x E. urophylla) with different ages and growing under different environmental conditions for three different clones. The basic data were obtained from 1,986 trees of commercial stands cultivated in the states of Espírito Santo and south Bahia, Brazil. The DRIS indices were calculated using the Beaufils' Range formula and grouped according to the Nutrient Application Potential Response method. The objective of this paper was to evaluate the N, P and Ca status in eucalypt trees, regarding the tree ages and genetic materials. The DRIS indices discriminated differences in the nutritional status of the trees, both in relation to age and the genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DRIS; Coefficient of nutrient utilization; Nitrogen; Phosphorus; Calcium; Eucalyptus grandis; Eucalyptus urophylla.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001000005

Chemical composition of cactus pear cladodes under different fertilization and harvesting managements
Provedor de dados: 86
Autores: Gomes,Gil Mario Ferreira; Cândido,Magno José Duarte; Lopes,Marcos Neves; Maranhão,Theyson Duarte; Andrade,Dhones Rodrigues de; Costa,Jander Fabrício Martins; Silveira,Walisson Marques; Neiva,José Neuman Miranda.
Abstract: The objective of this work was to evaluate the effects of combined phosphorus and nitrogen fertilization and of harvesting frequency on the chemical composition of 'Gigante' cactus pear (Opuntia ficus-indica) cladodes. The experiment was carried out in two municipalities, Quixadá and Tejuçuoca, in the state of Ceará, Brazil. Fertilization with nitrogen (urea) and phosphorus (single superphosphate) was done with nine doses, respectively: 10 and 70, 70 and 10, 70 and 70, 70 and 130, 100 and 100, 130 and 70, 130 and 130, 130 and 190, and 190 and 130 kg ha-1 per year, besides 100 kg ha-1 N and P2O5 per year as the control. The harvesting frequencies evaluated were annual and biannual. A randomized complete block design was adopted, in split plot,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Opuntia ficus-indica; Harvesting frequency; Nitrogen; Phosphorus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000200221

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time
Provedor de dados: 86
Autores: Nascente,Adriano Stephan; Crusciol,Carlos Alexandre Costa; Cobucci,Tarcísio.
The objective of this work was to evaluate the effect of cover crops and their desiccation times on upland rice yield and on the levels of nitrate and ammonium in a no-tillage soil. The experiment was carried out in a randomized blocks, with split plots and three replicates. Cover crops (plots) were sowed in the off-season (March 2009). In November 2009, at 30, 20, 10 and 0 days before rice sowing (split plots), herbicide was applied on the cover crops (fallow, Panicum maximum, Urochloa ruziziensis, U. brizantha and millet). Straw and soil were sampled (0 - 10 cm) at the sowing day, and after 7, 14, 21, 28 and 35 days. Straws from millet and fallow were degraded more rapidly and provided the lowest level of nitrate in the soil. Urochloa ruziziensis, U....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Panicum maximum; Urochloa brizantha; Urochloa ruziziensis; Millet; Nitrogen.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001200004

Arabica coffee response to rates of coated and conventional urea in sandy soil
Provedor de dados: 86
Autores: Abranches,Jorge Luiz; Soratto,Rogério Peres; Perdoná,Marcos José; Parecido,Renan José.
Abstract: The objective of this work was to evaluate the growth, relative chlorophyll index and nitrogen concentrations in leaves, and the grain yield of arabica coffee (Coffea arabica) fertilized with rates of N as coated and conventional urea, in a sandy soil under rainfed conditions. The experiment was carried out over three crop years, using 'Mundo Novo IAC 388-17-1' coffee, in a randomized complete block design, in a 3×2+1 factorial arrangement, with three treatments with 150, 300, and 600 kg ha-1 N, as coated and conventional urea, and a control without N, with six replicates. Nitrogen increased stem diameter, plant height, N concentrations and relative chlorophyll index in the leaves, as well as grain yield. Over the three crop years, the highest N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Grain yield; Mineral nutrition; Nitrogen; Slow release.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102101

Factors affecting the attack rate of Bemisia tabaci on cucumber
Provedor de dados: 86
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Guedes,Raul Narciso Carvalho; Ecole,Carvalho Carlos.
The objective of this work was to determine the effects of rainfall, temperature, predators, parasitoids, plant age, leaf chemical composition, levels of leaf nitrogen and potassium, besides density of leaf trichomes, on attack intensity of Bemisia tabaci biotype B on the Cucumis sativus. An increase in the number of whitefly adults and nymphs per leaf was observed with plant aging. A higher number of whitefly adults per leaf and eggs cm-2 was verified in the apical part than in the middle and bottom part of the plants canopy. However, the higher number of whitefly nymphs was observed in the mid-part than in the apical and bottom part of the plant canopy. The incidence of whitefly nymphs was negatively affected with foliar nitrogen. Pentacosane and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Whitefly; Allelochemicals; Nitrogen; Trichomes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000800005

Reduction of crude protein in diets fed to lactating Holstein-Gyr cows
Provedor de dados: 86
Autores: Guimarães,Clóvis Ribeiro; Azevedo,Rafael Alves de; Campos,Mariana Magalhães; Machado,Fernanda Samarini; Pedroso,Alexandre Mendonça; Carvalheira,Luciano de Rezende; Tomich,Thierry Ribeiro; Pereira,Luiz Gustavo Ribeiro; Coelho,Sandra Gesteira.
Abstract: The objective of this work was to evaluate the effect of reducing crude protein (CP) contents in diets with a constant metabolizable protein content on the intake, performance, nitrogen balance, and nutrient digestibility of lactating Holstein-Gyr cows. Animals (n = 24, 103±23 days in milk) were allocated to four treatments (n = 6 per group) with different CP contents: 127, 132, 139, and 156 g kg-1 dry matter (DM). DM intake was not affected by treatments. CP intake and digestibility increased linearly with higher CP contents. Milk yield (23.7±3 kg per day) and the percentages of milk protein (3.3±0.2%) and fat (3.8±0.5%) were not affected by CP reduction. Milk and blood urea nitrogen increased linearly with the increase of CP in the diet,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Protected soybean meal; Soypass; Urea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700858

Nitrogen fertilization in consecutive cycles and its impact on high-density peach crops
Provedor de dados: 86
Autores: Ferreira,Letícia Vanni; Picolotto,Luciano; Pereira,Ivan dos Santos; Schmitz,Juliano Dutra; Antunes,Luis Eduardo Corrêa.
Abstract: The objective of this work was to evaluate the effect of nitrogen fertilization on the mineral composition of leaves, initial growth, and yield of peach (Prunus persica) tree advanced selections grown at a high-planting density. The experiment was carried out between 2012 and 2015 in a randomized complete block design, with a combination of advanced selections of the 'Cascata 1513' and 'Cascata 1067' peach trees and of N fertilization doses (0, 30, 60, and 120 kg ha-1 N). Green weight after pruning, diameter, and increase of trunk diameter, canopy volume, plant height, branch length, number of buds per centimeter of shoot, chlorophyll index, leaf area, rust incidence, average production, number of fruit, and mass of fruit were evaluated. Genotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Growth; Nitrogen; Nutrition; Planting density.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000200172

Maintenance requirement and deposition efficiency of lysine in pigs
Provedor de dados: 86
Autores: Ceron,Marcos Speroni; Oliveira,Vladimir de; Lovatto,Paulo Alberto; Vale,Marcos Martinez do.
The objective of this work was to determine the maintenance requirement and the deposition efficiency of lysine in growing pigs. It was used the incomplete changeover experimental design, with replicates over time. Twelve castrated pigs with average body weight (BW) of 52±2 kg were kept in metabolism crates with a controlled temperature of 22ºC. The diets were formulated to supply 30, 50, 60, and 70% of the expected requirements of standardized lysine, and provided at 2.6 times the energy requirements for maintenance. The trial lasted 24 days and was divided into two periods of 12 days: seven days for animal adaptation to the diet and five days for sample collection. The increasing content of lysine in the diet did not affect dry matter intake of the pigs....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acid requirement; Nitrogen; Pig production; Swine nutrition.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000900011

N-partitioning, nitrate reductase and glutamine synthetase activities in two contrasting varieties of maize
Provedor de dados: 86
Autores: Machado,Altair Toledo; Sodek,Ladaslav; Fernandes,Mânlio Silvestre.
In order to identify useful parameters for maize genetic breeding programs aiming at a more efficient use of N, two maize varieties of contrasting N efficiency, Sol da Manhã NF (efficient) and Catetão (inefficient) were compared. Experiments were carried out under field and greenhouse conditions, at low and high N levels. The parameters analysed included total and relative plant and grain N content, biomass and the activities of nitrate reductase and glutamine synthetase in different parts of the plant. It was found that the translocation efficiency of N and photoassimilates to the developing seeds and the source-sink relations were significantly different for the two varieties. N content of the whole plant and grain, cob weight and the relative ear dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient transport; Nitrogen; Grain; Source sink relations; Plant breeding.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000200006

Nitrogen deposition influences the response of Potentilla tanacetifolia to phosphorus addition
Provedor de dados: 85
Autores: Yang,G; Zhang,Z; Zhang,G; Zhang,H; Han,X; Busso,CA.
Phosphorus is an essential macronutrient for all living plants and plant production. Simultaneously, atmospheric nitrogen deposition also affects plant productivity at a global scale. However, few studies have investigated how plants respond to P addition while simultaneously considering N deposition. We investigated plant biomass, nutrient status and stoichiometric ratios on Potentilla tanacetifolia in response to P fertilization under contrasting N addition rates in a typical meadow steppe in Inner Mongol ia, China. Aboveground biomass of P. tanacetifolia increased under increasing levels of P fertilization under conditions of N addition. However, there was no significant change in biomass when only phosphorus was added. Plant leaf and stem P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Phosphorus; N: P ratio; Plant organs.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100014

Biosynthesis of proline in fruits of green bean plants: deficiency versustoxicity of nitrogen
Provedor de dados: 85
Autores: Sánchez,E; Ávila-Quezada,G; Gardea,AA; Ruiz,JM; Romero,L.
The objective of this work was to determine the effect of deficiency versus toxicity of N on biosynthesis of proline in fruits of green bean plants (Phaseolus vulgaris L. cv. Strike). Nitrogen was applied to the nutritive solution in the form of NH4NO3 at 1.5 mM (N1), 3.0 mM (N2), 6.0 mM (N3, optimal level), 12.0 mM (N4), 18.0 mM (N5), and 24.0 mM (N6). Nitrogen deficiency (N1 and N2) was characterized by having lower proline accumulation in pods and seeds, mainly because proline degradation was stimulated by the enzyme proline dehydrogenase. On the other hand, N toxicity (N4, N5, and N6) was characterized for accumulation of greater amounts of proline in pods and seeds due primarily to the greater activity of the enzyme...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L; Proline metabolism; Green bean; Nitrogen; Deficiency; Toxicity.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100013

Influence of Nitrogen Fertilization on Herbicide Selectivity in Rice
Provedor de dados: 87
Autores: LANGARO,A.C.; AGOSTINETTO,D.; OLIVEIRA,C.; FRANCO,J.J.; ZANDONÁ,R.R.; VARGAS,L.
ABSTRACT: Chemical weed control and nitrogen fertilization are common practices in irrigated rice crops. Nitrogen is an essential element for growth and development of plants and may influence herbicide selectivity. In this study, herbicide selectivity was evaluated according to nitrogen application time in irrigated rice crops. The experiment was conducted in the field in a split-plot design with four replications. Treatments were arranged in a factorial scheme: factor A consisted of different nitrogen application times (without nitrogen, all nitrogen applied before flooding, half of the nitrogen rate applied before flooding and the other half after flooding, all nitrogen applied after flooding); factor B consisted of the application of the herbicides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Nitrogen; Selectivity; Weeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100318

COMPETITION BETWEEN WHEAT AND RYEGRASS UNDER DIFFERENT LEVELS OF NITROGEN FERTILIZATION
Provedor de dados: 87
Autores: AGOSTINETTO,D.; TAROUCO,C.P.; LANGARO,A.C.; GOMES,J.; VARGAS,L.
ABSTRACT The main limiting factors for the productive potential of wheat crops are related to the competition with weeds for resources such as water, light and nutrients. Nitrogen (N) is an important nutrient used to maintain crop productivity, as well as promoting the competitive ability of crops and therefore suppress the weed growth. In this context, the goal of this study was to evaluate the effects of wheat plants in competition with ryegrass under different levels of nitrogen fertilization. Treatments were arranged in a factorial design, where factor A consisted in nitrogen rates (0, 60, 120, 180 and 240 kg ha-1) and factor B consisted in ryegrass and wheat plants ratios, which were: 100/0 (pure stand of 64 wheat plants), 50/50 (32 wheat plants and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Replacement series; Triticum aestivum; Lolium multiflorum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100247

EVALUATING THE RETURNS TO VARIABLE RATE NITROGEN APPLICATION
Provedor de dados: 31
Autores: Roberts,   Roland K.; English,   Burton C.; Mahajanashetti,   S.B.
Potential benefits of variable rate nitrogen application are illustrated and information needs identified. Lower costs of precision farming services, higher crop prices, and greater divergence in yield response potentials across management zones reduce the spatial variability required for profitable variable rate application. Information needs include identification and measurement of management zones within a field and estimation of management zone yield response functions, crop and input prices, and the cost of precision farming services.
Tipo: Journal Article
Palavras-chave: Production economics; Management zones; Nitrogen; Precision farming; Spatial break-even variability proportions; Variable rate applications; Yield response variability; Crop Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/15393

How much can be gained by optimizing nutrient abetment spatially – Cost – efficiency comparison of non – point arable loads from different Finnish watersheds
Provedor de dados: 31
Autores: Helin,   Janne; Tattari,   Sirkka.
Targeting has become the buzz word in the national agri-environmental policy reform in Finland. It is generally accepted that more environmental benefits could be reaped by implementing environmental protection measures where they have the biggest positive impact. However, considering one of the main environmental problems in Finland resulting from agriculture, eutrophication, the identification of first-best policy or even the biggest contributors among the diffuse nutrient sources remains as a considerable challenge. The model developed in this study aims to demonstrate how the agricultural nutrient load potential can be calculated in a way which supports the identifying of cost-efficient abatement policies. We use metamodeling of dynamic nutrient load...
Tipo: Conference Paper or Presentation
Palavras-chave: Nutrient abatement; Nitrogen; Phosphorus; Non-linear optimization; GIS; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Land Economics/Use; Productivity Analysis.
Ano: 2010
URL: http://purl.umn.edu/109381

ECONOMICS OF TRADE-OFF BETWEEN UREA NITROGEN AND POULTRY LITTER FOR RICE PRODUCTION
Provedor de dados: 31
Autores: Govindasamy,   Ramu; Cochran,   Mark J.; Miller,   David M.; Norman,   Richard J.
This paper identifies optimal combinations of nitrogen in the form of urea, fresh litter and composted litter for rice production.  Traditional cost minimization techniques using data from experimental results conducted at three sites in Arkansas during 1991 have been employed.  Comparisons between different scenarios indicate that the trade-off between the use of poultry litter and urea nitrogen depends on such factors as soil fertility, the yield response to litter application and the relative prices of nitrogen and litter.  The use of litter is more economical at high target yields than at low target yields.
Tipo: Journal Article
Palavras-chave: Poultry litter; Nitrogen; Rice; Programming; Crop Production/Industries.
Ano: 1994
URL: http://purl.umn.edu/15180

A Risk Analysis of Carbon Sequestration in Claypan Soil with Conservation Tillage Systems and Nitrogen Fertilizers for Grain Sorghum and Soybean
Provedor de dados: 31
Autores: Williams,   Jeffery R.; Pendell,   Dustin L.; Sweeney,   Daniel; Rice,   Charles W.; Nelson,   Richard G.
Replaced with revised version of paper 02/15/06.
Tipo: Conference Paper or Presentation
Palavras-chave: Carbon sequestration; Carbon credits; Nitrogen; Risk; Tillage; Crop Production/Industries; Risk and Uncertainty; Q12.
Ano: 2005
URL: http://purl.umn.edu/35327

Establishing a Baseline for Nitrogen Policy Assessment
Provedor de dados: 31
Autores: Livingston,   Michael J.; Ribaudo,   Marc.
Tipo: Conference Paper or Presentation
Palavras-chave: Nitrogen; Nitrogen use efficiency; Nitrogen management; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/60925

Optimal Switchgrass Harvest Strategies Accounting for Yield and Nitrogen Requirement Differences by Month of Harvest
Provedor de dados: 31
Autores: Haque,   Mohua; Epplin,   Francis M.
Extending switchgrass harvest over many months would require a smaller investment in harvest machines, but would result in a lower average harvestable yield per acre and would require more nitrogen fertilizer, less land for storage, and more land for growing switchgrass.  A model was constructed and solved to determine the optimal strategy.
Tipo: Conference Paper or Presentation
Palavras-chave: Biofuel; Cellulosic; Ethanol; Harvest; Mathematical programming; Nitrogen; Switchgrass; Crop Production/Industries; Resource /Energy Economics and Policy; Q10; Q42.
Ano: 2010
URL: http://purl.umn.edu/56435

Effects of Alternative Lime Application Rates on Cotton Profitability with Varying Cover Crops, Nitrogen, and Tillage Methods.
Provedor de dados: 31
Autores: Cochran,   Rebecca L.; Larson,   James A.; Roberts,   Roland K.; Tyler,   Donald D.
Soil acidity and cotton yields are influenced by cover crop, nitrogen, and tillage method.  Applying half the recommended lime rate may be possible without reducing cotton yields.  Using a nitrogen intensive cover crop and applying less nitrogen should mitigate the effects on soil acidity and yields.
Tipo: Conference Paper or Presentation
Palavras-chave: Cover crops; Cotton; Lime; Nitrogen; Profitability; Soil acidity; Tillage; Crop Production/Industries.
Ano: 2005
URL: http://purl.umn.edu/35569

Determining Optimal Levels of Nitrogen Fertilizer Using Random Parameter Models
Provedor de dados: 31
Autores: Tumusiime,   Emmanuel; Brorsen,   B. Wade; Mosali,   Jagadeesh; Johnson,   Jim; Locke,   James; Biermacher,   Jon T.
The parameters of yield response functions can vary by year. Past studies usually assume yield functions are nstochastic  ‘‘limited’’ stochastic. In this study, we estimate rye– ryegrass yield functions in which all parameters are random. The three functional forms considered are the linear response plateau, the quadratic, and the Spillman-Mitscherlich. Nonstochastic yield models are rejected in favor of stochastic parameter models. Quadratic functional forms fit the data poorly. Optimal nitrogen application recommendations are calculated for the linear response plateau and Spillman-Mitscherlich. The stochastic models lead to smaller recommended levels of nitrogen, but the economic benefits of using fully stochastic crop yield functions are small because...
Tipo: Journal Article
Palavras-chave: Cereal rye–ryegrass; Monte Carlo; Nitrogen; Random parameters; Stochastic plateau; Production Economics; Q10; C12; D24.
Ano: 2011
URL: http://purl.umn.edu/117949

Precision Feeding in Dairy Ration Cost Minimization Under Producer's Risk Management
Provedor de dados: 31
Autores: Salim,   Juma K.; Dillon,   Carl R.
The biophysical simulation data from Cornell Net Carbohydrate and Protein System were used in non-linear programming model for least cost ration incorporating ingredient nutrient and price variations. Precision feeding practice indicated to have lower mean cost ration than whole herd feeding in terms of ration cost.
Tipo: Conference Paper or Presentation
Palavras-chave: Non-linear programming; Nutrient variation; Price variation; Precision feeding; Environmental pollution; Phosphorus; Nitrogen; Mean cost ration; Whole herd feeding; Livestock Production/Industries; Risk and Uncertainty.
Ano: 2007
URL: http://purl.umn.edu/34925

IMPACTS OF WITHIN-FARM SOIL VARIABILITY ON NITROGEN POLLUTION CONTROL COSTS
Provedor de dados: 31
Autores: Vandyke,   Laura S.; Bosch,   Darrell J.; Pease,   James W.
The effects of considering variable within-farm soil runoff and leaching potential on costs of reducing nitrogen losses are analyzed for a Virginia dairy.  Manure applications may cause nitrogen losses through runoff and leaching because of factors such as uncertain nitrogen mineralization.  Farmers can reduce nitrogen control costs by applying manure on soils with less nitrogen loss potential.  Ignoring within-farm soil variability may result in overstating the farm's costs of reducing nitrogen losses.
Tipo: Journal Article
Palavras-chave: Economic costs; Linear programming; Manure; Nitrogen; Nutrient management; Simulation; Soil variability; Environmental Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/15139

Revisiting N fertilisation rates in low-rainfall grain cropping regions of Australia: A risk analysis
Provedor de dados: 31
Autores: Monjardino,   Marta; McBeath,   T.; Brennan,   Lisa E.; Llewellyn,   Rick S.
Mallee farmers minimize downside risk in dry seasons by applying low rates of nitrogen (N) fertiliser to their cereal crops. The opportunity to respond to and capitalize on the better years is further limited as most inputs are applied upfront at sowing. We used an economic-risk decision model to identify a range of tactical N fertilisation options that increase net returns, while minimising risk for farmers with different risk attitudes. Importantly, we concluded that when accounting for long-term risks affecting farmers, the use of higher N rates can play a risk-reducing role in a highly variable environment like the Mallee.
Tipo: Presentation
Palavras-chave: Nitrogen; Risk; Variance; Crop simulation; Economic net returns; Decision analysis; Zone management; Monte Carlo; Mallee; Crop Production/Industries; Risk and Uncertainty.
Ano: 2012
URL: http://purl.umn.edu/124339

Potential Environmental Contamination From Conventional and Alternative Cropping Systems in Northeast Kansas
Provedor de dados: 31
Autores: Koo,   Seungmo; Diebel,   Penelope L.
Surface-water contamination from agricultural chemicals is a problem in northeast Kansas. The objective of this study is to compare potential atrazine, nitrogen, and sediment loadings from regional conventional and alternative cropping systems. Results indicate that several alternative systems have lower loading levels for atrazine and sediment than the conventional system, but higher loading levels for nitrogen
Tipo: Working or Discussion Paper
Palavras-chave: Alternative agriculture; Nitrogen; Atrazine; Crop Production/Industries; Environmental Economics and Policy.
Ano: 1994
URL: http://purl.umn.edu/118148

Determining Optimal Levels of Nitrogen Fertilizer Using Random Parameter Models
Provedor de dados: 31
Autores: Tumusiime,   Emmanuel; Brorsen,   B. Wade; Biermacher,   Jon T.; Mosali,   Jagadeesh; Johnson,   Jim; Locke,   James.
The parameters of yield response functions can vary by year. Past studies usually assume yield functions are nonstochastic or ‘limited’ stochastic. In this study, we estimate rye-ryegrass yield functions where all parameters are random. Optimal nitrogen rates are calculated for two yield response functions: linear response plateau and quadratic. Nonstochastic models are rejected in favor of stochastic parameter models. However, the economic benefits of using fully stochastic models are small since optimal nitrogen rates do not differ greatly between stochastic and nonstochastic models.
Tipo: Conference Paper or Presentation
Palavras-chave: Linear response plateau; Monte Carlo; Nitrogen; Random parameters; Agricultural and Food Policy; Crop Production/Industries; Farm Management; Production Economics.
Ano: 2010
URL: http://purl.umn.edu/56514

Factors Affecting Direct and Indirect Energy Use in U.S. Corn Production
Provedor de dados: 31
Autores: Musser,   Wesley N.; Lambert,   Dayton M.; Daberkow,   Stan G.
The recent volatility of energy prices has numerous policy implications for agriculture. A better understanding of the factors associated with energy consumption as related to crop production management decisions and technology use may provide insight about how producers might respond to program or market incentives targeting energy use in particular, and soil and water conservation in general. Adoption of minimum tillage could reduce erosion and improved fertilizer management practices could reduce nitrogen runoff. Energy costs may be reduced with adoption of reduced tillage technology, improved drying and irrigation systems, or more careful attention to the application and timing of fertilizers.
Tipo: Conference Paper or Presentation
Palavras-chave: Energy; Fuel; Nitrogen; Farm management; Technology; Crop Production/Industries; Q12; Q40.
Ano: 2006
URL: http://purl.umn.edu/21063

Effect of Nitrogen Fertilization and Liming on Rye-Ryegrass Yield and Soil pH Dynamics
Provedor de dados: 31
Autores: Tumusiime,   Emmanuel; Brorsen,   B. Wade; Biermacher,   Jon T.; Mosali,   Jagadeesh.
Using ammonium based nitrogen fertilizers in crop production has been shown to acidify soils. Lime used to correct soil pH is an important cost to producers. Recommendations of the optimal level of nitrogen to apply typically ignore the cost of lime created by nitrogen fertilization. This study was aimed to estimate soil pH change in response to nitrogen and lime application, and determine the effect of considering the cost of lime on recommendations about the optimal level of nitrogen. Yield response and pH functions were estimated and used to determine optimal levels of inputs. The effect of the cost of lime on recommendations about the optimal level of nitrogen was found to be marginal. Nitrogen acidification was found to be more severe with nitrogen...
Tipo: Conference Paper or Presentation
Palavras-chave: Lime; Nitrogen; Soil pH; Rye-ryegrass; Crop Production/Industries; Production Economics.
Ano: 2010
URL: http://purl.umn.edu/61295

Whole Farm Modeling of the Effect of Risk on Optimal Tillage and Nitrogen Fertilizer Intensity
Provedor de dados: 31
Autores: Gandorfer,   Markus; Pannell,   David J.; Meyer-Aurich,   Andreas.
Tipo: Conference Paper or Presentation
Palavras-chave: Nitrogen; Tillage; Risk; Risk aversion; Crop Production/Industries; Farm Management; Production Economics; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/61185

An Analysis of the Role of Tile-Drained Farmland Under Alternative Nitrogen Abatement Policies
Provedor de dados: 31
Autores: Petrolia,   Daniel R.; Gowda,   Prasanna H.
Agricultural nitrogen is a major contributor to Gulf of Mexico hypoxia, and research has shown that agricultural subsurface tile drainage is a major carrier of nitrogen from croplands to streams and rivers. This study compares the results of abating nitrogen under a retired-land minimization policy with those of a new revenue-maximizing policy, paying particular attention to the role of tile-drained land. Findings reveal the retirement-minimizing policy resulted in more tile-drained land being retired and less being fertilizer-managed than was optimal under the net-return maximizing policy. Also, it led to a greater economic burden being shouldered by tile-drained land. Under both cases, tile drainage dominated the abatement process.
Tipo: Journal Article
Palavras-chave: Abatement; ADAPT; Drainage; Hypoxia; Nitrogen; Crop Production/Industries; Land Economics/Use.
Ano: 2006
URL: http://purl.umn.edu/8621

SPATIAL BREAK-EVEN VARIABILITY FOR CUSTOM HIRE VARIABLE RATE TECHNOLOGY ADOPTION
Provedor de dados: 31
Autores: Mahajanashetti,   S.B.; English,   Burton C.; Roberts,   Roland K.
A theoretical model identified ranges of spatial variability required within multiple-land-class fields for economically viable variable rate technology (VRT) and the spatial variability required for maximum return to VRT.  An example illustrated that return to VRT and the viable range of spatial variability increased for higher corn and nitrogen prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Site-specific farming; Nitrogen; Corn; Spatial variability; Yield variability; Profit function; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21676

Environmentally Adjusted Agricultural Productivity in the Great Plains
Provedor de dados: 31
Autores: Rezek,   Jon P.; Perrin,   Richard K.
This study adjusts 1960-1996 agricultural productivity gains in a panel of Great Plains states to account for the discharge of pesticide and nitrogen effluents into the environment. The agricultural-environmental technology is approximated with translog distance functions that allow us to contrast traditional versus environmentally adjusted productivity gains. Findings indicate technical change has been increasingly biased toward environmentally friendly production. While the environmental adjustment reduced overall productivity gains during the sample period, in recent years adjusted productivity outpaced the traditional measure, reflecting the pro-environment bias in technical change.
Tipo: Journal Article
Palavras-chave: Agricultural productivity; Distance function; Environmental externalities; Nitrogen; Pesticides; Technical change bias; Environmental Economics and Policy; Productivity Analysis.
Ano: 2004
URL: http://purl.umn.edu/31112

ASSESSING SPATIAL BREAK-EVEN VARIABILITY IN FIELDS WITH TWO OR MORE MANAGEMENT ZONES
Provedor de dados: 31
Autores: English,   Burton C.; Mahajanashetti,   S.B.; Roberts,   Roland K.
Farmers are interested in knowing whether applying inputs at variable rates across a field is economically viable.  The answer depends on the crop, the input, their prices, the cost of variable rate technology (VRT) versus uninform rate technology (URT), and the spatial and yield response variability within each field.  Methods were investigated for determining the range of spatial variability over which the return to VRT covers its additional cost compared with URT in fields with multiple management zones.  Models developed in this article, or variants thereof, could be used to help farmers make the VRT adoption decision.
Tipo: Journal Article
Palavras-chave: Management zones; Nitrogen; Precision farming; Site-specific management; Spatial break-even variability proportions; Spatial variability; Variable rate technology; Yield response variability; Farm Management.
Ano: 2001
URL: http://purl.umn.edu/15450

Modelling Waikato Farm Nitrogen Discharges for Policy Analysis
Provedor de dados: 31
Autores: Ramilan,   Thiagarajah; Scrimgeour,   Frank G.
This study describes the development of bio economic models examining the economic and water quality impact of various proposed policy options in the Upper Waikato catchment. In the first phase nitrogen emissions are determined for representative farming systems using the Overseer nutrient budget model. These model components are integrated into an economic model, which predicts producer responses to various policy options. The second phase determines catchment wide costs and water quality impacts of riparian buffers by combining geographic information system, bio economic modelling and experimental data. The results of the study signals directions for policy initiatives and further analysis exploring policy design and all costs associated with production...
Tipo: Conference Paper or Presentation
Palavras-chave: Riparian margins; Non point pollution; Nitrogen; Linear programming; And Environmental policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Health Economics and Policy; Industrial Organization; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98509

Sustainability of Corn Stover Harvest for Biomass
Provedor de dados: 31
Autores: Sesmero,   Juan P.
Off-farm demand for crop residues is expected to grow as bioenergy policies become effective. Demand for residues will provide farmers with an additional source of revenue but it may also trigger losses in soil organic carbon and increases in fertilizer application. This study develops a dynamic economic model of stover harvest that permits conceptualization and quantification of these potential tradeoffs. We parameterize our model based on publicly available studies of soil biophysical relationships in the Corn Belt. Under these parameter values and 2010 corn and fertilizer prices harvesting stover is not economically convenient at prices below $53 per dry ton of stover. Results suggest that the rate of stover harvest may be quite sensitive and negatively...
Tipo: Conference Paper or Presentation
Palavras-chave: Stover supply; Biomass; Soil productivity; Soil organic carbon; Nitrogen; Environmental Economics and Policy; Farm Management; Land Economics/Use; Resource /Energy Economics and Policy; C61; Q12; Q24; Q42; Q53.
Ano: 2011
URL: http://purl.umn.edu/103765

Site-Specific Simulation of Nutrient Control Policies: Integrating Economic and Water Quality Effects
Provedor de dados: 31
Autores: Burkhart,   Christopher S.; Jha,   Manoj K.
A watershed-based modeling system is developed to assess alternative nutrient abatement policies, including fertilizer taxes, application caps, and uniform reductions. A microeconometric model of nutrient use is estimated using farm-level data, prices, and spatially detailed soil and land characteristics. Results are interfaced with a physical watershed model to predict water quality changes. Simulations demonstrate differences in water quality effects across policies. For nitrate loads at the watershed outlet, an application cap provides slightly superior performance for small reductions, but a tax is more efficient under larger reductions. Phosphorus reductions at the subwatershed level vary but provide information about policy tradeoffs.
Tipo: Article
Palavras-chave: Nitrogen; Nutrient policy; Phosphorus; Water quality; Environmental Economics and Policy; Farm Management; Resource /Energy Economics and Policy.
Ano: 2012
URL: http://purl.umn.edu/122307

A Comparison of Grassland Management Systems for Beef Cattle Using Self-Contained Farmlets: Effects of Contrasting Nitrogen Inputs and Management Strategies on the Farm Economy
Provedor de dados: 31
Autores: Laws,   J.A.; Williams,   Robert J.; Pain,   B.F.
The financial implications of manipulating nitrogen (N) inputs and management strategies for beef production systems were assessed. One-hectare grassland farmlets were grazed to a target sward height by beef steers; herbage surplus to grazing requirements was cut for silage. Three systems were compared: ‘CN’, conventional mineral N application to a grass monoculture and broadcast slurry; ‘TN’, tactical mineral N application at fortnightly intervals to a grass monoculture with slurry injection and the early housing of cattle; ‘GC’, a mixed grass/white clover sward with no mineral N addition and slurry injection. Comparisons were made on two contrasting soil types: a freely-draining sandy loam (site 1) and a poorly drained clay (site 2). Financial budgets...
Tipo: Conference Paper or Presentation
Palavras-chave: Farmlets; Systems; Beef cattle; Nitrogen; Slurry; Animal production; Economics; UK; Farm Management.
Ano: 2002
URL: http://purl.umn.edu/6962

Partial Factor Productivity, Agronomic Efficiency, and Economic Analyses of Maize in Wheat-Maize Cropping System in Pakistan
Provedor de dados: 31
Autores: Amanullah; Almas,   Lal K.
Getting maximum benefits from cereals do not lie in reducing N-rate and its number of splits but lowering cost per unit cereal production through higher yields. Field experiments were conducted on maize (Zea mays L.) at the New Developmental research Farm of NWFP (Northwest Frontier Province) Agricultural University Peshawar-Pakistan during 2002-03 and 2003-04 in order to investigate effects of variable rates of N and its time of application on the partial factor productivity (PFPN), agronomic efficiency (AEN), net returns (NR), value-cost ratio (VCR) and marginal returns (MR). The 2 x 3 x 6 factorial experiment was designed having two plant densities (D1 = 60,000 and D2 = 100,000 plants ha-1) and three N levels (N1 = 60, N2 = 120 and N3 = 180 kg N ha-1)...
Tipo: Conference Paper or Presentation
Palavras-chave: Maize; Zea mays L.; Planting density; Nitrogen; Agronomic efficiency; Economics; Crop Production/Industries; Farm Management; International Development; Production Economics; Productivity Analysis.
Ano: 2009
URL: http://purl.umn.edu/46747

Tradable Substitution Rights: Simulation of the Cost-Efficiency of a Nitrogen Reduction in the Pig Finishing Sector
Provedor de dados: 31
Autores: Carlier,   Peter Jan; Lauwers,   Ludwig H.; Mathijs,   Erik.
To comply with the European Nitrate Directive, the Flemish manure policy has been elaborated mainly on the base of command and control measures (maximum fertilisation limits etc.). In literature, however, tradable permits are described as a cost efficient and effective instrument. Applied to nutrient emission they might offer an alternative for the current, expensive manure policy. In this publication both policy instruments are compared by means of simulation models. Based on accountacy data from 190 pig finishing farms, it is shown that tradable rights may result in cost savings of over 88%, compared to the most cost efficient command and control model. This result indicates that tradable permits at least need to be considered as a plausible policy...
Tipo: Conference Paper or Presentation
Palavras-chave: Tradable permits; Agriculture; Command and control; Nitrogen; Linear programming; Livestock Production/Industries; C61; D23; H23; Q58; Q52.
Ano: 2005
URL: http://purl.umn.edu/24746

NITROGEN-FIXING WINTER COVER CROPS AND PRODUCTION RISK: A CASE STUDY FOR NO-TILLAGE CORN
Provedor de dados: 31
Autores: Larson,   James A.; Roberts,   Roland K.; Tyler,   Donald D.; Duck,   Bob N.; Slinsky,   Stephen P.
Winter legumes can substitute for applied nitrogen fertilization of corn.  Stochastic dominance was used to order net revenues from legume and applied nitrogen alternatives.  Stochastic dominance orderings indicate that systems combining vetch with low applied nitrogen fertilization (50 and 100 pounds/acre, respectively) were risk inefficient. By contrast, vetch and 150 pounds/acre applied nitrogen maximized expected net revenue and was risk efficient for a wide range of risk-averse and risk-seeking behavior.  Farmers with these risk attitudes may not reduce applied nitrogen if they switch to a vetch cover.  Extremely risk-averse or risk-seeking farmers would not prefer winter legumes.
Tipo: Journal Article
Palavras-chave: Legume winter crops; Nitrogen; Risk premiums; Stochastic dominance; Crop Production/Industries.
Ano: 1998
URL: http://purl.umn.edu/15098

MANAGING MANURE TO IMPROVE AIR AND WATER QUALITY
Provedor de dados: 31
Autores: Aillery,   Marcel P.; Gollehon,   Noel R.; Johansson,   Robert C.; Kaplan,   Jonathan D.; Key,   Nigel D.; Ribaudo,   Marc.
Animal waste from confined animal feeding operations is a potential source of air and water quality degradation from evaporation of gases, runoff to surface water, and leaching to ground water. This report assesses the potential economic and environmental tradeoffs between water quality policies and air quality policies that require the animal agriculture sector to take potentially costly measures to abate pollution. A farm-level analysis of hog farms estimates the economic and environmental tradeoffs that occur when policies are designed to address pollutant flows to one environmental medium without considering flows to another medium. A national analysis addresses the broader impacts of coordinated (water and air) policies, including long-term structural...
Tipo: Report
Palavras-chave: Animal waste; Nitrogen; Ammonia; Water quality; Nutrient management plan; Manure management costs; Price and quantity adjustments; CAFO; Environmental Economics and Policy; Livestock Production/Industries.
Ano: 2005
URL: http://purl.umn.edu/33593

Tradeoffs Between Water Quality and the Economic Impacts of Low-Input Agriculture in the Coastal Plain of Virginia
Provedor de dados: 31
Autores: Diebel,   Penelope L.; Taylor,   Daniel B.; Batie,   Sandra S.; Heatwole,   Conrad D.
Agricultural activities have been identified as major contributors to the non-point pollution of the Chesapeake Bay. Low-input agricultural practices are being considered to reduce pollution in areas adjoining the Chesapeake Bay. A multiperiod mathematical programming model was used to examine the potential adoption of low-input practices and to assess the environmental consequences of these activities under different policies. The results of these analyses indicate that tradeoffs exist among the types of non-point pollution produced under each policy. Only policies that retired productive agricultural land reduced all pollutant types.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental tradeoffs; Low-input agriculture; Nitrogen; Pesticides; Farm Management; Resource /Energy Economics and Policy.
Ano: 1992
URL: http://purl.umn.edu/118176

World Fertilizer Model—The WorldNPK Model
Provedor de dados: 31
Autores: Rosas,   Francisco.
We introduce a world fertilizers model that is capable of producing fertilizer demand projections by crop, by country, by macronutrients, and by year. For each crop, the most relevant countries in terms of production, consumption, or trade are explicitly modeled. The remaining countries are modeled, for each crop, within a regional aggregate. The nutrient coverage includes nitrogen (N), phosphorous (P), and potassium (K). In this report we present the data and procedures used to set up the model as well as the assumptions made. The fertilizer model interacts with the yield equations of the FAPRI-ISU model (Food and Agricultural Policy Research Institute at Iowa State University), and by means of a set of production elasticities, projects each nutrient’s...
Tipo: Working or Discussion Paper
Palavras-chave: Agriculture; Fertilizer; Nitrogen; Phosphorous; Policy analysis; Potassium; Projections; Crop Production/Industries; Demand and Price Analysis; Production Economics.
Ano: 2011
URL: http://purl.umn.edu/103223

Effects of Nutrient Restrictions on Confined Animal Facilities: Insights from a Structural Model
Provedor de dados: 31
Autores: Baerenklau,   Kenneth A.; Nergis,   Nermin; Schwabe,   Kurt A.
Nutrient emissions from animal feeding operations continue to degrade water and air quality.  New regulations will limit the amounts of nutrients that can be locally applied to land.  In this article, a structural-dynamic model of a livestock-crop operation is calibrated with data from a representative farm and is used to predict the effects of nitrogen regulations.  Policy simulations clarify the importance of dynamic elements and demonstrate three main results: (1) cost estimates are relatively high; (2) cross-media pollution effects are potentially large; and (3) improved input management appears most promising for reducing both emissions and waste management costs.  Implications for policy and future research are discussed.
Tipo: Conference Paper or Presentation
Palavras-chave: Ammonia; Animal feeding operation; Cross-media pollution; Dairy; Dynamic optimization; Groundwater; Nitrate; Nitrogen; Nutrient management plan; Livestock Production/Industries.
Ano: 2007
URL: http://purl.umn.edu/10253

Managing Nitrogen and Phosphorus Nutrients for Switchgrass Produced for Bioenergy Feedstock in Phosphorus-Deficient Soil
Provedor de dados: 31
Autores: Haque,   Mohua; Biermacher,   Jon T.; Kering,   Maru K.; Guretzky,   John A.
There is limited information available explaining the agronomic and economic relationships between yield and nitrogen and phosphorus applications to growing switchgrass produced in phosphorus-deficient soils.  The objective of this study was to determine the effects of nitrogen and phosphorus fertilizers on feedstock yield and measures of expected total cost, gross revenue, net return, and breakeven price of feedstock  produced in phosphorus-deficient soils in the southern Great Plains. Data were collected from a three-year, two-location agronomic field study conducted in south-central Oklahoma. Two discrete nitrogen treatments (0 and 134 kg ha-1) and four discrete phosphorus treatments (0, 30, 60 and 90 kg ha-1) were randomly assigned to small plots...
Tipo: Presentation
Palavras-chave: Bioenergy feedstock; Economics; Phosphorus-deficient soils; Nitrogen; Switchgrass; Crop Production/Industries; Environmental Economics and Policy; Production Economics.
Ano: 2012
URL: http://purl.umn.edu/119765

Agricultural Drainage and Gulf Hypoxia: Economic Targeting of Farmland to Reduce Nitrogen Loads in a Minnesota Watershed
Provedor de dados: 31
Autores: Petrolia,   Daniel R.; Gowda,   Prasanna H.; Mulla,   David J.
Agricultural nitrogen losses are the major contributor to nitrogen loads in the Mississippi River, and consequently, to the existence of a hypoxic, or "dead", zone in the Gulf of Mexico.  Focusing on two small agricultural watersheds in southwestern Minnesota, simulation results from the Agricultural Drainage And Pesticide Management (ADAPT) model were combined with a linear-optimization model to evaluate the environmental and economic impact of alternative land-use policies for reducing nitrogen losses.  Of particular importance was the study's explicit focus on agricultural subsurface (tile) drainage, which has been identified as the major pathway for agricultural nitrogen losses in the upper Midwest, and the use of drainage-focused abatement policies....
Tipo: Conference Paper or Presentation
Palavras-chave: Drainage; Hypoxia; ADAPT; Nitrogen; Watershed; Environmental Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/19416

The Cost of Increasing Adoption of Beneficial Nutrient-Management Practices
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Livingston,   Michael J.; Nehring,   Richard F.; Sands,   Ronald D.; Wechsler,   Seth James.
We estimate the cost of offsets tied to reductions in the use of nitrogen on U.S. cornfields under the proposed American Clean Energy and Security Act.
Tipo: Conference Paper or Presentation
Palavras-chave: Offsets; Nitrogen; Corn; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/60946

Leaf contents of nitrogen and phenolic compounds and their bearing with the herbivore damage to Tibouchina pulchra Cogn. (Melastomataceae), under the influence of air pollutants from industries of Cubatão, São Paulo
Provedor de dados: 88
Autores: FURLAN,CLÁUDIA MARIA; SALATINO,ANTONIO; DOMINGOS,MARISA.
The Atlantic Forest on the slopes of Serra do Mar around Cubatão (São Paulo, Brazil) has been affected by massive emissions of pollutants from the local growing industrial complex. The effects of air pollution on the amounts of leaf nitrogen, total soluble phenols and total tannins of Tibouchina pulchra Cogn., a common species in the area of Cubatão, were investigated, as well as the possible influence of the altered parameters on the leaf area damaged by herbivores. Fully expanded leaves were collected at two sites: the valley of Pilões river (VP), characterized by a vegetation virtually not affected by air pollution and taken as a reference; and valley of Mogi river (VM), close to the core region of the industrial complex, and severely affected by air...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution; Herbivory; Tibouchina pulchra Cogn.; Cubatão; Nitrogen; Phenolics.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500014

Broiler litter reutilization applying different composting concepts
Provedor de dados: 89
Autores: Sonoda,LT; Moura,DJ; Bueno,LGF; Cordeiro,DC; Mendes,AS.
Broiler litter reutilization consists in using the same bedding material to cover the house floor for several broiler flocks. This requires the litter to be treated in order to reduce the amount of microorganisms, according to international recommendations. The aim of this study was to evaluate two methods of broiler litter fermentation based on composting concepts and their effect on litter and the air quality during fermentation in small-scale broiler houses. The experiment was carried out in the Environmental Laboratory I of the School of Agricultural Engineering of the State University of Campinas, utilizing six small-scale houses. Litter from the same grow-out (one, two or three) was distributed in two experimental houses, where it was either piled or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fermentation; Nitrogen; Waste treatment; Broiler.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300011

Reduced Nutrient Excretion and Environmental Microbial Load with the Addition of a Combination of Enzymes and Direct-Fed Microbials to the Diet of Broiler Chickens
Provedor de dados: 89
Autores: Praes,MFFM; Lucas Junior,J; Duarte,KF; Sorbara,JOB; Matos Junior,JB; Sgavioli,S; Domingues,CHF; Garcia,RG; Hermes,RG.
Abstract This study evaluated the effects of the dietary inclusion of an enzyme blend and a direct-fed microbials in broiler diets on litter production and quality. In total, 900 Cobb 500(r) broiler chicks were distributed according to a completely randomized design into 4 treatments and 9 replicates of 25 birds each. Broilers were reared from 1 to 42 days of age. The treatments consisted of the following diets: NC: negative control; DFM: NC + 500 ppm of direct-fed microbials product (DFM), containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm of xylanase); DFM+E: ENZ + DFM. Birds and litter were weighed at the start and end of the rearing period, for litter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste ratio; Total and thermotolerant coliforms; Phosphorus; Nitrogen; Potassium.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100125

Nitrous Oxide Emissions in No-Tillage Onion ( Allium cepa L.) Crops Are Increased by Oilseed Radish Cover Crop and Poultry Manure Application
Provedor de dados: 90
Autores: Müller Júnior,Vilmar; Koucher,Leoncio de Paula; Souza,Monique; Lima,Andria Paula; Kurtz,Claudinei; Couto,Rafael da Rosa; Lovato,Paulo Emílio; Giacomini,Sandro José; Brunetto,Gustavo; Comin,Jucinei José.
ABSTRACT The use of cover crops and poultry manure (PM) is an alternative to reduce the use of synthetic inputs and can contribute to the nutrient cycling in onions ( Allium cepa L.) grown under a no-tillage system. However, this management practice may contribute to an increase in N2O emissions to the atmosphere. The aims of this study were to evaluate the immediate effect on N2O emissions of adding PM onto cover crop residues and to verify the effect of different no-tillage systems on N2O emissions. Two studies (laboratory and field) were conducted with the addition of oilseed radish (OR), black oat (BO), and weed (WD) residues with and without PM under a no-tillage (NT) system. Emission of N2O (kg ha-1) was influenced by the different residue-management...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N2O; Nitrogen; Cover crop residue; Organic fertilizer; Greenhouse gases.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100511

Maize response to nitrogen fertilization timing in two tillage systems in a soil with high organic matter content
Provedor de dados: 90
Autores: Sangoi,Luis; Ernani,Paulo Roberto; Silva,Paulo Regis Ferreira da.
No-tillage systems, associated to black oat as preceding cover crop, have been increasingly adopted. This has motivated anticipated maize nitrogen fertilization, transferring it from the side-dress system at the stage when plants have five to six expanded leaves to when the preceding cover crop is eliminated or to maize sowing. This study was conducted to evaluate the effects of soil tillage system and timing of N fertilization on maize grain yield and agronomic efficiency of N applied to a soil with high organic matter content. A three-year field experiment was conducted in Lages, state of Santa Catarina, from 1999 onwards. Treatments were set up in a split plot arrangement. Two soil tillage systems were tested in the main plots: conventional tillage (CT)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Nitrogen; Immobilization; Leaching; Grain yield.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000300011

Urea coated with oxidized charcoal reduces ammonia volatilization
Provedor de dados: 90
Autores: Paiva,Diogo Mendes de; Cantarutti,Reinaldo Bertola; Guimarães,Gelton Geraldo Fernandes; Silva,Ivo Ribeiro da.
Urea is the most consumed nitrogen fertilizer in the world. However, its agronomic and economic efficiency is reduced by the volatilization of NH3, which can reach 78 % of the applied nitrogen. The coating of urea granules with acidic compounds obtained by charcoal oxidation has the potential to reduce the volatilization, due to the acidic character, the high buffering capacity and CEC. This work aimed to evaluate the effect of HNO3-oxidized carbon on the control of NH3 volatilization. These compounds were obtained by oxidation of Eucalyptus grandis charcoal, produced at charring temperatures of 350 and 450 ºC, with 4.5 mol L-1 HNO3. The charcoal was oxidized by solubilization in acidic or alkaline medium, similar to the procedure of soil organic matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizer; Nitrogen; Urease.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400016

Nitrogen and Potassium in Narrow-Row Cotton
Provedor de dados: 90
Autores: Kappes,Claudinei; Zancanaro,Leandro; Francisco,Eros Artur Bohac.
ABSTRACT Information on fertilizer management for cotton in narrow-row cropping system is scarce; therefore, studies are needed to improve nutrient stewardship for such systems. The aim of this study was to evaluate the effects of nitrogen and potassium application on yield and fiber quality of cotton under a narrow-row system. A field trial was carried out for three years, where the treatments were set up in an incomplete factorial arrangement [(4 × 4) + 1] under a randomized block design, with four N rates (20, 40, 60, and 80 kg ha-1), four K2O rates (0, 40, 80, and 120 kg ha-1), and one control (no N or K2O), for a total of 17 treatments, with four replicates. Urea and potassium chloride were applied on the soil surface 20 days after crop emergence....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Nitrogen; Potassium; Narrow-row cotton.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100512

Ammonia volatilization and yield components after application of polymer-coated urea to maize
Provedor de dados: 90
Autores: Zavaschi,Eduardo; Faria,Letícia de Abreu; Vitti,Godofredo Cesar; Nascimento,Carlos Antonio da Costa; Moura,Thiago Augusto de; Vale,Diego Wyllyam do; Mendes,Fernanda Latanze; Kamogawa,Marcos Yassuo.
A form of increasing the efficiency of N fertilizer is by coating urea with polymers to reduce ammonia volatilization. The aim of this study was to evaluate the effect of polymer-coated urea on the control of ammonia volatilization, yield and nutritional characteristics of maize. The experiment was carried out during one maize growing cycle in 2009/10 on a Geric Ferralsol, inUberlândia, MG, Brazil. Nitrogen fertilizers were applied as topdressing on the soil surface in the following urea treatments: polymer-coated urea at rates of 45, 67.5 and 90 kg ha-1 N and one control treatment (no N), in randomized blocks with four replications. Nitrogen application had a favorable effect on N concentrations in leaves and grains, Soil Plant Analysis Development (SPAD)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Polymer-coated urea; N fertilizer; Ammonia volatilization; Zea mays; SPAD reading.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400016

Dynamics of ammonium and pH in the solution of soils with different salinity levels, growing irrigated rice
Provedor de dados: 90
Autores: Carmona,Felipe de Campos; Anghinoni,Ibanor; Cao,Eduardo Giacomelli.
Rice in Rio Grande do Sul State is grown mostly under flooding, which induces a series of chemical, physical and biological changes in the root environment. These changes, combined with the presence of rice plants, affect the availability of exchangeable ammonium (NH4+) and pH of soil solution, whereas the dynamics of both variables can be influenced by soil salinity, a common problem in the coastal region. This study was conducted to evaluate the dynamics of exchangeable NH4+ and pH in the soil solution, and their relation in the solution of Albaqualf soils with different salinity levels, under rice. Four field experiments were conducted with soils with exchangeable Na percentage (ESP) of 5.6, 9.0, 21.2, and 32.7 %. Prior to flooding, soil solution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Acidity; Exchangeable sodium percentage.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200009

Urease Inhibitor and Irrigation Management to Mitigate Ammonia Volatilization from Urea in No-Till Corn
Provedor de dados: 90
Autores: Viero,Fernando; Menegati,Guilherme Batista; Carniel,Eduardo; Silva,Paulo Regis Ferreira da; Bayer,Cimélio.
ABSTRACT High nitrogen (N) losses by ammonia (NH3) volatilization from urea can compromise nitrogen fertilization efficiency and corn yield. The purpose of this study was to assess the effects of irrigation management and the addition of the urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) on NH3-N losses from urea and on corn yield. To this end, two experiments were carried out in the 2011/12 crop season on a sandy clay loam Acrisol in the Central Basin region of Rio Grande do Sul, southern Brazil. Experiment I consisted of two different N sources (urea and urea plus the inhibitor) at a rate of 200 kg ha-1 N and two corn sowing times [viz., an early time (Sept. 3, 2011) and an intermediate time (Oct. 3, 2011)]. Experiment II considered a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Nitrogen; NBPT.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100532

Growth and Nutrition of Eucalypt Rooted Cuttings Promoted by Ectomycorrhizal Fungi in Commercial Nurseries
Provedor de dados: 90
Autores: Gandini,Andrezza Mara Martins; Grazziotti,Paulo Henrique; Rossi,Márcio José; Grazziotti,Danielle Cristina Fonseca Santos; Gandini,Elizzandra Marta Martins; Silva,Enilson de Barros; Ragonezi,Carla.
ABSTRACT Ectomycorrhizal fungi (EMF) may improve the adaptation of eucalypts saplings to field conditions and allow more efficient fertilizer use. The effectiveness of EMF inoculum application in promoting fungal colonization, plant growth, nutrient uptake, and the quality of rooted cuttings was evaluated forEucalyptus urophylla under commercial nursery conditions. For inoculated treatments, fertilization of the sapling substrate was reduced by 50 %. The experiment was carried out in a completely randomized design in a 4 × 4 factorial arrangement, wherein the factors were inoculum application rates of 0 (control), 5, 10, and 15 gel beads of calcium alginate containing the vegetative mycelium of Amanita muscaria, Elaphomyces antracinus, Pisolithus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symbiosis; Plant nutrition; Cuttings production; Phosphorus; Nitrogen; Potassium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601554

Optical crop sensor for variable-rate nitrogen fertilization in corn: II - indices of fertilizer efficiency and corn yield
Provedor de dados: 90
Autores: Bragagnolo,Jardes; Amado,Telmo Jorge Carneiro; Nicoloso,Rodrigo da Silveira; Santi,Antônio Luis; Fiorin,Jackson Ernani; Tabaldi,Fabiano.
Generally, in tropical and subtropical agroecosystems, the efficiency of nitrogen (N) fertilization is low, inducing a temporal variability of crop yield, economic losses, and environmental impacts. Variable-rate N fertilization (VRF), based on optical spectrometry crop sensors, could increase the N use efficiency (NUE). The objective of this study was to evaluate the corn grain yield and N fertilization efficiency under VRF determined by an optical sensor in comparison to the traditional single-application N fertilization (TSF). With this purpose, three experiments with no-tillage corn were carried out in the 2008/09 and 2010/11 growing seasons on a Hapludox in South Brazil, in a completely randomized design, at three different sites that were analyzed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; N-Sensor; Optical spectrometry; Precision farming.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500019

Effect of fertilizer-N application and seed coating with rhizobial inoculants on soybean yield in eastern Paraguay
Provedor de dados: 90
Autores: Kubota,Aki; Hoshiba,Kent; Bordon,Jorge.
Nitrogen removal in soybean grains at harvest may exceed biological N2 fixation, particularly if grain yields are as high as typically achieved on "Terra Rossa" soils of Eastern Paraguay. Applying N fertilizer or coating seeds with rhizobial inoculants that enhance nodulation may represent a way of balancing the N budget. However, the effects of such treatments appear to be highly site-specific. The objective of this study was to examine the effects of N application (N) and rhizobial inoculation (I) on nodulation, N accumulation and soybean yields in Eastern Paraguay. Field experiments were conducted in two consecutive soybean seasons. Dry conditions in the first year delayed sowing and reduced plant number m-2 and pod number plant-1. Grain yields were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Inoculum; Nitrogen; Nodulation; Rhizobium.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000400027

Upland rice under no-tillage preceded by crops for soil cover and nitrogen fertilization
Provedor de dados: 90
Autores: Moro,Edemar; Crusciol,Carlos Alexandre Costa; Cantarella,Heitor; Nascente,Adriano Stephan.
The grain yield of upland rice under no-tillage has been unsatisfactory and one reason could be the nitrate/ammonium balance in the soil. Cover crops and nitrogen fertilization can be used to change the nitrate/ammonium relation in the soil and improve conditions for the development of upland rice in the no-tillage (NT) system. The aim was to study the effect of cover crops and nitrogen sources on grain yield of upland rice under no tillage. The study was carried out on the Fazenda Experimental Lageado, in Botucatu, State of São Paulo, Brazil, in an Oxisol area under no-tillage for six years. The experiment was arranged in a randomized block split-plot design with four replications. The plots consisted of six cover crop species (Brachiaria brizantha, B....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Ammonium; Nitrate; Millet; Brachiaria; Crotalaria spectabilis; Nitrogen.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600023

Ammonia volatilization of urea in the out-of-season corn
Provedor de dados: 90
Autores: Pereira,Hamilton Seron; Leão,Anabelisa Ferreira; Verginassi,Adriana; Carneiro,Marco Aurélio Carbone.
The aim of this study was to evaluate the N losses due to volatilization at different rates of common urea, polymer coated urea and urease inhibitor-treated urea in the out-of-season corn, using semi-open static collectors. The treatments consisted of N levels on side-dressing fertilization with urea in different treatments: (a) control (without N), (b) urea 40 kg ha-1 N, (c) urea 80 kg ha-1 N, (d) polymer coated urea 40 kg ha-1 N, (e) polymer coated urea 80 kg ha-1 N and (f) urea with the urease inhibitor (UI) N 80 kg ha-1 N. The results showed that the treatments with polymer coated urea and with urease inhibitor-treated urea reduced the volatilization of N around 50 % compared to common urea, either in the first and the second N side-dressing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Nitrogen fertilization; Slow release.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600017

Ammonia losses estimated by an open collector from urea applied to sugarcane straw
Provedor de dados: 90
Autores: Mariano,Eduardo; Trivelin,Paulo Cesar Ocheuze; Vieira,Michele Xavier; Leite,José Marcos; Otto,Rafael; Franco,Henrique Coutinho Junqueira.
The quantification of ammonia (NH3) losses from sugarcane straw fertilized with urea can be performed with collectors that recover the NH3 in acid-treated absorbers. Thus, the use of an open NH3 collector with a polytetrafluoroethylene (PTFE)-wrapped absorber is an interesting option since its cost is low, handling easy and microclimatic conditions irrelevant. The aim of this study was to evaluate the efficiency of an open collector for quantifying NH3-N volatilized from urea applied over the sugarcane straw. The experiment was carried out in a sugarcane field located near Piracicaba, São Paulo, Brazil. The NH3-N losses were estimated using a semi-open static collector calibrated with 15N (reference method) and an open collector with an absorber wrapped in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Nitrogen; N fertilization; Volatilization; Collection system.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200010

Poultry Litter and Pig slurry Applications in an Integrated Crop-Livestock System
Provedor de dados: 90
Autores: Hentz,Paulo; Corrêa,Juliano Corulli; Fontaneli,Renato Serena; Rebelatto,Agostinho; Nicoloso,Rodrigo da Silveira; Semmelmann,Claudio Eduardo Neves.
ABSTRACT Organic fertilizers derived from poultry litter and pig slurry are alternatives to mineral fertilizers in increasing soil nutrient availability. The aim of this study was to evaluate soil response, through characterization of organic C and available N, P, and K contents, and corn yield response to increasing amounts of poultry litter, pig slurry, and mineral fertilizers in an integrated crop-livestock production system (ICL) from 2011 to 2013. The experimental design consisted of randomized blocks in a 4 × 3 + 1 factorial arrangement with four replicates. The treatments consisted of four types of fertilizer, two organic (poultry litter and pig slurry) and two mineral, balanced with the same amounts of N, P and K as the organic fertilizers, one of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral fertilizers; Organic carbon; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100535

CO2, CH4 and N2O fluxes in an Ultisol treated with sewage sludge and cultivated with castor bean
Provedor de dados: 90
Autores: Chiaradia,Jonas Jacob; Chiba,Marcio Koiti; Andrade,Cristiano Alberto de; Carmo,Janaína Braga do; Oliveira,Claudeir de; Lavorenti,Arquimedes.
Organic residue application into soil alter the emission of gases to atmosphere and CO2, CH4, N2O may contribute to increase the greenhouse effect. This experiment was carried out in a restoration area on a dystrophic Ultisol (PVAd) to quantify greenhouse gas (GHG) emissions from soil under castor bean cultivation, treated with sewage sludge (SS) or mineral fertilizer. The following treatments were tested: control without N; FertMin = mineral fertilizer; SS5 = 5 t ha-1 SS (37.5 kg ha-1 N); SS10 = 10 t ha-1 SS (75 kg ha-1 N); and SS20 = 20 t ha-1 SS (150 kg ha-1 N). The amount of sludge was based on the recommended rate of N for castor bean (75 kg ha-1), the N level of SS and the mineralization fraction of N from SS. Soil gas emission was measured for 21...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residue; Nitrogen; Carbon dioxide; Nitrous oxide; Methane.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600035

Brachiaria species affecting soil nitrification
Provedor de dados: 90
Autores: Fernandes,Adalton Mazetti; Andrade,Gabriel José Massoni de; Souza,Emerson de Freitas Cordova de; Rosolem,Ciro Antonio.
Nitrification can lead to substantial losses of the applied N through nitrate leaching and N2O emission. The regulation of nitrification may be a strategy to improve fertilizer N recovery and increase its agronomic efficiency. The objective of this study was to evaluate the inhibiting capacity of nitrification in soil by Brachiaria species. The greenhouse experiment was conducted using pots with 10 dm³ of a Red Latosol sample. The treatments consisted of the cultivation of three forage species (Brachiaria brizantha, B. ruziziensis and B. decumbens) and four n rates (0, 100, 200, and 300 mg/pot), and the control (without plants). In the absence of the forage plants, all N fertilization levels raised the N-NO3- soil levels, as a result of nitrification. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium; Nitrate; Nitrogen.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500024

Use of stabilization pond sludge in cultivation of roses
Provedor de dados: 91
Autores: Paixão Filho,Jorge L. da; Gabrielli,Giuliano; Coraucci Filho,Bruno; Tonetti,Adriano L.
One option for the increasing production of sewage sludge (SS) is its agricultural use in crops with high nutritional demand, such as the rose. Therefore, the aim of this work was to study the application of SS from primary stabilization pond in roses of the variety 'Carola'. For the experiment, the roses were planted in 20 L recipients using increasing doses of sludge (T2 - 12 Mg ha-1, T3 - 24 Mg ha-1 and T4 - 36 Mg ha-1), mineral fertilizer (T5) and control treatment (T1, without N) in a randomized block design. The evaluated parameters were: roots dry mass, aerial dry mass, total biomass, leaflets area and nitrogen concentration in the leaf. The SS application resulted in better development of the rose, increasing the roots and the aerial biomasses, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Roots; Leaf area; Agriculture; Facultative ponds.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000100011

Nitrogen and phosphorus fertilization of sunflower crop in alkaline Cambisol
Provedor de dados: 91
Autores: Braga,Daniely F.; Oliveira,Fabio H. T. de; Santos,Hemmannuella C.; Araújo,Adelson P.; Zonta,Everaldo.
ABSTRACT Sunflower is a crop that has aroused the interest of farmers because of its adaptability to wide climatic conditions and for its use in biodiesel production. However, there are only a few studies on sunflower fertilization in alkaline soils. This study aimed to evaluate nitrogen (N) and phosphorus (P) fertilization in sunflower (Helianthus annuus L.) cultivated in alkaline soil. A field experiment was carried out in Baraúnas-RN, Brazil, in a Haplic Cambisol derived from calcareous rock, where the sunflower H-251 hybrid was cultivated. The treatments were a combination of four doses of N (30, 60, 90 and 120 kg ha-1) and four doses of P2O5 (30, 60, 90 and 120 kg ha-1). Sunflower growth and yield increased with the doses of N and P2O5. Doses of 30 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus; Oilseed crop; Nitrogen; Phosphorus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000200101

Fruit quality of ‘Eva’ e ‘Princesa’ apples grown under nitrogen fertigation in semiarid climate
Provedor de dados: 91
Autores: Miranda,João M. de S.; Cavalcante,Ítalo H. L.; Oliveira,Inez V. de M.; Lopes,Paulo R. C.; Assis,Joston S. de.
ABSTRACTThe production of high quality fruits is a necessary factor for the adaptation and production of plant species with economic viability. Thus, an experiment was conducted from July 2012 to January 2013 to evaluate the fruit quality of the ‘Eva’ and ‘Princesa’ apple cultivars as a function of nitrogen fertilization in Petrolina, PE, Brazil. The experimental design consisted of randomized blocks, with treatments distributed in a factorial arrangement 2 x 4, corresponding to apple cultivars (Eva and Princesa) and nitrogen doses (40; 80; 120 and 160 kg of N ha-1), with four replications and three plants in each plot. The fruit characteristics, such as fruit mass, skin color (luminosity, chromaticity, and colour angle), size (width and length), pulp...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Nitrogen; Post-harvest.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001000967

Formation of ‘Crioula’ guava rootstock under saline water irrigation and nitrogen doses
Provedor de dados: 91
Autores: Souza,Leandro de P.; Nobre,Reginaldo G.; Silva,Evandro M. da; Lima,Geovani S. de; Pinheiro,Francisco W. A.; Almeida,Luana L. de S.
ABSTRACT The objective of this research was to evaluate the growth and formation of fresh and dry weight of ‘Crioula’ guava rootstock irrigated with waters of different saline levels and nitrogen (N) doses, in an experiment conducted in plastic tubes under greenhouse conditions. The experimental design was randomized blocks, in a 5 x 4 factorial scheme with four replicates, and the treatments consisted of five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the cultivation of guava seedlings, cv. ‘Paluma’). The dose referring to 100% corresponds to 773 mg of N dm-3. The highest growth of ‘Crioula’ guava rootstock was obtained with ECw of 0.3 dS m-1 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava L.; Water electrical conductivity; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800739

Morphophysiology of guava under saline water irrigation and nitrogen fertilization
Provedor de dados: 91
Autores: Bezerra,Idelfonso L.; Nobre,Reginaldo G.; Gheyi,Hans R.; Souza,Leandro de P.; Pinheiro,Francisco W. A.; Lima,Geovani S. de.
ABSTRACT The aim of this study was to evaluate the growth of grafted guava cv. ‘Paluma’ subjected to different concentrations of salts in irrigation water and nitrogen (N) fertilization. The plants were transplanted to 150 L lysimeters and under field conditions at the Science and Agri-food Technology Center of the Federal University of Campina Grande, in the municipality of Pombal - PB. The experiment was conducted in randomized block design in a 5 x 4 factorial scheme, with three replicates, and the treatments corresponded to five levels of electrical conductivity of irrigation water - ECw (0.3; 1.1; 1.9; 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the crop). The doses equivalent to 100% corresponded to 541.1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava L.; Electrical conductivity; Nitrogen.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100032

Nitrous oxide emission in response to N application in irrigated sugarcane
Provedor de dados: 91
Autores: Lopes,Alzeneide da S.; Andrade Júnior,Aderson S. de; Bassoi,Luís H.; Silva,Josiane F.; Bastos,Edson A.; Paulo,Vitória de F.
ABSTRACT The objective of this study was to compare the emissions of nitrous oxide (N2O) resulting from the application of nitrogen (N) and potassium (K) doses in fertigated sugarcane, in comparison to emissions from conventional fertilizer application. The study was conducted in the experimental area of Embrapa Mid-North, Teresina, Piauí state, Brazil, from August 2014 to January 2015. The experimental design was in randomized blocks, analyzed in a (2 x 2) +1 factorial scheme, with four replicates. The treatments consisted of the combination of two doses of N and K2O (60-120 and 120-180 kg ha-1, respectively) and two methods of application (in soil and fertigation), and a control. The use of fertigation reduced the emissions of N2O in sugarcane compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum officinarum; Nitrogen; GHG.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100758

Growth regulator on oat yield indicators
Provedor de dados: 91
Autores: Krysczun,Dionatan K.; Silva,José A. G. da; Marolli,Anderson; Trautmann,Ana P. B.; Lucio,Alessandro D.; Carbonera,Roberto.
ABSTRACT Growth regulator in oat can reduce lodging with effects on yield indicators. The objective of the study is to define the optimum dose of growth regulator to reduce lodging in oats under different conditions of nitrogen (N) fertilization (reduced, high and very high) and the effects on yield indicators in the succession systems. In each succession system (soybean/oats and corn/oats), two experiments were conducted, one to quantify biomass yield and the other to estimate grain yield and lodging. In the four experiments, the design was randomized blocks with four replicates in 3 x 4 factorial scheme, for N-fertilizer doses (30, 90 and 150 kg ha-1) and growth regulator doses (0, 200, 400 and 600 mL ha-1), respectively. Growth regulator reduces lodging...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Trinexapac-ethyl; Lodging; Nitrogen.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200828

Urochloa ruziziensis responses to sources and doses of urea
Provedor de dados: 91
Autores: Lima,João E. S.; Nascente,Adriano S.; Leandro,Wilson M.; Silveira,Pedro M. da.
ABSTRACT The use of products that promote reduction of nitrogen (N) losses from the urea fertilizer can contribute to increasing its use efficiency in forage grasses. This study aimed to evaluate the effects of N sources and doses on the growth of Urochloa ruziziensis. The experiment was carried out in the growing season of 2007/2008 in Santo Antônio de Goiás-GO, in a Brazilian Oxisol. A completely randomized block was used, with four replicates in a factorial scheme, corresponding to two N sources (conventional urea and urea with urease inhibitor) and five N doses (0, 50, 100, 200 and 300 kg ha-1), divided into equal applications in five periods (Nov 14 to Dec 13, Dec 14 to Jan 12, Jan 13 to Feb 11 - rainy season, Mar 24 to Apr 22 and Jul 10 to Aug 08 -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll contente; Forage; Nitrogen; Stabilized urea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500401

Biomass and grain yield of oats by growth regulator
Provedor de dados: 91
Autores: Marolli,Anderson; Silva,José A. G. da; Romitti,Marcos V.; Mantai,Rubia D.; Hawerroth,Maraisa C.; Scremin,Osmar B.
ABSTRACT The use of growth regulator in oats can reduce plant lodging with reflections in biomass and grain yield. The objective of the study was to determine the feasibility and efficiency of using Trinexapac-Ethyl regulator in the growth of white oat under different conditions of N-fertilizer and years favorable and unfavorable for cultivation. In this study, two experiments were conducted in the years 2011, 2012 and 2013, one for quantifying biomass production rate and the other for the determination of grain yield and lodging. The experimental design was randomized blocks with four replicates, in a 4 x 3 factorial scheme, for growth regulator doses (0, 200, 400 and 600 mL ha-1) and nitrogen doses (30, 90 and 150 kg ha-1), respectively. There is a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Trinexapac-ethyl; Lodging; Nitrogen; Regression.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000300163

Growth and yield of strawberry plants fertilized with nitrogen and phosphorus
Provedor de dados: 91
Autores: Medeiros,Reinaldo F.; Pereira,Walter E.; Rodrigues,Rummenigge de M.; Nascimento,Ronaldo do; Suassuna,Janivan F.; Dantas,Tony A. G.
ABSTRACTStrawberry (Fragaria x ananassa) is a crop that has rapid growth and is highly influenced by fertilization. Due to its development speed, the plant needs to absorb sufficient macronutrients in order to meet its demand. The objective of this research was to evaluate growth and yield of strawberry under different doses of nitrogen (N), phosphorus (P) and potassium (K) fertilization. The treatments, using Box's central composite design, were distributed in randomized blocks with four replicates and consisted of five N doses (0.16, 0.37, 0.88, 1.4 and 1.6 g plant-1) and five P doses (0.3, 0.58, 1.2, 1.8 and 2.1 g plant-1), in the presence (1.67 g plant-1) and absence of K. Seedlings of the cultivar 'Oso Grande' were cultivated in 10-L pots. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa Duch.; Nitrogen; Phosphorus; Potassium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900865

Growth and yield of colored-fiber cotton grown under salt stress and nitrogen fertilization
Provedor de dados: 91
Autores: Lima,Geovani S. de; Dias,Adaan S.; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Nobre,Reginaldo G.; Souza,Leandro de P.
ABSTRACT This research was conducted in order to evaluate the growth and production of colored-fiber cotton, cv. ‘BRS Rubi’, irrigated with water of different salinities and nitrogen (N) doses. The experiment was carried out in drainage lysimeters filled with soil material from an eutrophic Regolithic Neosol with sandy-loam texture under greenhouse conditions in Campina Grande, PB. The experiment was conducted in a randomized block design and the treatments consisted of five levels of irrigation water salinity with the following electrical conductivities - ECw (5.1, 6.1, 7.1, 8.1 and 9.1 dS m-1), combined with five N doses - ND (65; 100; 135; 170; 205 mg of N kg-1 of soil), distributed in a 5 x 5 factorial scheme with three replicates. The growth of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum L.; Saline water; Nitrogen; BRS Rubi.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600415

Production and economic viability of banana managed with cover crops
Provedor de dados: 91
Autores: Barbosa,Francisca E. L.; Lacerda,Claudivan F. de; Amorim,Aiala V.; Costa,Raimundo N. T.; Silva,José A. da; Hernandez,Fernando F. F.
ABSTRACT This research aimed to evaluate the yield and economic viability of three crop cycles of the banana cv. ‘Prata Anã’ in association with perennial herbaceous legumes, natural vegetation, or compared with the conventional management. The research was conducted using a complete randomized block design with split-split plots and four replicates. The plots were formed by four irrigation depths: 50, 75, 100 and 125% of crop evapotranspiration, and the subplots by cover crops (Calopogonium muconoides, Pueraria phaseoloides, and natural cover without N addition) or no cover crops with addition of N fertilization (conventional management). The subsubplots were formed by the second, third and fourth banana production cycles. Yield and economic viability of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Perennial legumes; Musa spp.; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201078

Oat yield through panicle components and growth regulator
Provedor de dados: 91
Autores: Marolli,Anderson; Silva,José A. G. da; Mantai,Rubia D.; Brezolin,Ana P.; Gzergorczick,Maria E.; Lambrecht,Darlei M.
ABSTRACT The growth regulator modifies the expression of lodging and panicle components in oat plants, with reflexes in yield. The objective of this study was to define the optimal dose of growth regulator in oat for a maximum lodging of 5%. In addition, this study aimed to identify potential variables of the panicle to compose the multiple linear regression model and the simulation of grain yield in conditions of use of the regulator under low, high and very high fertilization with nitrogen. The study was conducted in 2011, 2012 and 2013 in a randomized block design with four replicates in a 4 x 3 factorial scheme, for growth regulator doses (0, 200, 400 and 600 mL ha-1) and N-fertilizer doses (30, 90 and 150 kg ha-1), respectively. The growth regulator...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Nitrogen; Trinexapac-ethyl; Multiple linear regression.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400261

Growth and gas exchanges in soursop under irrigation with saline water and nitrogen sources
Provedor de dados: 91
Autores: Silva,Evandro M. da; Lima,Geovani S. de; Gheyi,Hans R.; Nobre,Reginaldo G.; Sá,Francisco V. da S.; Souza,Leandro de P.
ABSTRACT Nitrogen (N) fertilization has been tested for the mitigation of salt stress in some species including fruit crops. However, special attention should be paid to the source of N, due to the different compositions and saline indices of the fertilizers, particularly when irrigation is conducted using waters with salinity levels that are restrictive to agriculture. Thus, this study evaluated the effect of fertilization with N sources on the growth and gas exchanges of soursop irrigated with saline water after transplanting. The experiment was carried out in greenhouse at the Center of Technology and Natural Resources of the Federal University of Campina Grande, and treatments were arranged in randomized blocks, in 4 x 4 factorial scheme, corresponding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona muricata L.; Salinity; Nitrogen; Photosynthesis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100776

Simulation of oat development cycle by photoperiod and temperature
Provedor de dados: 91
Autores: Mantai,Rubia D.; Silva,José A. G. da; Marolli,Anderson; Mamann,Ângela T. W. de; Sawicki,Sandro; Krüger,Cleusa A. M. B.
ABSTRACT The simulation of oat development cycle can be used in the planning of agricultural practices. The aim of the study was to simulate and validate the duration of oat development cycle by photoperiod, temperature and coefficients of development of wheat for use in the WE-Streck model, considering different doses of N-fertilizer and systems of succession of high and low C/N ratio. The study was conducted in 2015 in a randomized block design with four replicates in a 4 x 2 factorial scheme, corresponding to N rates (0, 30, 60 and 120 kg ha-1) and oat cultivars (Barbarasul and Brisasul), respectively, in the soybean/oat and maize/oat systems. The duration of the stages from emergence to anthesis and from anthesis to maturation of oats was simulated in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativat; Succession system; Nitrogen; WE-Streck model.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100003

Addition of nitrogen had no effect on yield and quality of apples in an high density orchard carrying a dwarf rootstock
Provedor de dados: 94
Autores: Ernani,Paulo Roberto; Rogeri,Douglas Antônio; Proença,Marcelo Machado; Dias,Jaques.
The effect of N addition on apple yield and quality may vary according to the tree vigor. Apple trees developed over vigorous rootstocks had shown no response to N application in Brazil. In this study it was evaluated the effect of N addition to the soil on yield and quality of ´Royal Gala´ apples grafted on a dwarf rootstock (M.9). The orchard was planted in 1995 (2,857 trees ha-1) on an Oxisol containing 40 g kg-1 of organic matter and pH 6.0. The experiment was carried out from 1998 up to 2005. Treatments consisted of rates of N (0, 50, 100 and 150 kg ha-1 year-1 from 1998 to 2001, and respectively 0, 100, 200 and 300 kg ha-1 afterwards), all broadcasted within the tree row in two equal splits, at bud break and after harvest, as ammonium sulfate....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apple yield; M.9 rootstock; Fruit quality; Nitrogen.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452008000400044

RELATIONSHIP BETWEEN YIELD AND FRUIT QUALITY OF PASSION FRUIT C03 PROGENIES UNDER DIFFERENT NUTRITIONAL LEVELS
Provedor de dados: 94
Autores: SANTOS,CARLOS LACY; VIANA,ALEXANDRE PIO; FREITAS,MARTA SIMONE MENDONÇA DE; CARVALHO,ALMY JUNIOR CORDEIRO DE; RODRIGUES,DANIELE LIMA.
ABSTRACT  The present study was conducted to evaluate different fertilization-management strategies in ten progenies of passion fruit from the third recurrent selection cycle and their effects on yield and fruit-quality traits. For this purpose, we adopted the strategy of correlations analysis, using the phenotypic and path correlations in different environmental conditions characterized by three levels of fertilization. The trial was set up as a randomized-block design in a split-plot arrangement with progenies representing the plots and three levels of potassium-nitrogen fertilization as the sub-plots, with three replicates. Path analysis showed that number of fruits was the variable of highest correlation with fruit diameter at fertilization I. Fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pomology; Nitrogen; Potassium; Passiflora edulis Sims; Path analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000203002

Phosphate and nitrogen fertilization in the production of Barueiro (Dipteryx alata Vog.) seedlings
Provedor de dados: 94
Autores: Pinho,Erika Katianne Costa; Costa,Ana Claudia; Vilar,Cesar Crispim; Souza,Manoel Euzébio de; Silva,Aline Borges Vilela; Oliveira,Carlos Henrique Gomes de.
Abstract  Barueiro (Dipteryx alata Vog.), a fruit tree native to the Brazilian cerrado, has aroused the interest of producers and consumers due to its almond highly appraised and valued by local markets. To obtain quality barueiro seedlings, balanced fertilization is required, with special attention to the supply of phosphorus and nitrogen, essential for seedling growth and establishment in the field. The aim of this study was to evaluate the growth of barueiro seedlings produced with different phosphate and nitrogen concentrations in Nova Xavantina – MT. The experiment was conducted at the seedling nursery of the Mato Grosso State University (UNEMAT), Campus of Nova Xavantina - MT, from December 2017 to April 2018. The experimental design was randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baru; Phosphorus; Nitrogen; Propagation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000603001

Yield and botanical composition of a mixed grass-legume pasture in response to maintenance fertilization
Provedor de dados: 96
Autores: Andrade,Carlos Mauricio Soares de; Valentim,Judson Ferreira; Pereira,João Batista Martiniano; Ferreira,Aliedson Sampaio.
This study was carried out on a low-productive Brachiaria brizantha cv. Marandu pasture, mixed with Arachis pintoi cv. Belmonte (forage peanut), established 13 years ago in a Red-Yellow Latosol in Acre State, western Brazilian Amazon. The purpose was to evaluate the response of this pasture to different fertilizer combinations, aiming at identifying the nutritional factors responsible for the fall of pasture carrying capacity and for the reduced vigor of forage peanut. It was used a randomized complete block design, with three replications and 12 combinations of nitrogen, phosphorus, potassium, lime, sulfur, and micronutrients (100 kg/ha of N, P2O5 and K2O; 300 kg/ha of dolomitic lime; 30 kg/ha of sulfur and FTE BR-10). Fertilizers were broadcast in 5 ×...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Arachis pintoi; Brachiaria brizantha; Nitrogen; Pasture degradation; Phosphorus.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000800003

Urea in sugarcane-based diets for dairy cows
Provedor de dados: 96
Autores: Santiago,Alberto Magno Ferreira; Campos,José Maurício de Souza; Oliveira,André Soares de; Valadares Filho,Sebastião de Campos; Santos,Stefanie Alvarenga; Souza,Shirley Motta de; Santiago,Iara Furtado.
We evaluated the effect of adding four levels (0, 4, 8 and 12 g/kg, as fed) of a mixture (9:1) of urea and ammonium sulfate (UAs) to sugarcane on feed intake and digestibility, productive performance and metabolism of nitrogen compounds of dairy cows. Twelve multiparous Holstein cows (12.6±0.5 kg/d of milk, 225±90 days in milk) were distributed in three 4 × 4 Latin squares, receiving diets with the same amount of nitrogen (125 g crude protein/kg of dry matter). Concentrate feed was supplied at a ratio of 1 kg for each 3 kg of milk produced. The sugarcane presented 21.9 ºBrix. The level of UAs did not affect intake, total digestibility of diet components, milk production or milk components. Increasing UAs level linearly increased concentration of plasma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metabolism; Milk production; Nitrogen.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000600010

Strategies for mitigation of nitrogen environmental impact from swine production
Provedor de dados: 96
Autores: Monteiro,Divanildo Outor; Pinheiro,Victor Manuel Carvalho; Mourão,José Luís Medeiros; Rodrigues,Miguel António Machado.
This work presents strategies that can be implemented in order to minimize the environmental impact of swine slurry on soil, water, and air. This reduction can be achieved through decrease in nitrogen excretion and ammonia emissions. The correct feed formulation according to animal requirements, the increase in diet digestibility and improvement in animal performance can reduce nitrogen excretion. The use of additives either in the diet or in the manure as well as some equipment rearrangements can reduce ammonia emission.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Excretion; Emissions; Environment; Nitrogen; Swine.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300035

Nitrogen fertilization strategies for xaraes and tifton 85 grasses irrigated in the dry season
Provedor de dados: 96
Autores: Queiroz,Domingos Sávio; Menezes,Maria Angélica Chamon; Oliveira,Rubens Alves de; Viana,Maria Celuta Machado; Silva,Edilane Aparecida da; Ruas,José Reinaldo Mendes.
An experiment was carried out to assess rates and nitrogen fertilization strategies on the forage yield using irrigation to supply the water deficit during the dry season. The grasses Cynodon spp cv. tifton 85 and Brachiaria brizantha cv. Xaraés were cultivated with nitrogen (N) at levels of 200 and 400 kg/ha according to strategies: 1) half dose applied during the rainy season (RS) and half during the dry season (DS); 2) 1/3 during the RS and 2/3 during the DS; 3) 2/3 during the RS and 1/3 during the DS; 4) all doses applied during the DS. In each season the dose was divided in three applications. Eleven harvests were conducted: six in the RS and five in the DS. When 2/3 of N was applied in the DS, forage yield in this period was statistically equivalent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Cynodon spp; Nitrogen; Pasture irrigation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800005

Dry matter yield and nutritional value of Marandu grass under nitrogen fertilization and irrigation in cerrado in São Paulo
Provedor de dados: 96
Autores: Dupas,Elisângela; Buzetti,Salatiér; Sarto,André Luis; Hernandez,Fernando Braz Tangerino; Bergamaschine,Antonio Fernando.
The aim of this study was to evaluate dry matter yield and nutritional value of palisade grass (Brachiaria brizantha cv. Marandu) using nitrogen doses and sprinkler irrigation in two periods of the year, aiming at reducing seasonality of forage production. It was used a randomized block design in a split-plot scheme, with five doses of nitrogen (0, 50, 100, 150, and 200 kg/ha/cut), and the sub-plots were defined by the seasons of the year (wet and dry season), with and without irrigation. During the wet season, in the plots with and without irrigation, doses of 175 and 161 kg/ha/cut promoted the highest dry matter yields. During the dry season, 171 kg ha-1N with irrigation resulted in the highest dry matter yield. During the same season, there was no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Nitrogen; Pasture.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200006

Impact of dietary manipulation on nutrient flows and greenhouse gas emissions in cattle
Provedor de dados: 96
Autores: Kebreab,Ermias; Strathe,Anders; Fadel,James; Moraes,Luis; France,James.
The growing global demand for meat and particularly in countries such as Brazil is expected to increase intensive animal production. Consequently the main pollutants of interest are nitrogen (N), phosphorus (P) and greenhouse gases (GHG). Nitrogen can be a problem through nitrate leaching to water bodies, ammonia, and nitrous oxide emissions to air. Phosphorus loading in soil from manure application can be the main issue due to the tendency of P to accumulate in soil and leach to groundwater and rivers. The sources of agricultural GHG emissions include methane from enteric fermentation, manure storage and spreading, and nitrous oxide mainly from application of manure on land. Dietary manipulation has proven to be an effective tool to reduce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Nitrogen; Phosphorus; Pollution; Ruminants.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300050

Canopy structure and forage nutritive value of elephantgrass subjected to different stocking rate and N fertilization in the “Mata Seca” ecoregion of Pernambuco
Provedor de dados: 96
Autores: Dourado,Diego Loiola; Dubeux Junior,José Carlos Batista; Mello,Alexandre Carneiro Leão de; Santos,Mércia Virginia Ferreira dos; Lira,Mário de Andrade; Freitas,Erinaldo Viana de; Apolinário,Valéria Xavier de Oliveira; Santos,Erick Rodrigo da Silva.
ABSTRACT The objective was to evaluate the effect of three stocking rates (2, 3.9, and 5.8 animal units ha−1) and three fertilization levels (0, 150, and 300 kg N ha−1 yr−1) on herbage mass and nutritive value of elephantgrass (Pennisetum purpureum Schum.) cv. IRI-381. The experiment was conducted from May to August of 2009 and 2010 in Itambé, PE, Brazil, during the rainy season. Treatments were allocated in a split-plot arrangement in a completely randomized block design. The variables measured included leaf mass (pre- and post-grazing), botanical composition, soil cover, leaf area index, light interception, leaf angle, and concentrations of dry matter, organic matter, N, and in vitro digestible dry matter. When fertilized with 300 kg N ha−1 yr−1, leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing; Livestock; Nitrogen; Pasture; Pennisetum purpureum.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100400

Ammonia volatilization from surface application of organic residues and urea on Marandu palisadegrass
Provedor de dados: 96
Autores: Vanin,Álisson; Menezes,June Faria Scherrer; Benites,Vinicius de Melo; Simon,Gustavo André.
The objective of this study was to measure ammonia volatilization from surface application of pig slurry, poultry litter, urea and no fertilization. An experiment was conducted in a randomized block design, in plots repeated over time, with four treatments and four replications. The fertilizers tested were: mineral fertilizer (70 kg ha-1 N, 100 kg ha-1 P2O5 and 30 kg ha-1 of K2O, as urea, triple superphosphate and potassium chloride, respectively), pig slurry (200 m³ ha-1 applied in November 2008 and 200 m³ ha-1 applied in April 2009) and poultry litter (10 t ha-1 applied in November 2008 and 10 t ha-1 applied in April 2009). Five evaluations were performed with 24-hour intervals. Foams were used with glycerin and sulfuric acid, internally fixed in PET...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Losses; Nitrogen; Pig slurry; Poultry litter.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000400010

Oligotrophic patterns in southern Chilean lakes: the relevance of nutrients and mixing depth
Provedor de dados: 97
Autores: SOTO,DORIS.
Southern Chilean monomictic, temperate lakes are generally oligotrophic with high water transparency, low productivity and some apparent resistance to disturbances such as phosphorus additions. This paper attempts to explain low chlorophyll-a values using descriptive and experimental approaches. Three different scales are used, (a) a micro scale both in space and time, with experimental manipulations of N, P and total light in 24 enclosures in lake Llanquihue, (b) a longer time scale analysing 18 months of data in several sites within lake Llanquihue grouped as salmon farming sites, town bays and control sites, and (c) a broader time scale (9 years) by monitoring lakes Puyehue, Rupanco and Llanquihue, all in the Araucanian lake region and Yelcho lake in...
Tipo: Journal article
Palavras-chave: Oligotrophy; Mixing depth; Nitrogen; Temperate lakes.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200009

Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid)
Provedor de dados: 124
Autores: Alves,Luiziene Soares; Torres Junior,Carlos Vergara; Fernandes,Manlio Silvestre; Santos,André Marques dos; Souza,Sonia Regina de.
ABSTRACT Sunflower plants are source of oilseeds with great importance for agroenergy. Nitrogen deficiency is considered one of the factors limiting growth and yield. The objective of this study was to assess the nitrogen uptake (high and low supply of nitrate and ammonium) and to determine the uptake kinetics parameters (Km and Vmax) of these ions in sunflower plants (Neon hybrid). The experiment was carried out in a growth chamber using a hydroponic system. The following treatments were applied: 0.2 and 2.0 mmol L-1 of N-NO3- and N-NH4+. The two kinetics parameters (Km and Vmax) involved in the uptake of nitrate and ammonium were determined, as well as the soluble fractions (N-NO3-, N-NH4+, amino-N and sugars) and total N, in different plant tissues. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Oilseed plants; Total N; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013

Application of molybdenum and a desiccant herbicide to the common bean under direct seeding
Provedor de dados: 124
Autores: Camelo,Gessimar Nunes; Araújo,Geraldo Antonio de Andrade; Fontes,Renildes Lúcio Ferreira; Dias,Luiz Antonio dos Santos; Carneiro,José Eustáquio de Souza.
ABSTRACTApplying micronutrients together with the herbicides used in plant desiccation can ensure an adequate supply of these nutrients and a reduction in production costs under a direct seeding (DSS) system. The aim of this study was to evaluate the effect of dosages of molybdenum (Mo), applied both in a desiccation operation together with glyphosate on the straw of brachiaria (Brachiaria brizantha) and separately via the leaves, on the common bean (cultivar Ouro Vermelho) grown under DSS. A randomised block design was used with four replications in an arrangement of sublots. In the lots, dosages of Mo (0, 0.1, 0.2, 0.4 and 0.8 kg ha-1) were applied together with the desiccant herbicide (glyphosate), and in the sublots, two dosages of Mo (0 and 100 g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria Brizantha; Desiccant herbicide; Nitrogen; Phaseolus vulgaris L.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000300573

Effect of fertilisation with urea on development in the ornamental bromeliad Aechmea fasciata
Provedor de dados: 124
Autores: Giampaoli,Patricia; Santos,Daniela Soares dos; Mollo,Luciana; Kanashiro,Shoey; Tavares,Armando Reis.
ABSTRACT The aim of this study was to evaluate the effect of urea fertiliser on the bromeliad, Aechmea fasciata. Plants were submitted to weekly treatments with a solution of 0.0, 0.5, 1.0, 1.5 or 2.0 g urea L-1. After 210 days of the experiment, biometric variables of growth and development of the root and shoot systems were analysed, together with foliar levels of chlorophyll a and b, and of carotenoids. The experimental design was of randomised blocks with four replications; eight plants were used per plot. The data were submitted to regression analysis. The highest values for chlorophyll a and carotenoid content were obtained at a concentration of 1.23 g L-1 urea, and for chlorophyll b at a concentration 1.75 g L-1 urea. Plants of A. fasciata submitted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Nitrogen; Mineral nutrition; Chlorophyll.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000400657

Seed inoculation with Azospirilum brasiliense in corn plants submitted to water limitation
Provedor de dados: 22
Autores: Coelho, Antônio Eduardo; Tochetto, Cláudia; Turek, Thais Lemos; Michellon, Luiz Henrique; Fioreze, Samuel Luiz.
The objective of this work was to evaluate the seed inoculation with Azospirilum brasilense in corn plants under limitation of the water supply. Two assays were carried out in greenhouse conditions, using low nitrogen substrate pots. At first one, corn seeds were inoculated or not with A. brasilense and treated or not with a biostimulant (IBA+GA+KT). At the second experiment, two corn genotypes were inoculated or not with A. brasilense. In both assays, plants were submitted to limited condition of water supply at initial vegetative growth. During this period gas exchange parameters were determined at the plants. After stress period, dry matter and nitrogen content were determined in roots and above ground parts of the plants. In addition, substrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diazotrophic bacterium; Environmental stress; Nitrogen; Zea mays.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14004

General principIes of cryosurgery in the treatment of tumors in small animals: literature review
Provedor de dados: 195
Autores: de Queiroz, Genilson Fernandes; Matera, Julia Maria.
Objective: To disclose the technique, equipment, mechanism of action, indications, advantages and disadvantages, complication and/or after-effects of cryosurgery in treatment of lesions. Data Sources: Data search was carried out in data base systems of CAB and MEDLINE over a 30-year term. Data Synthesis: Cryosurgery consists of the treatment of lesions through freezing (liquid nitrogen at -196° C).It has been used in medicine for the treatment of skin, liver, kidneys, prostate and oral cavity neoplasias. In. veterinary medicine it is still not broadly known and literature lacks information as to its application. It is an easily performed procedure, requiring however knowledge of the technique, of indications and possible complications and after-effects....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryogenic surgery; Cryotherapy; Freezing techniques; Hyperthermia  induced; Cryogenics; Nitrogen; Neoplasms; Pets Criocirugía. Crioterapia. Congelamiento; Hipotermia inducida; Criogénicos; Nitrógeno; Neoplasmas; Animales domésticos criocirurgia; Crioterapia; Congelamento; Hipotermia induzida; Criogênicos; Nitrogênio; Neoplasias; Animais domésticos.
Ano: 2003
URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/3258

GRAZING MANAGEMENT, AMMONIA AND NITROUS OXIDE EMISSIONS: A GENERAL VIEW
Provedor de dados: 127
Autores: Núñez,Pedro; Demanet,Rolando; Matus,Francisco; Mora,Maria de la Luz.
The grazing management of grassland has a direct effect on nitrogen (N) recycling. This is an important reason why management has become an alternative to improve the grassland production and quality, in turn to make it more suitable for the environment. However, the livestock system intensification induces changes in the natural dynamics of the N cycle, accelerating gas emmisions (e.g. ammonia, NH3 and nitrous oxide, N(2)0) and leaching losses from soil under grazing. When the amount of N in the environment increases, there is an impact on smog episodes, global warming, stratospheric ozone depletion, acid rain and eutrophication of fresh water. There are different techniques to evaluate the gases emitted from the soil. This klonowledge is useful to design...
Tipo: Journal article
Palavras-chave: Ammonia; Grazing; Management; Nitrogen; Nitrous oxide; Livestock.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300006

MOVEMENT OF N0(3)-N AND NH4-N IN AN ANDISOL AND ITS INFLUENCE ON RYEGRASS PRODUCTION IN A SHORT TERM STUDY
Provedor de dados: 127
Autores: Mora,María de la Luz; Cartes,Paula; Núñez,Pedro; Salazar,Mauricio; Demanet,Rolando.
In acids soils, the use of ammonium fertilizers accelerates the acidification processes and decreases both the production and persistence of the pastures. Nitrogen (N) is the most limiting factor for plant growth in most agricultural systems, but also it is one of the major environmental issues worldwide. In Chile, neither systematic studies in the first period of pasture growth and nor N leaching losses associated have been reported. The aims of this study were: (i) to evaluate the effect of the N sources at increasing rates of application on the yield and quality of ryegrass (Lolium perenne) and (ii) to quantify in the short-term the N potential leaching losses and the pH changes throughout the soil profile under field conditions. A field experiment was...
Tipo: Journal article
Palavras-chave: Ammonium; Leaching; Nitrate; Nitrogen; Pasture.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000200005

LIVESTOCK PRODUCTION AND DIFFUSE POLLUTION IN A VOLCANIC SOIL
Provedor de dados: 127
Autores: Alfaro,Marta; Salazar,Francisco.
In developed countries, intensive grazing has been related to water pollution. The results of several projects carried out on a volcanic soil of the Osorno soil series on beef grazing production systems have shown that grazing management did not increase total nitrogen (N) and phosphorus (P) transfer and losses. Due to the high water infiltration capacity of the soil, runoff was &lt;1% of total drainage, therefore, N and P losses in runoff were small. Nitrogen leaching losses were high (3 up to 71 kg N ha-1 yr-1). Nitrogen loss in runoff was mainly lost as DON (c. 50%) while N leaching losses were mainly as nitrate (c. 70%). Total P losses ranged between 1 and 22 g P ha-1 yr-1 and they increased with increasing field slopes. Phosphorus was mainly lost as...
Tipo: Journal article
Palavras-chave: Nitrogen; Phosphorus; Dairy production; Beef production; Environmental impact.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200002

GROWTH OF Inga vera WILLD. SUBSP. Affinis UNDER RIZOBIA INOCULATION
Provedor de dados: 127
Autores: Maia,Julio; Scotti,Maria Rita.
Nitrogen, in general, is the largest limiting plant growth nutrient in the tropics and is required as a synthetic fertilizer to improve plants productivity. Therefore, studies aiming in understanding and using nitrogen fixation by leguminous trees have been done as a low-cost alternative for chemical fertilizer. Native legume trees such as Inga vera have been recommended in the rehabilitation of degraded areas due their ability to establish symbiosis with nitrogen fixation organisms replacing nitrogen fertilization. These species are able to increase soil organic matter, nitrogen and phosphorus availability. Thus, the present study aims to assess the inoculation effects of native rhizobia strains on nodulation, dry matter production, nitrogen and...
Tipo: Journal article
Palavras-chave: Nitrogen; Fertilizer; Symbiotic efficiency.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200005

Mineral supplementation and productivity of the Shiitake mushroom on eucalyptus logs
Provedor de dados: 63
Autores: Queiroz,Elvio Cardoso; Marino,Regina Helena; Eira,Augusto Ferreira da.
Brazilian reports on Shiitake mushroom [Lentinula edodes (Berkeley) Pegler] productivity grown on Eucalyptus saligna (Sm.) logs are optimistic. The current production on this kind of wood is, however, low and variable. Aiming at increasing Shiitake mushroom productivity, the present work studied interactions among three concentrations of mineral supplement and three Shiitake strains (Le 95/01, 96/17 and 96/18) grown on seventh cut eucalyptus logs. Mineral fertilization was carried out when the logs were submerged in water to induce fruiting bodies, using the following saline concentrations: zero (no fertilizers added), 0.05% (equivalent to 0.35 g L-1 of ammonium sulfate with 18% nitrogen and 0.15 g L-1 of superphosphate with 34% phosphorus) and 0.50%....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lentinula edodes; Nitrogen; Phosphorus.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300003

Grain yield and kernel crude protein content increases of maize hybrids with late nitrogen side-dressing
Provedor de dados: 63
Autores: Silva,Paulo Regis Ferreira da; Strieder,Mércio Luiz; Coser,Rúbia Patrícia da Silva; Rambo,Lisandro; Sangoi,Luís; Argenta,Gilber; Forsthofer,Everton Leonardo; Silva,Adriano Alves da.
Physiological changes incorporated into current maize hybrids suggest the occurrence of modifications in the nitrogen uptake dynamics, improving plant ability to uptake N during grain filling. This may justify late N side-dressing whenever environmental constraints prevent adequate nitrogen supply during crops vegetative development. This study evaluates effects of nitrogen fertilization at booting and silking on grain yield and kernel crude protein contents of commercial maize hybrids. Two experiments were set up in Eldorado do Sul, RS, during the 2001/2002 and 2002/2003 growing seasons. In 2001/2002, treatments were composed of two hybrids (Agroceres 303 and Pioneer 32R21), three nitrogen rates applied during maize vegetative development (30, 80 and 130...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Nitrogen; Fertilization timing; Productivity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500014

Lethal concentration (CL50) of un-ionized ammonia for pejerrey larvae in acute exposure
Provedor de dados: 63
Autores: Piedras,Sérgio Renato Noguez; Pouey,Juvêncio Luís Osório Fernandes; Moraes,Paulo Roberto Rocha; Cardoso,Daniela Fençon.
Ammonia results from decomposition of effluents organic matter, e.g. feed wastes and fish faeces. Its un-ionized form can be toxic because diffuses easily through fish respiratory membranes, damaging gill epithelium and impairing gas exchanges. The objective of this work was determining the 96-hour CL50 of un-ionized ammonia for newly hatched pejerrey Odontesthes bonariensis larvae. Trials were set up completely randomized design, with three different concentration of un-ionized ammonia (0.57, 0.94, and 1.45 mg L-1 NH3-N) and a control treatment (n = 3). Experimental units were 20-L, aerated aquaria stocked with 20 larvae (average weight 3.9 mg). Pejerrey larvae exposed to un-ionized ammonia during 96 hours present 50% mortality at 0.71 mg L-1 NH3-N.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Pejerrey; Odontesthes bonariensis; Toxicity; Nitrogen; Larvae.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200011

Effect of observed individual data of performance and excretion on life cycle assessment of piglets
Provedor de dados: 63
Autores: Monteiro,Alessandra Nardina Trícia Rigo; Dourmad,Jean-Yves; Fachinello,Marcelise Regina; Diaz-Huepa,Laura Marcela; Sitanaka,Natália Yoko; Partyka,André Vinícius Sturzenegger; Pozza,Paulo Cesar.
ABSTRACT: The objective was to evaluate the impact of producing piglets fed diets with different crude protein (CP) levels through life cycle assessment and experimental data. In Trial I (performance), 28 crossbred barrow piglets, with an initial average weight of 15.3 ± 1.15 kg were divided into a randomized block design with four treatments, seven replications and one animal per experimental unit. In Trial II (nitrogen and phosphorus balance), 20 crossbred barrow piglets with an average weight of 21.4 ± 1.62 kg were divided in a randomized block design with four treatments, five replications and one animal per experimental unit. Four experimental feeds were evaluated: HighCP, CP18, CP17 and LowCP, with 19, 18, 17 and 16 % of CP, meeting the requirements...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal variability; Dietary crude protein; Environment; Nitrogen; Weaners.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200102

Growth, development, and fertilizer-15N recovery by the coffee plant
Provedor de dados: 63
Autores: Fenilli,Tatiele Anete Bergamo; Reichardt,Klaus; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuze; Favarin,José Laercio; Costa,Flávio Murilo Pereira da; Bacchi,Osny Oliveira Santos.
The relationship between growth and fertilizer nitrogen recovery by perenial crops such as coffee is poorly understood and improved understanding of such relations is important for the establishment of rational crop management practices. In order to characterize the growth of a typical coffee crop in Brazil and quantify the recovery of 15N labeled ammonium sulfate, and improve information for fertilizer management practices this study presents results for two consecutive cropping years, fertilized with 280 and 350 kg ha-1 of N, respectively, applied in four splittings, using five replicates. Shoot dry matter accumulation was evaluated every 60 days, separating plants into branches, leaves and fruits. Labeled sub-plots were used to evaluate N-total and 15N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Stable isotope; Nitrogen; Dry matter accumulation; 15N.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500012

Rates of calcium, yield and quality of snap bean
Provedor de dados: 63
Autores: Favaro,Simone Palma; Braga Neto,José Antônio; Takahashi,Hideaki Wilson; Miglioranza,Édison; Ida,Elza Iouko.
Calcium ions (Ca) play an important role in many biochemical processes, delaying senescence and controlling physiological disorders in fruits and vegetables. The objective of this experiment was to analyze the effect of increasing calcium concentrations in snap beans. Snap bean cultivar UEL 1 was sown in sand containing 80 mg L-1 of calcium supplemented with nutrient solution, plus calcium at different contents: 0, 75, 150 and 300 mg L-1. Ca was mainly recovered in the shoots, followed by roots and pods. Calcium concentrations in the pods were 130, 259, 349 and 515 mg 100 g-1dry matter on a dry weight basis, in relation to the enhancement of calcium contents in the nutrient solution, respectively. A negative relationship between nitrogen content in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Biomass production; Pod; Nutrient solution; Nitrogen.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600009

Nitrogen and silicon fertilization of upland rice
Provedor de dados: 63
Autores: Mauad,Munir; Crusciol,Carlos Alexandre Costa; Grassi Filho,Hélio; Corrêa,Juliano Corulli.
Silicon is not considered an essential element for plant development and growth, but its absorption brings several benefits to some crops, especially rice, by increasing cellular wall thickness, providing mechanical resistance to the penetration of fungi, improving the opening angle of leaves and making them more erect, decreasing self-shading and increasing resistance to lodging, especially under high nitrogen rates. To evaluate the effects of nitrogen and silicon fertilization on vegetative and yield components, plant height, and yield of rice cultivar IAC 202, an experiment was carried out combining three nitrogen rates (5, 75 and 150 mg N kg-1 soil) applied as urea, and four silicon rates (0, 200, 400 and 600 mg SiO2 kg-1 soil) applied as calcium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Silicon; Nitrogen; Yield components.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400023

Rates and methods of applying urea to common beans
Provedor de dados: 63
Autores: Kiehl,J.C.; Silveira,R.I.; Brito Neto,J.
The effect of rate and method of urea application on the yield of common beans (Phaseolus vulgaris L., cv. IPA-1) was evaluated on a Red-Yellow Latosol (Psamentic Haplortox) of Arapiraca and on a Solodic Planosol (Ustalf) of Igaci, both sandy-clay-loams located in the State of Alagoas, Brazil. Rates of 30,60 and 90 kg N/ha were applied placing the urea totally in the furrow at planting time; totally sidedressed twenty days after planting, mixed or not with the soil; or 1/3 of the amount in the furrow at planting plus 2/3 sidedressed twenty days after planting, mixed or not with the soil. Bean yield responses to nitrogen followed quadratic equations. In the Red-Yellow Latosol response to nitrogen occurred up to the rate of 66 kg N/ha, while in the Solodic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bean; Urea; Nitrogen; Method of application.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200013

Stalk yield and technological attributes of planted cane as related to nitrogen fertilization
Provedor de dados: 63
Autores: Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Carlos Eduardo,Faroni; Vitti,André Cesar; Otto,Rafael.
A still unclear question related to sugarcane cropping refers to the low response of the planted cane to nitrogen fertilization. Two experiments were carried out in areas under a Typic Hapludox, located in Pirassununga, São Paulo State, Brazil, and an Arenic Kandiudult, located in Jaboticabal, São Paulo State, Brazil, with the objective to evaluate planted cane response to nitrogen fertilization at planting. The experimental design was organized as random blocks and treatments consisted of three N rates (40, 80, and 120 kg ha-1 N-urea) and a control without N. Nitrogen fertilizers were applied to the bottom of the planting furrow and then incorporated into the soil. During the maximum growth stage, +1 leaf samples were collected from all experimental plots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500012

Nitrogen dynamics in a soil-sugar cane system
Provedor de dados: 63
Autores: Oliveira,Júlio César Martins de; Reichardt,Klaus; Bacchi,Osny O.S.; Timm,Luis Carlos; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuse; Tominaga,Tânia Toyomi; Navarro,Roberta de Castro; Piccolo,Marisa de Cássia; Cássaro,Fábio Augusto Meira.
Results of an organic matter management experiment of a sugar cane crop are reported for the first cropping year. Sugar cane was planted in October 1997, and labeled with a 15N fertilizer pulse to study the fate of organic matter in the soil-plant system. A nitrogen balance is presented, partitioning the system in plant components (stalk, tip and straw), soil components (five soil organic matter fractions) and evaluating leaching losses. The 15N label permitted to determine, at the end of the growing season, amounts of nitrogen derived from the fertilizer, present in the above mentioned compartments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizer; Nitrogen; N label; Soil; Sugar cane.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300015

Nitrate reductase activity in leaves and stems of tanner grass (Brachiaria radicans Napper)
Provedor de dados: 63
Autores: Cazetta,Jairo Osvaldo; Villela,Luciana Cristine Vasques.
Tanner grass (Brachiaria radicans Napper) is a forage plant that is adapted to well-drained soils or wetlands, and responds well to nitrogen (N) fertilization. The assimilation of N involves the nitrate reductase (NR) enzyme, and its activity seems to be dependent on N supply. Molybdenum (Mo) is also important because it is a cofactor of NR. In this study, the variables of an in vivo assay were optimized for measuring nitrate reductase activity (NRA) in the leaves and stem tissues. This method was used to evaluate NO3- metabolism in plants fertilized with NaNO3, NH4Cl or urea, in association with or without application of H2MoO4, aiming to provide guidelines for N management of this species. The best conditions to determine NRA involved the incubation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria arrecta; Nitrogen; Molybdenum; Enzyme.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600012

Morphogenesis on age categories of tillers in marandu palisadegrass
Provedor de dados: 63
Autores: Paiva,Adenilson José; Silva,Sila Carneiro da; Pereira,Lilian Elgalise Techio; Caminha,Fábio Olegário; Pereira,Priscila de Mesquita; Guarda,Vitor Del'Álamo.
Knowledge regarding morphogenetic characteristics has contributed to the understanding of plant responses to variations in climatic conditions and management practices. However, the original framework has been developed for temperate grass species, and indicates no ontogenetic effect on the expression of morphogenetic traits. Similar information for tropical grass species is scarce, but not less important. This experiment aimed at evaluating the influence of tiller age on the morphogenetic characteristics of continuously stocked marandu palisadegrass swards maintained at 30 cm and fertilized with nitrogen (N). Treatments corresponded to three nitrogen application rates (150, 300 and 450 kg ha-¹ of N) plus the control (no fertilization) and were assigned to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Tiller age; Nitrogen; Morphogenetic characteristics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600003

Cloning of putative ureG genes from Glomus intraradices and urease activities in tobacco arbuscular mycorrhizal roots
Provedor de dados: 63
Autores: Takahashi,Daniele; Ditt,Renata Fava; Lambais,Marcio R.
Even though the major benefit of arbuscular mycorrhizae is the increased uptake of phosphate from the soil solution and translocation to the plant, changes in the activity of enzymes involved in nitrogen (N) metabolism have been detected in mycorrhizal roots. Using differential display of reverse-transcripts of tobacco roots not-inoculated or inoculated with Glomus intraradices (Gi), we have cloned two partial cDNAs (NtGi2 and NtGi3). The presence of a conserved CobW/HypB/UreG domain and phylogenetic analyses suggest that NtGi2 and NtGi3 encode isoforms of urease accessory protein G (ureG) highly similar to ureG from fungi. The steady state levels of the putative ureG transcripts were shown to be higher in roots colonized by Gi, as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nicotiana tabacum; DDRT-PCR; Arbuscular mycorrhiza; Urea; Ammonium sulfate; Nitrogen.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200016

Isotopic composition of maize as related to N-fertilization and irrigation in the Mediterranean region
Provedor de dados: 63
Autores: Lasa,Berta; Irañeta,Iosu; Muro,Julio; Irigoyen,Ignacio; Aparicio Tejo,Pedro María.
Nitrate leaching as a result of excessive application of N-fertilizers and water use is a major problem of vulnerable regions. The farming of maize requires high N fertilization and water inputs in Spain. Isotopic techniques may provide information on the processes involved in the N and C cycles in farmed areas. The aim of this work was studying the impact of sprinkler and furrow irrigation and N input on maize (Zea mays L.) yields, and whether isotopic composition can be used as indicator of best farming practices. Trials were set up in Tudela (Spain) with three rates of N fertilization (0, 240 and 320 kg urea-N ha-1) and two irrigation systems (furrow and sprinkler). Yield, nitrogen content, irrigation parameters, N fate and C and N isotope composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Furrow irrigation; Nitrogen; Sprinkler irrigation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200008

Structural characteristics of marandu palisadegrass swards subjected to continuous stocking and contrasting rhythms of growth
Provedor de dados: 63
Autores: Mesquita,Priscila de; da Silva,Sila Carneiro; Paiva,Adenilson José; Caminha,Fábio Olegário; Pereira,Lilian Elgalise Techio; Guarda,Vítor Del'Álamo; Nascimento Júnior,Domicio do.
The concept of sward target has been used recently to characterise grazing management practices, but its efficiency to monitor and control sward structure questioned since it corresponds to a single sward structural feature, usually sward surface height. The objective of this experiment was to evaluate sward structure and its patterns of variation throughout the year on continuously stocked marandu palisadegrass swards maintained at 30 cm and subjected to contrasting rhythms of growth from January 2007 to April 2008. Treatments corresponded to three nitrogen application rates (150, 300 and 450 kg ha-1 of N) plus the control (no N fertilisation), and were allocated to experimental units according to a complete randomised block design, with four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Nitrogen; Sward structure; Sward height; Grazing management.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100004

Diallelic analysis for lysine and oil contents in maize grains
Provedor de dados: 63
Autores: Medici,Leonardo Oliveira; Gaziola,Salete Aparecida; Varisi,Vanderlei Aparecido; Paula,José Antonio Carmezini de; Ferreira,Renato Rodrigues; Azevedo,Ricardo Antunes.
Six S5 lines of maize, with differences for lysine and oil contents in grains, were used to carry out a complete series of diallelic crosses. The resulting 15 hybrids were grown in a field at two nitrogen levels (10 and 130 kg N ha-1). The general combining ability (GCA) and specific combining ability (SCA) were obtained by using the method 4, model I of Griffing for grain yield, and grain lysine and oil contents. Significant (p &lt; 0.001) interaction was observed between GCA and N levels for grain yield, indicating the selection of different lines for each N level. This interaction was not significant for lysine content, but there were significant effects of GCA for this trait at both N levels (p &lt; 0.1). Significant effects were not observed for GCA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cereal; Opaque; Nitrogen; Proteins; Near infrared.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200009

Isotopic view of vegetation and carbon and nitrogen cycles in a cerrado ecosystem, southeastern Brazil
Provedor de dados: 63
Autores: Coletta,Luciana Della; Nardoto,Gabriela Bielefeld; Latansio-Aidar,Sabrina Ribeiro; Rocha,Humberto Ribeiro da.
Carbon and nitrogen biogeochemical cycles in savannas are strongly regulated by the seasonal distribution of precipitation and pulses of nutrients released during the wetting of the dry soil and are critical to the dynamics of microorganisms and vegetation. The objective of this study was to investigate the spatial and temporal variability of C and N isotope ratios as indicators of the cycling of these elements in a cerrado sensu stricto area, within a protected area in a State Park in the state of São Paulo, Brazil. The foliar δ13C and δ15N values varied from -33.6 to -24.4 ‰ and -2.5 to 4.5 ‰, respectively. The δ13C values showed a consistent relationship with canopy height, revealing the importance of structure of the canopy over the C isotopic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Carbon; Nitrogen; Stable isotopes; Woody savanna.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400006

Nitrogen fertilization of fall panicum cultivars (Panicum dichotomiflorum Michx.): biochemical and agronomical aspects
Provedor de dados: 63
Autores: Soratto,Rogério Peres; Lima,Eduardo do Valle; Silva,Tiago Roque Benetoli da; Boaro,Carmen Sílvia Fernandes; Cataneo,Ana Catarina.
Information on improved fall panicum cultivars and agronomical pratices is scarce because of the relatively small importance of this crop in Brazil. The present study aimed to evaluate levels of nitrogen sidedressing on plant development and biochemical characteristics of two fall panicum cultivars. The experiment was set up under plastic tunnel conditions in Botucatu, São Paulo, Brazil, with plants growing inside asbestos-cement boxes. The experimental design was a randomized block setup and treatments consisted of six levels of nitrogen fertilization (0, 40, 80, 120, 160, and 200 mg L-1) applied at the onset of tillering on two fall panicum cultivars (AL Mogi and AL Tibagi). The application of increasing levels of nitrogen to fall panicum plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Sidedressing fertilization; Mineral nutrition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100014

Sward structure of marandu palisadegrass subjected to continuous stocking and nitrogen-induced rhythms of growth
Provedor de dados: 63
Autores: Pereira,Lilian Elgalise Techio; Paiva,Adenilson José; Silva,Sila Carneiro da; Caminha,Fábio Olegário; Guarda,Vitor Del'Álamo; Pereira,Priscila de Mesquita.
Acceleration of the growth rhythm of plants using nitrogen fertiliser alters the rates of physiological processes like growth and senescence and may cause significant changes in sward structure, interfering with plant and animal responses. The objective of this experiment was to evaluate sward structure of marandu palisadegrass (Brachiaria brizantha) maintained at 30 cm under continuous stocking and subjected to contrasting rhythms of growth from January 2007 to April 2008. These were generated using or not nitrogen fertiliser, and comprised four experimental treatments as follows: control (non-fertilised), 150, 300 and 450 kg ha-1 of N. Acceleration of the growth rhythm of plants was associated with increases in leaf and stem bulk density, and resulted in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbage bulk density; Morphological composition; Grazing management; Nitrogen.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500006

Winery distillery waste compost effect on the performance of melon crop under field conditions
Provedor de dados: 63
Autores: Villena,Raquel; Castellanos,María Teresa; Cartagena,María Carmen; Ribas,Francisco; Arce,Augusto; Cabello,María Jesús; Requejo,María Isabel.
ABSTRACT: The substantial generation of organic waste together with increasing interest in developing sustainable agriculture heralds an opportunity for mobilizing the recycling of these materials as a source of organic matter and nutrients into a viable management strategy option. A field experiment was conducted to evaluate the use of compost derived from waste produced by the winery and distillery industries in a drip-irrigated melon crop traditionally grown in the area where these wastes are generated. A randomized complete block design was used with four treatments consisting of three different dose levels of compost: 7 (D1), 13 (D2) and 20 (D3) t ha−1 and a control (D0) without the application of compost. The effects of these treatments on plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Growth; Yield; Nitrogen; Phosphorus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600494

Xylem sap nitrogen compounds of some Crotalaria species
Provedor de dados: 63
Autores: Vitória,Angela Pierre; Sodek,Ladaslav.
Thirteen species of Crotalaria were analysed for nitrogen compounds in the xylem root bleeding sap. Amino acids were the main form of organic nitrogen found, but only traces of ureides were present. Of the four species analysed for amino acid composition, asparagine was found to be the major amino acid, accounting for over 68% of the nitrogen transported. No striking deviations from this general pattern was found between species, between vegetative and floral stages of development, or between nodulated and non-nodulated plants. It was concluded that the Crotalaria species studied here have an asparagine-based nitrogen metabolism, consistent with many other non-ureide-producing legume species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria; Transport; Nitrogen; Amino acids; Asparagine.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300031

Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects
Provedor de dados: 63
Autores: Pitombo,Leonardo Machado; Carmo,Janaina Braga do; Maria,Isabela Clerici de; Andrade,Cristiano Alberto de.
The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three treatments:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolid; Nitrogen; Carbon dioxide; Methane; Nitrous oxide.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200147

Biodegradable oil-based polymeric coatings on urea fertilizer: N release kinetic transformations of urea in soil
Provedor de dados: 63
Autores: Bortoletto-Santos,Ricardo; Guimarães,Gelton Geraldo Fernandes; Roncato Junior,Vanderlei; Cruz,Diego Fernandes da; Polito,Wagner Luiz; Ribeiro,Caue.
ABSTRACT: Polymer coatings are used to control the rate of release of plant available nutrients from fertilizers as well as to reduce nutrient losses such as ammonia (NH3) volatilization. Although the literature presents several examples of materials used to coat urea, little is known about nitrogen (N) release properties such as the mechanism involved and phenomena (e.g., pore opening) in the polymer coating. Thus, this study investigated urea release from polyurethane (PU) derived from two renewable raw materials (castor oil and soybean oil), to explain how the oil structure and coating microstructure influence release and urea-N dynamics in soil. The results demonstrated that the profile of urea release and the urea-N mineralization in the soil could be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Controlled release; Plant nutrition; Soil fertility; Nitrogen.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101402

Root systems and soil microbial biomass under no-tillage system
Provedor de dados: 63
Autores: Venzke Filho,Solismar de Paiva; Feigl,Brigitte Josefine; Piccolo,Marisa de Cássia; Fante Jr.,Lorival; Siqueira Neto,Marcos; Cerri,Carlos Clemente.
Some root parameters such as distribution, length, diameter and dry matter are inherent to plant species. Roots can influence microbial population during vegetative cycle through the rhizodeposits and, after senescence, integrating the soil organic matter pool. Since they represent labile substrates, especially regarding nitrogen, they can determine the rate of nutrient availability to the next crop cultivated under no-tillage (NT). The root systems of two crop species: maize (Zea mays L.) cultivar Cargill 909 and soybean [Glycine max (L.) Merr.] cultivar Embrapa 59, were compared in the field, and their influence on spatial distribution of the microbial C and N in a clayey-textured Typic Hapludox cultivated for 22 years under NT, at Tibagi, State of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Root distribution; Maize; Soybean; Carbon; Nitrogen.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500011

Utilization and fate of phosphorus of different sources applied to cohesive soil of Amazonian periphery
Provedor de dados: 63
Autores: Coelho,Marta Jordana Arruda; Aguiar,Alana das Chagas Ferreira; Sena,Virley Gardeny Lima; Moura,Emanoel Gomes de.
ABSTRACT In the Amazonian region, P is often a primary factor limiting sustainable agrosystems. We compared the efficiencies of local aluminous phosphate (ALP) and single superphosphate (SSP) under a cover of leguminous residues to determine the fate of P sources in an Amazonian soil with hardsetting characteristics. The experiment followed a randomized block design with four replications and the following treatments: ALPU, i.e. ALP plus urea (U); ALPL, i.e., ALP plus leucaena (L); SSPU, i.e., SSP plus urea; SSPL, i.e., SSP plus leucaena; and BS, i.e., bare soil (without residues). To assess the residual values of the P sources, we used a sequence of crops consisting of maize, cowpea and cassava. Both ALP and SSP exhibited low P efficiency in BS. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P fractions; Hardsetting soil; Aluminous phosphate; Leguminous residues; Nitrogen.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300242

Cattle manure fertilization increases fig yield
Provedor de dados: 63
Autores: Leonel,Sarita; Tecchio,Marco Antonio.
Fertilization using organic compounds is complementary to chemical fertilization, being essential to integrated fruit production. Reports on fig tree (Ficus carica L.) organic fertilization and mineral nutrition are worldwide scarce, especially in Brazil. This experiment aimed to evaluate the effects of cattle manure fertilization on the yield and productivity of the fig tree 'Roxo de Valinhos' in Botucatu, São Paulo State, Brazil, during the 2002/03, 2003/04, 2004/05 and 2005/06 crop cycles. Plants aged one, two, three and four year olds received the following cattle manure treatments: control (no fertilizer), 25%, 50%, 75%, 100%, 125% and 150% of the recommended N level for this crop. The evaluated variables were: fruit number, weight and mean diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L.; Nitrogen; Organic matter.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600013

Effects of irrigation and nitrogen levels on qualitative and nutritional aspects of fig-trees (Ficus carica L.)
Provedor de dados: 63
Autores: Hernandez,F.B.T.; Modesto,J.C.; Suzuki,M.A.; Corrêa,L.S.; Reichardt,K.
In order to evaluate qualitative and nutritional aspects of fig-trees with respect to six irrigation and six nitrogen levels, at Ilha Solteira, SP, Brazil, an experiment was carried out in randomized blocks, with subdivided plots, and four replications. Results showed that in four dates during harvest, only the first analysis (January 2, 1991) showed influence of nitrogen fertilization on fruit soluble solids (brix). There was no significant effect of treatments on pulp/peel relation for the four harvestings. In relation to leaf macronutrient concentration at flowering, water supply influenced N, P and Ca concentrations, and nitrogen influenced only Ca concentration. For an average of 10 t.ha-1 of mature fruit and 1.3 t.ha-1 of immature fruit production,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fig-trees; Irrigation; Nitrogen.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200015

Temperature influences swine wastewater treatment by aquatic plants
Provedor de dados: 63
Autores: Weirich,Carlos Eduardo; Feiden,Aldi; Souza,Camila Silveira; Marchetti,Clarice Rossato; Aleixo,Valdemir; Klosowski,Élcio Silvério.
ABSTRACT Studies show that aquatic plants are an efficient alternative to minimize the harmful effects of wastewater. Two species of aquatic macrophytes (Pistia stratiotes and Eichhornia crassipes) were chosen to evaluate the temperature effect on the performance of these macrophytes species in a post-treatment system of swine wastewater. The experiment was carried out in the municipality of Toledo, Paraná State, Brazil. For the experimental system, 24 concrete tanks with 80 L capacity were used, each measuring approximately 1.5 m in length, 0.25 m in width and 0.16 m deep. Wastewater characteristics and variables hydrogen potential (pH), electrical conductivity (EC), and dissolved oxygen (DO) were measured weekly. After, we analyzed the aquatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pistia stratiotes; Eichhornia crassipes; Nitrogen; Phosphorus; Macrophytes.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400103

ระดับของคาร์โบไฮเดรทและไนโตรเจนในช่วงการเกิดรากของกิ่งตัดชำ กีวีพันธุ์ Bruno
Provedor de dados: 106
Autores: Thawatchai Chinnawong.
Thesis (M.Sc. in Agriculture)
Tipo: PhysicalObject
Palavras-chave: Kiwi; Actinidia chinensis Planch.; Bruno; Stem cuttings; Carbohydrate; Nitrogen; Chemical analysis; Root formation; กีวี; พันธุ์บรูโน; กิ่งตัดชำ; คาร์โบไฮเดรท; ไนโตรเจน; การวิเคราะห์ทางเคมี; การเกิดราก.
Ano: 1981
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5517

ผลของไนโตรเจนและซัลเฟอร์ต่อปริมาณอัลลิซิน ในกระเทียม (Allium sativum L.)
Provedor de dados: 106
Autores: Pitsanu Sukkaew; Arak Tira-umphon.
Allicin is the most important secondary metabolite in garlic. It can inhibit the growth of various microorganisms, reduce plasma cholesterol, blood pressure, antiflamatory and reduce platelet aggregation. Plant nutrient is an important factor which affects the allicin content in garlic. In this, the research aimed to increase allicin content in garlic. Garlics were grown in growing bag containing substrate mixtures. They were fertilized with different nitrogen (N) and sulfur (S) concentrations and other nutrients. Three levels of N (180, 360 and 540 mg/l) and five levels of sulfur (25, 100, 175, 250 and 325 mg/l) were applied and treatments were arranged in Factorial combination in CRD, with four replications and two subsamples per replication. N and S...
Tipo: PhysicalObject
Palavras-chave: Garlic; Allium sativum; Allicin content; Sulfur; Nitrogen; Plant nutrition; Plant physiology; Chemical composition; กระเทียม; อัลลิซิน; การให้ธาตุอาหาร; ธาตุอาหารพืช; ซัลเฟอร์; ไนโตรเจน; ความเข้มข้นของธาตุอาหาร; การตอบสนองของพืช; การสังเคราะห์ส่วนประกอบทางเคมี.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5791

Effect of nitrogen rates on plant growth, seed yield and seed quality of three lines of Brachiaria hybrid grass
Provedor de dados: 106
Autores: Charouvanh Bouathong; Michael Hare; Manas Losirikul; Kitti Wongpichet.
Improved grasses planted for forage are increasing in demand throughout Thailand due to the increasingnumber of cattle. New varieties are being introduced in response to new demands. Brachiaria grasses, especially the hybrids, are gaining popularity because of their good yields and high quality. However, seed production of the brachiaria hybrids is difficult. The objectives of this experiment were to find out the appropriate rate (0, 20, 40, or80 kg/ha N) of N fertilizer (46-0-0) for growth, seed yield and quality of three lines of brachiaria hybrid (Mulato II,BR02/1752, and BR02/1794). This experiment composed of a field trial and laboratory tests and all were conducted at the Faculty of Agriculture, Ubon Ratchathani University, Thailand from May 2009 to...
Tipo: Collection
Palavras-chave: Brachiaria hybrid grass; Nitrogen; Plant growth; Seed yield; Seed quality; ฺBreaking; หญ้ารูซี่; อัตราไนโตรเจน; ผลผลิตเมล็ดพันธุ์; คุณภาพเมล็ดพันธุ์; อัตราการเจริญเติบโต; สายพันธุ์; การทำลายการพักตัวของเมล็ด.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5159

การเปลี่ยนแปลงความเข้มข้นของธาตุอาหารในใบพลับพันธุ์ ฟูยุ และ P2 ในรอบปี
Provedor de dados: 106
Autores: Jatupong Fujarern.
Thesis (M.Sc. in Agriculture)
Tipo: PhysicalObject
Palavras-chave: Persimmon leaf; Diospyros; Fuyu variety; P2 variety; Nutrient concentrations; Leaf analysis; Plant nutrition; Nitrogen; Phosphorus; Potassium; Calcium; Boron; Chiangmai province; Thailand; ใบพลับ; พันธุ์ฟูยุ; พันธุ์พีสอง; ธาตุอาหารพืช; การวิเคราะห์ระดับธาตุอาหาร; ระดับความเข้มข้น; ไนโตรเจน; ฟอสฟอรัส; โพแทสเซียม; แคลเซียม; โบรอน; จ.เชียงใหม่; ประเทศไทย.
Ano: 2009
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5504

Soil chemical attributes in a high biodiversity silvopastoral system
Provedor de dados: 109
Autores: Zin Battisti,Luiz Fernando; Schmitt Filho,Abdon Luiz; Loss,Arcángelo; Sinisgalli,Paulo Antonio de Almeida.
Abstract The use of conservation managements such as the silvopastoral system, and the Voisin rational grazing system have been excellent alternatives to increase animal welfare and production efficiency and improve soil chemical attributes of degraded pastures. Therefore, the objective of this work was to evaluatethe effect of a High Biodiversity Silvopastoral System (SPSNUCLEUS) on the soil chemical attributes through comparisons with soils of a Intensive Grazing Management without trees (IGM), primary forest, and secondary forest areas. Total organic carbon, total nitrogen, pH, Al, H+Al, Ca, Mg, K, and P were evaluated after four years of implementation of SPSNUCLEUS. Soil samples from the layers 0-5, 5-10, 10-20, 20-30, and 30-40 cm were collected in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Nitrogen; Tree component; Voisin rational grazing; Soil fertility.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400486

Genotype selection and addition of fertilizer increases grain yield in upland rice in Suriname
Provedor de dados: 36
Autores: NASCENTE,Adriano Stephan; KROMOCARDI,Ruby.
ABSTRACT The upland rice farmers in Suriname use local varieties and low level technologies in the field. As a result, the upland rice grain yield is low, at about 1 000 kg ha-1. Our objective was to evaluate the use of upland rice cultivars from Suriname and Brazil, and the effect of nitrogen, N, phosphorus, P, and potassium, K, fertilizers on cultivation variables. We undertook four field trials in the Victoria Area, in the Brokopondo District, using a randomized block design each with four replications. The most productive rice varieties were BRS Esmeralda (grain yield 2 903 kg ha-1) and BRS Sertaneja (2 802 kg ha-1). The highest grain yield of 2 620 kg ha-1 was achieved with a top dressing application of 76.41 kg N ha-1 20 days after sowing. For P, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Rice varieties; Nitrogen; Phosphorus; Potassium.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300185

ACUTE EXPOSITION OF COMMON SNOOK JUVENILES TO SUBLETHAL LEVELS OF NITRATE
Provedor de dados: 37
Autores: PEDROTTI,Fabiola; MAGNOTTI,Caio; STERZELECKI,Fabio; CERQUEIRA,Vinicius.
ABSTRACT The present study aimed to evaluate nitrate acute toxicity in cultured common snook Centropomus undecimalis juveniles. Fish (20.35±6.10 g and 13.90±1.75 cm) were submitted to a control treatment (without nitrate addition) plus 20 increasing concentrations of nitrate up to 2735 mg L-1 obtained by sodium nitrate. System was semi-static, with 100 % daily water renewed and sodium nitrate addition to maintain the respective concentrations. Water temperature was 20.99±0.55 °C, dissolved oxygen 6.79±0.21 mg L-1, pH 8.23±0.10, alkalinity 141.80±7.68 mg L-1 CaCO3, salinity 33.47±3.75 g L-1, total ammonia and nitrite less than 1 mg L-1. During experimental period (96 h), no mortalities were observed in fish with or without nitrate addition. Compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centropomidae; Marine fish; Nitrogen.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2018000300304

AMMONIA TOXICITY AFFECTS CATIONS UPTAKE AND GROWTH IN PAPAYA PLANTS INCLUSIVE WITH SILICON ADDITION
Provedor de dados: 37
Autores: SANTOS SILVA,Bruna; MELLO PRADO,Renato de; CALERO HURTADO,Alexander; APARECIDA DE ANDRADE,Renata; PEREIRA DA SILVA,Gilmara.
ABSTRACT High ammonia (NH4 +) concentration can exert stress on many plants, which causes nutritional disorders and reduction on plant growth. However, depending on the intensity of the stress, it may be attenuated by silicon. In this work, the response of impact of cations and silicon accumulations and plant growth in cultivated papaya plants was investigated under different toxic ammonia concentrations regardless of the presence of silicon (Si). The experiment was conducted at the Universidade Estadual Paulista (UNESP) with papaya seedlings, variety 'Grupo Formosa' (Calimosa híbrida 01), grown in a glass greenhouse, in 1.7 dm3 pots filled with pine and coconut fiber-based substrate. The experimental design was a randomized block design, in a 5 x 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Biomass; Phytotoxicity; Nitrogen; Nutrients.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000300345

Relation between chemical composition of Grateloupia doryphora (Montagne) Howe, Gymnogongrus griffithsiae (Turner) Martius, and abiotic parameters
Provedor de dados: 39
Autores: Perfeto,Paulo Nelo Medeiros.
In Grateloupia doryphora and Gymnogongrus griffithsiae the seasonal variation of their chemical compounds was studied, establishing a relation with the physical and chemical properties of seawater. High values of proteins in the studied species were detected during the winter, 28.88% in G. doryphora and 26.68% in G. griffithsiae, corresponding to the maximum period of ammonium concentration in the marine environment. The variation in carbohydrates content showed an inverse relation with the proteins, with a maximum of 54.72% in G. doryphora and of 55.36% in G. griffithsiae, both in summer, positively correlated with salinity and temperature of sea water. Lipids content was low in both species. In G. doryphora the values ranged between 0.81 and 1.30% and,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Proteins; Carbohidrates; Lipids; Ashes; Nitrogen; Phosphorus; Potassium.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061998000100006

Soil and leaf nutrient content of tree species support deciduous forests on limestone outcrops as a eutrophic ecosystem
Provedor de dados: 39
Autores: Rossatto,Davi Rodrigo; Carvalho,Fabrício Alvim; Haridasan,Mundayatan.
The leaf and soil nutrient status of plants has been used to infer structural and functional aspects at the ecosystem level. Such data are available for tropical and savanna systems growing on poor and acidic soils; however, information for species growing on eutrophic and basic soils is lacking. Deciduous tropical forest is one of the most endangered types of tropical forest, and despite the high level of attention aimed at it, little is known about the nutritional composition of its leaves. Here, we provided information on leaf nutrient content ratios and relationships for deciduous tree species growing on a limestone outcrop in Central Brazil. We compared our data on soil and leaf macronutrient concentration with previously published data from savannas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium; Deciduous forest; Leaf nutrient; Limestone outcrops; Nitrogen.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200231

Manejo da adubação nitrogenada e influência no crescimento da aveia preta e na produtividade do milho em plantio direto - DOI: 10.4025/actasciagron.v31i2.740
Provedor de dados: 1
Autores: Silva, Maria Anita Gonçalves da; UEM; Porto, Simone Maria Altoé; UEM; Mannigel, Anny Rosi; UEM; Muniz, Antonio Saraiva; UEM; Mata, José de Deus Viana da; UEM; Marchetti, Marlene Estevão; UEM.
A aveia preta é responsiva à adubação nitrogenada, a qual propicia aumento de biomassa e acúmulo de N, o qual poderá ser aproveitado pelo milho em sucessão. O trabalho foi realizado em Campo Mourão, Estado do Paraná, e teve como objetivo avaliar a resposta da aveia à adubação nitrogenada e a produtividade do milho cultivado em sucessão. Os tratamentos consistiram na aplicação de nitrogênio (120 kg há-1), tendo como fonte o sulfato de amônio, como a seguir: T1: (24-90-30); T2 (0-90-30); T3 (144-0-0); T4: (0-0-0), onde a adubação foi feita respectivamente na semeadura da aveia preta (SA), em pré-semeadura do milho, na aveia dessecada (PS) e na semeadura do milho (SM). No tratamento 1, a aveia recebeu somente a adubação nitrogenada na semeadura (24 kg há-1) e...
Palavras-chave: 5.01.00.00-9 Agronomia rotação de cultura; Nitrogênio; Zea mays crop rotation; Nitrogen; Zea mays.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/740

Export of N, P and K in barley subjected to fertilizer doses formulated with and without humic substance at sowing
Provedor de dados: 1
Autores: Oliveira, Kathia Szeuczuk de; Mendes, Marcelo Cruz; Ilibrante, Gustavo Arruda; Antoniazzi, Noemir; Stadler, Alan Junior; Antoniazzi, Ana Paula.
The aim of this study was to evaluate the effect of nitrogen fertilization with and without humic acid in barley cultivars on the export of nitrogen, phosphorus and potassium grains. The experiment was performed in the city of Guarapuava, PR, during the 2015 and 2016 growing seasons. The experimental design was in RCB in factorial 5 x 2, with the following sowing fertilization (kg ha-1): 0, 100 NPK, 100 NPK+HS, 250 NPK, 250 NPK+HS and two cultivars, BRS Brau and BRS Elis. The dose of 250 kg NPK with humic substance increased the nitrogen export to barley grains, with the highest levels occurring in the BRS Brau cultivar under favorable climatic conditions. Under favorable climatic conditions, the export of phosphorus to barley grains in the agricultural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hordeum vulgare; NPK fertilizer; Nitrogen; Phosphorus; Potassium.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42690

Resposta da aveia preta (Avena strigosa schreb) à irrigação por aspersão e adubação nitrogenada - DOI: 10.4025/actasciagron.v30i3.3555
Provedor de dados: 1
Autores: Luz, Pedro henrique Cerqueira; USP; Herling, Valdo Rodrigues; USP; Braga, Gustavo José; APTA; Nogueira Filho, José Carlos Machado; USP; Faria, Letícia de Abreu; USP; Lima, César Gonçalves de; USP.
O objetivo do estudo foi avaliar os efeitos da adubação nitrogenada e da irrigação por aspersão no crescimento e na produção de massa seca (MS) da aveia preta (Avena strigosa, Schreb). Foram avaliadas quatro doses de nitrogênio (0, 50, 100 e 150 kg de N ha-1) e também a presença ou ausência de irrigação. Foram determinadas as seguintes variáveis: altura de planta, produção de massa seca, taxa de crescimento e o teor de MS. Quando irrigada, a altura da planta foi maior, refletindo maior produção de massa seca. Na área de sequeiro, o teor de MS foi superior (24,7%) ao da área irrigada (18,7%). Quanto à adubação nitrogenada, houve resposta somente para altura de planta, com comportamento linear, quando da utilização de irrigação. Os efeitos da irrigação foram...
Palavras-chave: 5.01.00.00-9 Agronomia altura de planta; Nitrogênio; Produção de massa seca 5.01.03.00-8 Fitotecnia height of plant; Nitrogen; Dry matter yield.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3555

Metabolism of carbohydrates in Estilosantes cv. Campo Grande under different systems of cultivation and nitrogen fertilization
Provedor de dados: 1
Autores: Coura, Florence Taciana Veriato; Fries, Daniela Deitos; Dias, Daniel Lucas Santos; Souza, Renata Rodrigues Jardim; Santos, Adriane Pereira da Silva dos; Paiva, Leliane Santos.
The objective of this study was to verify the activity of invertases in Estilosantes under the influence of cultivation systems and nitrogen fertilization in two seasons. The experiment was conducted in the Xaraés area, where Estilosantes was planted according to a 2 x 2 factorial scheme with two cultivation systems (monoculture and mixed pasture) in the absence or presence of fertilization (75 kg of N ha-1). A randomized block design with four replications was used. The neutral cytosol (Inv-N), vacuole acid (Inv-V) and cell wall acid (Inv-CW) invertase activity and reducing sugar contents in the leaves and stems were evaluated and analyzed by a 5% probability F-test. The interaction between cultivation systems and nitrogen fertilization was significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrates; Legumes; Mixed pasture; Nitrogen; Photoassimilates.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42711

Soil carbon accumulation in cotton production systems in the Brazilian Cerrado
Provedor de dados: 1
Autores: Ferreira, Alexandre Cunha de Barcellos; Borin, Ana Luiza Dias Coelho; Lamas, Fernando Mendes; Bogiani, Julio Cesar; Silva, Mellissa Ananias Soler da; Silva Filho, Joao Luis da; Staut, Luiz Alberto.
Sustainable production systems, such as the no-tillage system (NTS), have a tendency to increase organic carbon in the soil. However, in Brazilian cotton production, the conventional tillage system (CTS) is predominant, and long-term studies on cotton crop under the NTS are scarce. The present study aimed to evaluate the effect of soil management and crop rotation systems on the cotton fiber yield as well as on the carbon and nitrogen accumulation in the soil. This study was conducted in the Brazilian savanna over 9 years and consisted of the following four treatments with different soil management systems: the NTS and CTS with the succession or rotation of crops (cotton, soybean, maize, and Urochloa ruziziensis). The NTS increased the carbon content by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; No-tillage; Conventional tillage; Nitrogen; Carbon stock; 5.01.01.06-4.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/43039

Resposta da alface à adubação nitrogenada com diferentes compostos orgânicos em dois ciclos sucessivos - DOI: 10.4025/actasciagron.v32i1.1340
Provedor de dados: 1
Autores: Silva, Francisca Alcivania de Melo; UNESP; Villas Boas, Roberto Lyra; UNESP; Silva, Reginaldo Barboza; UNESP.
Os objetivos deste trabalho foram avaliar a produção de alface em ambiente protegido, utilizando diferentes compostos orgânicos como fonte de nitrogênio, e seu efeito residual em dois ciclos sucessivos. O experimento foi conduzido entre os meses de fevereiro e maio de 2005, em casa-de-vegetação com ventilação e temperatura controlados, utilizando vasos de 3,5 L e solo classificado como Latossolo Vermelho Escuro. Foram utilizados compostos orgânicos produzidos a partir da mistura de resíduos do processamento de quatro plantas medicinais e esterco bovino. Os compostos C1, C2, C3 e C4 nas doses 30, 60, 90 e 120 t há-1 constituíram os tratamentos dispostos em delineamento inteiramente casualizado, com quatro repetições e uma testemunha (adicional). Foram...
Palavras-chave: 5.01.00.00-9    Agronomia Lactuca sativa L.; Adubação orgânica; Nitrogênio; Efeito residual 5.01.01.05-6 Fertilidade do Solo e Adubação Lactuca sativa L.; Organic fertilization; Nitrogen; Residual effect.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1340

Nitrate leaching from a Latosol after application of liquid swine manures in different pH values and organic matter contents - doi: 10.4025/actasciagron.v32i4.10070
Provedor de dados: 1
Autores: Costa, Antonio Carlos Saraiva Da; Universidade Estadual de Maringá; Seidel, Edleusa Pereira; Universidade Estadual do Oeste do Paraná.
Liquid swine manures are produced in large volumes in the western Paraná and Santa Catarina states and are reused as a source of nutrients. This study aimed to evaluate the losses of nitrate (N-NO3-1) after application of liquid swine manures in three samples of a Latosol (Rhodic Eutrudox) with different levels of soil organic matter and pH collected at different depths. The experimental design was completely randomized with one soil, three levels of soil organic matter (34.09, 22.36 and 8.6 g dm-3), four pH in CaCl2 (4.0, 5.0, 6.0 and 7.0) conditions and three replications. Each experimental unit contained 450 cm3 of soil that received a dose of liquid swine manures equivalent to 120,000 dm-3 ha-1. The concentration of N-NO3-1 was evaluated in the...
Tipo: Pesquisa científica de laboratório
Palavras-chave: 5.01.01.00-5 animal wastes; Anion exchange capacity; Nitrogen; Swine manure 5.01.01.03-0 animal wastes; Anion exchange capacity; Nitrogen; Swine manure.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/10070

Components of corn crop yield under inoculation with Azospirillum brasilense using integrated crop-livestock system
Provedor de dados: 1
Autores: Brum, Marcos da Silva; Cunha, Vinícius Dos Santos; Stecca, Jéssica Deolinda Leivas; Grando, Luiz Fernando Teleken; Martin, Thomas Newton.
The objective of this study was to evaluate the agronomic characteristics of corn seed inoculated with Azospirillum brasilense, grown on black oat and ryegrass straw, and managed under different grazing strategies and doses of nitrogen. The experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, during two agricultural seasons (2012/2013 and 2013/2014) in a randomized, complete block design with three replications. In the winter period, black oat and ryegrass straw were managed at different grazing heights by sheep (0.30, 0.20, 0.10 m, conventional grazing, and no grazing) with three doses of nitrogen (0, 50, and 100 kg ha-1, with or without inoculation by A. brasilense). We used the hybrid Pioneer (P1630H®) in 2012 and the hybrid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.00.00-9 Zea mays; Grazing heights; Biological nitrogen fixation; Nitrogen; Integrated systems. Fitotecnia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30664

Export of N, P and K in barley subjected to fertilizer doses formulated with and without humic substance at sowing
Provedor de dados: 1
Autores: Oliveira, Kathia Szeuczuk de; Mendes, Marcelo Cruz; Ilibrante, Gustavo Arruda; Antoniazzi, Noemir; Stadler, Alan Junior; Antoniazzi, Ana Paula.
The aim of this study was to evaluate the effect of nitrogen fertilization with and without humic acid in barley cultivars on the export of nitrogen, phosphorus and potassium grains. The experiment was performed in the city of Guarapuava, PR, during the 2015 and 2016 growing seasons. The experimental design was in RCB in factorial 5 x 2, with the following sowing fertilization (kg ha-1): 0, 100 NPK, 100 NPK+HS, 250 NPK, 250 NPK+HS and two cultivars, BRS Brau and BRS Elis. The dose of 250 kg NPK with humic substance increased the nitrogen export to barley grains, with the highest levels occurring in the BRS Brau cultivar under favorable climatic conditions. Under favorable climatic conditions, the export of phosphorus to barley grains in the agricultural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hordeum vulgare; NPK fertilizer; Nitrogen; Phosphorus; Potassium.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42690

Consumo hídrico e coeficiente de cultura para o híbrido DKB 390 - DOI: 10.4025/actasciagron.v31i3.379
Provedor de dados: 1
Autores: Detomini, Euro Roberto; USP; Massignan, Luiz Fernando Druzina; USP; Libardi, Paulo Leonel; USP; Dourado Neto, Durval; USP.
O objetivo deste trabalho é caracterizar o consumo hídrico do genótipo DKB 390 em condições adequadas de irrigação, tanto para situações de suprimento suficiente quanto para subótimo de nitrogênio. Valores de coeficiente de cultura são também apresentados para diferentes fases, para o primeiro caso, no intuito de prover subsídios teóricos para orçamento de água à cultura e para o manejo da irrigação durante o ciclo. Um experimento de campo foi conduzido durante a estação principal de cultivo, avaliando-se biomassa, área foliar, umidade do solo, dados climatológicos e transmitância de luz, permitindo derivar o balanço hídrico, o consumo hídrico e a eficiência de uso da água. O genótipo mencionado requer por volta de 600 mm para a obtenção de elevadas...
Palavras-chave: 5.01.00.00-9    Agronomia Zea mays; Evapotranspiração; Nitrogênio; Biomassa; KC; Milho Zea mays; Evapotranspiration; Nitrogen; Biomass; Kc; Maize.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/379

Effects of row spacing and nitrogen topdressing fertilization on the yield of upland rice in a no-tillage system
Provedor de dados: 1
Autores: Lacerda, Mábio Chrisley; Nascente, Adriano Stephan.
This study aimed to evaluate the effect of row spacing and nitrogen topdressing fertilization of two materials (genotype 07SEQCL441 CL and cultivar BRS Esmeralda) on the plant height, yield components, grain yield, and quality of an upland rice crop grown in a no-tillage system. Trials were conducted for two growing seasons under field conditions in a 3 x 4 factorial, randomized, complete block design, with four replications. For each material, treatments consisted of the combination of row spacing (0.225, 0.35, and 0.45 m) with nitrogen (N) applied as topdressing (0, 50, 100, and 150 kg ha-1). The lowest row spacing (0.225 m) for genotypes 07SEQCL441 CL and BRS Esmeralda provided a higher number of tillers, number of panicles m-2, and grain yield of rice....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agronomia; Fitotecnia; Cultivares Oryza sativa L.; Nitrogen; Plant population; NTS; Cerrado fitotecnia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30855

Ryegrass (Lolium multiflorum) BRS Ponteio and wheat (Triticum aestivum) BRS Tarumã pasture with different doses of ammonium sulfate as topdressing
Provedor de dados: 2
Autores: Timm, Luiz Carlos; Haygert-Velho, Ione Maria Pereira; Bolke, Delvacir Rezende; Antunes, Gustavo Veiverberg; Alessio, Dileta Regina Moro; Velho, João Pedro.
This study analyzed the behavior of the annual ryegrass (Lolium multiflorum) BRS Ponteio and dual-purpose wheat (Triticum aestivum) BRS Tarumã with different doses of ammonium sulfate as topdressing and evaluated the exponential growth model to explain the physiological development of both species. For each species, a completely randomized design was used with four replications per treatment with 9m2 area, in which the following treatments were distributed: 0, 150, 250, 350 and 450 kg nitrogen per hectare applied as ammonium sulfate. The cumulative and adjusted productions to the exponential growth model at the end of the cycle were, respectively: BRS Ponteio 150 = 5,620; 250 = 5,920; 350 = 7,585 and 450 = 8,491 and BRS Tarumã 150 = 3,922; 250 = 5,060; 350...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Agrárias; Zootecnia; Pastagem e Forragicultura degree-days; Lolium multiflorum; Dry matter; Exponential model; Nitrogen; Triticum aestivum.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/44026

Glutamic acid supplementation on low protein diets for laying hens
Provedor de dados: 2
Autores: Bezerra, Roseane Madeira; Costa, Fernando Guilherme Perazzo; Givisiez, Patrícia Emília Naves; Goulart, Cláudia Castro; Santos, Renato Andrade dos; Lima, Matheus Ramalho.
With the objective of evaluating the effect of reducing crude protein (CP) and L-glutamic acid supplementation, Dekalb Brown laying hens with 34 weeks of age. The birds were distributed in six treatments in a completely randomized design, eight replications of eight birds. The control diet contained 17% CP. The second and third treatments had CP reduced by 1.5 and 3.0 percentage points (pp) of CP in relation to the control diet, respectively. In the fourth treatment, was added the same amount of glutamate of the control diet (2.982%), and the last two treatments was added 1 and 2 pp of glutamate in relation to control diet (3.982 and 4.98%), respectively. The treatment with 15.17% CP + 0.341% L-glutamic acid (T4) promoted higher egg production, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.00.00-2 egg production; Nitrogen; Performance; Uric acid.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/25911

Produção e composição química da Brachiaria brizantha cv. MG-4 sob efeito de adubação com NPK - doi: 10.4025/actascianimsci.v33i2.9392
Provedor de dados: 2
Autores: Teles, Thaisa Grazielle Radin Magalhães; Unidade de Ensino Superior Vale do Iguaçu; Carneiro, Maria Socorro de Souza; Universidade Federal do Ceará; Soares, Ismail; Universidade Federal do Ceará; Pereira, Elzania Sales; Universidade Federal do Ceará; Souza, Pedro Zione de; Universidade Federal do Ceará; Magalhães, João Avelar; Embrapa Meio-Norte.
O objetivo deste trabalho foi avaliar os efeitos de combinações de doses de nitrogênio, fósforo e potássio sobre a produção de matéria seca e composição química de Brachiaria brizantha cv. MG-4. O experimento foi composto por 16 tratamentos de NPK, conforme matriz experimental Plan Puebla II, distribuídos em delineamento inteiramente casualizado com cinco repetições. Utilizou-se um Argissolo Vermelho-Amarelo Distrófico Arênico e, como fonte de N, P e K, foram utilizados sulfato de amônio e uréia, superfosfato triplo e cloreto de potássio, respectivamente. O material coletado foi separado em colmo e folha, e pré-seco para a determinação da produção matéria seca de folhas (MSF), colmos (MSC) e total (MST), teor de proteína bruta (PB), N, P e K. A adubação...
Tipo: Pesquisa de campo
Palavras-chave: 5.04.00.00-2 Fósforo; Nitrogênio; Potássio; Proteína bruta 5.04.04.00-8 Phosphorus; Nitrogen; Potassium; Crude protein.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9392

Phytase in diets with crude protein levels for commercial layers
Provedor de dados: 2
Autores: Pereira, Adriana Aparecida; Junqueira, Otto Mack; Griep Junior, Dirceu Neutzling; Lima Júnior, Dorgival Morais de; Sgavioli, Sarah; Morais, Socorro.
 The aim of this study was to evaluate the action of the phytase enzyme in diets formulated with variations in the crude protein content on performance and egg quality of commercial layers. A total of 336 commercial layers were housed at eight birds per cage in a 3 × 2 factorial arrangement with seven replicates. Treatments consisted of four crude-protein levels (17, 15, and 13%) and two enzyme levels (0 and 500 FTU kg-1 diet), distributed in a completely randomized design. Feed intake, egg production, feed conversion per dozen eggs and per kilogram, egg weight and mass, specific gravity, eggshell thickness, and Haugh unit were measured over five 28-day periods. The performance of commercial layers fed the diet containing 13% crude protein worsened,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus; Chicken; Nitrogen; Eggs.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33097

Chemical composition and crude protein fractions of Coastcross grass under grazing on winter, spring and summer in Southern Brazil - doi: 10.4025/actascianimsci.v34i2.10895
Provedor de dados: 2
Autores: Branco, Antonio Ferriani; Universidade Estadual de Maringá; Viana, Keila Bianchin; Universidade Estadual de Maringá; Castañeda, Román David; Universidade Estadual de Maringá; Prohmann, Paulo Emilio; Universidade Estadual de Maringá; Coneglian, Sabrina Marcantonio; Universidade Estadual de Maringá; Mouro, Gisele Fernanda; Universidade Estadual de Maringá.
The objective of this study work was to assess crude protein fractions in structural components (leaves, stem and dead material) of Coastcross grass (Cynodon dactylon (L.) Pers) under grazing, on winter, spring and summer seasons, in the Northwestern of Paraná, South of Brazil. Were determined CP, NDF, ADF contents and protein fractions, A, B1, B2, B3 and C. The analysis of CP showed great differences among months, but there was no difference among seasons. NDF and ADF in the stem were lower (p &amp;lt; 0.05) during the spring. The season did not affect (p &amp;gt; 0.05) protein fractions A, B1, B2, B3 and C of leaves. However, it was observed that the highest proportions of CP were B3 and A fractions. For the stem, the most important crude protein...
Tipo: Pesquisa de campo ; análise laboratorial
Palavras-chave: 5.04.00.00-2 e 5.04.03.00-1 seasons; Nitrogen; Ruminants; CNCPS.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10895

Mass balance of nutrients during the filling phase of two reservoirs of Sistema Produtor Alto Tietê (SPAT) - doi: 10.4025/actascibiolsci.v33i1.7313
Provedor de dados: 3
Autores: Cope, Valéria; Instituto de Pesca - APTA - SAA - SP; Mercante, Cacilda Thais Janson; Instituto de Pesca - APTA - SAA - SP; Carmo, Clovis Ferreira do; Instituto de Pesca - APTA - SAA - SP; Sendacz, Suzana; Instituto de Pesca - APTA - SAA - SP; Monteiro Junior, Adalberto José; Instituto de Pesca - APTA - SAA - SP.
Paraitinga and Biritiba reservoirs are part of Sistema Produtor Alto Tietê and they play an important role at the public water supply. The purpose of this study is to understand the mass balance of nitrogen and phosphorus that can influence the eutrophication process in reservoirs during the filling phase, and provide information for the implementation of mechanisms to manage water quality. Water samples were collected from August 2005 until May 2006. Concentrations of total phosphorus (PT) and total nitrogen (NT) were measured and the mass balance and loads were estimated. Paraitinga reservoir presented retention of NT and PT during the dry season and export during the rainy season; whilst at Biritiba reservoir we evidenced retention of NT and PT for both...
Tipo: Balanço de massa
Palavras-chave: 2.05.02.00-1 water supply; Nitrogen; Phosphorus Ecologia de Ecossistemas water supply; Nitrogen; Phosphorus.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7313

Preliminary analysis on the use of Trophic State Indexes in a brazilian semiarid reservoir
Provedor de dados: 3
Autores: Lima, Paulo de Freitas; Sousa, Mart Som Reis; Porfírio, André Ferreira; Almeida, Beatriz Soares; Freire, Rogério Herlon Furtado; Santaella, Sandra Tédde.
The Carlson’s (1977) Trophic State Index (TSI) is a widely employed tool to estimate the degree of eutrophication in a reservoir. In Brazil, the need of a classification system that would take into account regional characteristics employed adjusted indexes generated by data from reservoirs in the southeastern region of the country. Current research compares responses for Carlson’s TSI (1977) and its derivations for Brazilian reservoirs from data collected in the Pereira de Miranda Reservoir (State of Ceará, Brazil), and analyzes the influence of local conditions on results and their applicability to reservoirs in the semiarid region. TSIs were calculated by data on total phosphorus, chlorophyll a and water transparency. The reservoir was estimated as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências biológicas; Ecologia (2.05.00.00-9) hydro-climatic conditions; Eutrophication; Limiting nutrient; Phosphorus; Nitrogen; Chlorophyll a Ecologia de ecossistemas (2.05.02.00-1).
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/27160

Interaction effect between mineral zinc-nitrogen fertilization mixture and organic fertilization as compost on yield, nutrients uptake of rice and some soil properties
Provedor de dados: 111
Autores: Mosaad, Ibrahim S; Khafagy, El-Hosiny E; Seada, Ali K.
To study the effect of organic fertilization as compost (20 m3 fed-1), mineral Zinc-Nitrogen fertilization mixture (three Zinc levels (0, 8 and 16 kg Zn fed-1) and three nitrogen rates (0, 30 and 60 kg N fed-1 were mixed alternately) on growth, grain and straw yields, N, P and K uptake for rice crop (Oryza sativa), variety Giza 178, two field trials at El-Serw Agricultural Research Station, Damietta governorate were conducted through summer seasons of 2015 and 2016. Plant height, dry matter, grain and straw yields also, N, P and K-uptake in grain and straw yields increased with increasing levels of zinc and nitrogen fertilization. Moreover, use organic fertilization as compost gave the highest values of the previous parameters. Applying of 16 kg Zn fed-1 +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice; Zinc; Compost; Organic matter; Uptake; Nitrogen; Fertilization.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4647

The relationship between the wood properties and decay levels of Pecan logs
Provedor de dados: 111
Autores: Zhang, Peiyao; Riskowski, Gereald.
The objective of this research was to find a solution for how to define and determine the decay levels of Pecan logs. Ultimately this information could be used to determine the preferred decay level of Pecan logs for Auricularia auricular-judae (wood ear mushroom) growth.  Previous research had found some relationship between densities and C/N ratio of hardwood boreal trees in Canada. In this research, the physical (density, moisture content, penetration depth, etc.) and chemical properties (carbon, nitrogen and C/N ratio) of logs were measured from pecan logs at different levels of decomposition. First, the traditional visual method was used to define the decay level and they were compared to the log physical and chemical properties to find relationships...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auricularia auricula-judae; Pecan logs; Wood decay level; Carbon; Nitrogen.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5685

Selection of fertilization method and fertilizer application rate on corn yield
Provedor de dados: 111
Autores: Bakhtiari, Mohammad Reza.
Abstract: A field experiment was carried out on the silty clay soil of Lack-Lack agricultural research field during two years to select the most suitable fertilization method (fertilizer broadcasting, fertilizer pouring in the furrow, fertilizer banding placement in one side and both sides of seedling) and application rate (30, 60 and 90 kg of net nitrogen from source of urea fertilizer/ha) on corn yield and yield components in Hamedan province in Iran.  Corn yield components evaluated were plant height, corn height, percentage of corncob, thousand-kernel mass and net yield.  A factorial experiment with 12 treatments (four methods × three levels) was replicated three times in 36 test plots.  By analysis of variance and comparison of treatment means using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilization methods; Nitrogen; Fertilizer application rates; Corn; Placement fertilizer; Iran.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2700

Azospirillum lipoferum and nitrogen fertilization effect on chlorophyll content, nutrients uptake and biometric properties of Zea mays L.
Provedor de dados: 115
Autores: Davaran-Hagh,Elnaz; Mirshekari,Bahram; Reza-Ardakani,Mohammad; Farahvash,Farhad; Rejali,Farhad.
Integrated nutrient management is a major agronomic practice which brings together all methods to support plants nutritional requirement. However, the interaction of these methods together is very complex and needs to be studied in different climatic conditions. So, the effect of nitrogen fertilizer and Azospirillum lipoferum inoculation on maize (Zea mays L.) growth, yield and nutrients uptake was determined in this study. The hypothesis was that the bacterial inoculation decreases the need for N fertilizer application without reducing plant yield. Therefore, we carried out a factorial experiment in a randomized complete block design with three replications. Nitrogen at 0, 25, 50, 75 and 100 % concentrations of the recommended dose, i.e. 150 kg N ha-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizer; Iron; Nitrogen; Phosphorus; Zinc.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800006

Osmotic stress induced by polyethylene-glycol alters macronutrient concentrations in sugarcane (Saccharum spp.) plants in vitro
Provedor de dados: 115
Autores: Castañeda-Castro,Odón; Gómez-Merino,Fernando C.; Trejo-Téllez,Libia I.; Pastelín-Solano,Miriam C.
The potential capacity of plant roots to absorb water and nutrients generally declines in osmotic-stressed plants, presumably because of a reduction in the nutrient element demand, and such decrease varies among plant genotypes. In order to investigate the effect of the osmotic stress caused by polyethylene-glycol 6000 (PEG) on the macronutrient concentration in sugarcane (Saccharum spp.) in vitro, we established a factorial experiment with a completely randomized distribution. Study factors were variety (Mex 69-290 and CP 72-2086) and PEG in the nutrient medium (0, 3, 6 and 9 %, to generate osmotic potential corresponding to -0.18, -0.45, -0.65 and -0.80 MPa, respectively), which resulted in eight treatments, with five replicates each. The experimental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant nutrition; Poaceae; PEG; Nitrogen; Phosphorus; Potassium.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800004

Use of a mathematical model to estimate the impact of shrimp pen culture at Patos Lagoon estuary, Brazil
Provedor de dados: 42
Autores: POERSCH,LUÍS H.; MILACH,ÂNGELA M.; CAVALLI,RONALDO O.; WASIELESKY,WILSON JR.; MÖLLER,OSMAR; CASTELLO,JORGE P.
Ecological modeling has been used as a tool to estimate potential impacts caused by aquaculture to the surrounding environment. In this work, a mathematical model was applied to estimate the maximum amount of pink shrimp (Farfantepenaeus paulensis) culture units (3,100m2 pen enclosures) that could be installed at two shallow estuarine bays of Patos Lagoon (known as Coreia and Porto do Rei) with no significant effects on either water quality or viability of the culture system. To calibrate the model, information about the culture of Litopenaeus vannamei and F. paulensis as well as field data (influence of netting material, water current speed and nitrogen concentrations) were used. Under a bad scenario (water current velocity of 0.01m s–1 and a mesh...
Palavras-chave: Nitrogen; Pen shrimp culture; Sustainability; Ecological modeling; Coastal management.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301063

Nutrient and phytoplankton biomass in the Amazon River shelf waters
Provedor de dados: 42
Autores: Santos,Maria L.S.; Muniz,Kátia; Barros-Neto,Benício; Araujo,Moacyr.
The Amazon River estuary is notable at the Amazon Continental Shelf, where the presence of the large amount of water originating from the Amazon during the river's falling discharge period was made evident by the low salinity values and high nutrient levels. Even so, the presence of oceanic waters in the shelf area was significant. Dissolved organic nitrogen was the predominant species of the nitrogen cycle phases, followed by total particulate nitrogen, nitrate, ammonium and nitrite. The chlorophyll a data in the eutrophic area indicated that there is sufficient nitrogen in the area to withstand productivity, though dissolved inorganic nitrogen removal processes are faster than regeneration or mineralization. The anomalous amounts of inorganic dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Continental Shelf; Nitrogen; Phosphate; Mathematical modeling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400011

Quantification of ruminal microbiota and production of methane and carbonic dioxide from diets with inclusion of glycerin
Provedor de dados: 45
Autores: Santos,V.C.; Ezequiel,J.M.B.; Homem Junior,A.C.; Pinheiro,R.S.B.
The aim of this study was to quantify the liquid-associated bacteria and protozoa of the rumen and to evaluate the potential of in vitroproduction of gases CH4 and CO2 of diets with inclusion of glycerin for sheep. Two diets were formulated with a roughage:concentrate ratio of 20:80, according to the presence or absence of glycerin: G0 - control, without glycerin; and G10 - 10% glycerin as part of the concentrate. To quantify the liquid-associated bacteria and protozoa from the rumen and production of CH4 and CO2 gases, a completely randomized design was used. The diets had no effect (P&gt;0.05) on production and composition of liquid-associated protozoa and bacteria from the rumen of lambs. Likewise, a (P&gt;0.05) diet effect was not observed on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sheep; Bacteria; Gases; Nitrogen; Protozoa.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000100205

Sugarcane straw decomposition and carbon balance as a function of initial biomass and vinasse addition to soil surface
Provedor de dados: 53
Autores: Yamaguchi,Carina Sayuri; Ramos,Nilza Patrícia; Carvalho,Cristina Silva; Pires,Adriana Marlene Moreno; Andrade,Cristiano Alberto de.
ABSTRACT The objective of this study was to evaluate sugarcane straw decomposition and the potential of increasing soil carbon as a function of the initial biomass and vinasse addition to soil surface. The experimente consisted of incubation (240 days, in the dark, humidity equivalent to 70% of soil water retention capacity and average temperature of 28 °C) of Oxisol soil samples (0-20 cm soil layer) with straw added to soil surface at rates of 2; 4; 8; 16 and 24 t∙ha−1 and with or without vinasse addition (200 m3∙ha-1). The following variables were determined: released C-CO2, remaining straw dry matter, carbon straw and soil carbon concentration. The added biomass did not influence straw decomposition rate, but vinasse treatments provided rates between 70...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon mineralization; Nitrogen; Waste.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100135

Nitrogen fertilization in top dressing for wheat crop in succession to soybean under a no-till system
Provedor de dados: 53
Autores: Galetto,Shivelly Los; Bini,Angelo Rafael; Haliski,Adriano; Scharr,Danilo Augusto; Borszowskei,Paulo Rogério; Caires,Eduardo Fávero.
ABSTRACT Agricultural intensification to improve wheat yield has increased the demand for nitrogen fertilizers. This study aimed to investigate the wheat response in succession to soybean due to application of nitrogen rates and sources in top dressing, as well as to determine the N rates of maximum technical yield (MTY) and maximum economic yield (MEY). A field experiment was carried out in Ponta Grossa, Paraná State, Brazil, on a clayey Typic Hapludox (Oxisol) under a continuous no-till. A randomized block design was used, with 3 replications in a 4 × 3 complete factorial arrangement. The treatments consisted of a control and 3 N rates at 40; 80 and 120 kg∙ha−1 as calcium nitrate (CN), ammonium sulfate (AS), and urea (UR) in top dressing at tillering of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Nitrogen; Calcium nitrate; Ammonium sulfate; Urea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200282

Endophytic bacteria affect sugarcane physiology without changing plant growth
Provedor de dados: 53
Autores: Marcos,Fernanda Castro Correia; Iório,Raquel de Paula Freitas; Silveira,Adriana Parada Dias da; Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Lagôa,Ana Maria Magalhães de Andrade.
ABSTRACT The aim of this study was to evaluate if endophytic bacteria inoculants would be beneficial to the sugarcane varieties IACSP94-2094 and IACSP95-5000, promoting changes in photosynthesis and plant growth. The plants, obtained from mini stalks with one bud, were treated with two bacteria mixtures (inoculum I or II) or did not receive any inoculum (control plants). The inocula did not affect shoot and root dry matter accumulation as compared to the control condition (plants with native endophytic bacteria). However, photosynthesis and electron transport rate (ETR) increased in IACSP94-2094 treated with the inoculum II, whereas the inoculum I enhanced photosynthesis and stomatal conductance in IACSP95-5000. The inoculum II caused increase in leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Plant-bacteria interaction; Photosynthesis; Nitrogen; Mini stalks with one bud.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100001

Ammonium sulphate on maize crops under no tillage
Provedor de dados: 53
Autores: Silva,Maria Anita Gonçalves da; Mannigel,Anny Rosi; Muniz,Antonio Saraiva; Porto,Simone Maria Altoé; Marchetti,Marlene Estevão; Nolla,Antonio; Bertani,Rosemary Marques de Almeida.
The objectives of this work were to evaluate the management of N and S (as ammonium sulphate) fertilization under no-tillage system on the components of maize productivity and on N and S accumulation in the crop, as well as to evaluate the minimum value of the Nitrogen Sufficiency Index (NSI 0.95) as an indicator for side dressing requirements. The experiment had a completely randomized block design with six treatments and four replications carried out in Red Latosol dystrophic soil (Hapludox), in Campo Mourão, Paraná State, where the following treatments in summer growth maize were applied: T1- 120 kg ha-1 N in seeding; T2- 120 kg ha-1 N in side dressing; T3- 40 kg ha-1 N in seeding and 80 kg ha-1 N in side dressing; T4- 30 kg ha-1 N in seeding and 90 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Triticum aestivum; Fertilizer management; Nitrogen; Sulfur.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000100014

Effect of inoculation associated to leaf sprayed Co+Mo on the yield and grain nutrients in common bean (Phaseolus vulgaris L)
Provedor de dados: 52
Autores: Berton Junior,João Francisco; Santos,Julio Cesar Pires; Coelho,Cileide Maria Medeiros; Klauberg Filho,Osmar.
The objective of this work was to evaluate the efficiency of nitrogen fixing inoculum associated with Co + Mo leaf spray on the common bean grain yield and grain nutrients, cv. FT Nobre. Three dosages of the inoculant (0, 200 and 400 g/50 kg seeds), combined with four Co + Mo leaf spray levels (T0=0,0; T1=4.9,49; T2=7.3,73; and T3=9.7,97 g ha-1 of Co and Mo, respectively) were tested. The grain yield with the use of the inoculant (400 g / 5O kg seed-1) associated with the higher level of Co+Mo (T2 and T3) was very similar to the mineral nitrogen condition fertilizer recommended for the bean (70 kg ha-1 of N). With the increased inoculant dosage, an increase of the protein content and of P and Mg in the grain was also observed. The results indicated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed quality; Phosphorus; Magnesium; Nitrogen.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600002

Nitrogen forms, pH and total carbon in a soil incubated with treated sewage effluent
Provedor de dados: 52
Autores: Fonseca,Adriel Ferreira da; Herpin,Uwe; Dias,Carlos Tadeu dos Santos; Melfi,Adolpho José.
In this study, an experiment under controlled conditions was carried out to determine the effects of secondary-treated sewage effluent (STSE) application on soil nitrogen concentrations (mineral and total), total carbon and soil pH. The soil and STSE used were collected at Lins, São Paulo State, Brazil. A completely randomized design was used, in completed factorial 4x11 (weekly application rates of 0, 100, 150 and 200 mL STSE per kg soil; and, eleven soil incubation periods from 0 to 10 weeks) with four replicates. The STSE was applied simulating common surface irrigation. Seven days after each incubation period, ammonium and nitrate contents were determined. Additionally, pH and total carbon and nitrogen contents were measured in the soil after 10 weeks....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Treated sewage effluent; Nitrogen; Carbon; Tropical soil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000500001

Exchangeable basic cations and nitrogen distribution in soil as affected by crop residues and nitrogen
Provedor de dados: 52
Autores: Rosolem,Ciro Antonio.
In this work, a greenhouse experiment was conducted to study the effects of N fertilization and residues of pearl millet, black oats and oilseed radish on pH and Ca, Mg, K, NO3-, and NH4+ distribution within the profile of a Distroferric Red Latosol. The equivalent of 8 t ha-1 of plant residues were placed on soil surface. Lime was applied on the soil surface and nitrogen was applied over the straw at 0, 50, 100, and 150 mg kg-1, as ammonium nitrate. Corn was grown for 57 days. Calcium contents and pH in the soil profile were decreased by Pearl millet residue, while black oat and oilseed radish increased Ca contents and these effects are not related with Ca contents in residue tissue. However, the presence of plant residues increased nitrate, ammonium, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium; Magnesium; Nitrogen; Potassium; Soil bases; No till.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300003

Dissolved Nitrogen and Phosphorus Dynamics in the Lower Portion of the Paraiba do Sul River, Campos dos Goytacazes, RJ, Brazil
Provedor de dados: 52
Autores: Silva,Mônica Aparecida Leite; Calasans,Claudia Ferreira; Ovalle,Alvaro Ramon Coelho; Rezende,Carlos Eduardo.
The Paraíba do Sul river lower reach was monitored monthly between August 1995 and July 1996. This study was aimed at evaluating the temporal dynamics of dissolved nitrogen and phosphorus and its main controlling factors. Minimum and maximum observed values were as follows: N-NO2- - 0.08/0.51; N-NO3- - 21/57; N-NH4+ - 1.4/6.7; DON - 4.9/86.0; DIN -24.5/60.9; P-PO4(3-) - 0.43/1.66; DOP - 0.05/0.92; pH - 6.2/7.8; Dissolved Oxygen - 6.4/10.1; Conductivity - 48/74; Temperature - 20.5/31.1 (Nutrients - µM; Dissolved Oxygen - mg/l; Conductivity - µS/cm; Temperature - °C). Discharge presented a characteristic seasonal variation, showing a peak in January. Increasing P-PO4(3-), DOP, N-NH4+ and N-NO2- concentrations with increasing discharges could be associated to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved nutrients; Paraíba do Sul River; Temporal dynamics; Nitrogen; Phosphorus; Discharge.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400006

Azo dye degradation by Phanerochaete chrysosporium in the medium enriched with nitrogen in the presence of primary co-substrate
Provedor de dados: 52
Autores: Andrade,Marcus Vinicius Freire; Silva,Karla Mayara Lima da; Siqueira,João Paulo da Silva; Wanderley,Carlos Ronald Pessoa; Araújo,Rinaldo dos Santos; Marinho,Gloria; Rodrigues,Kelly.
This work sought to evaluate the ability of fungi Phanerochaete chryosporium to degrade congo red azo dye in batch reactor, evaluate the influence of glucose and wheat bran as co-substrates on the removal of the dye in the medium and investigate the influence of ammonium chloride, ammonium nitrate and ammonium sulfate as the inorganic nitrogen source for the process. Wheat bran was not effective satisfactorily for the removal of dye and organic matter had no desired effect for the removal of color and organic matter and showed the lowest values of k2, 0.008 M-1.d-1and 0.0004 M-1.d-1, respectively. Glucose presented the best response with the highest final percentage of dye removal (97%) and rate of dye removal (0.017 M-1.d-1), without adding an external...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wheat bran; Glucose; Congo red; Fungi; Nitrogen.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500019

Influence of photoperiod on the uptake of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata
Provedor de dados: 57
Autores: PETRUCIO,M. M.; ESTEVES,F. A.
The main goal of this research was to quantify the concentrations of total and ammonium N, nitrate, total and soluble P in the water in the presence of Eichhornia crassipes and Salvinia auriculata, which were submitted to two different photoperiods in a 24 hours incubation period in the laboratory. The macrophytes were incubated in plastic vials of approximately 1.5 litters, with a previously prepared solution with NH4NO3, NH4Cl, and KH2PO4. Eichhornia crassipes showed the highest average rate of reduction of all the nutrients analysed in relation to Salvinia auriculata. The largest photoperiod reflected in a higher average rate of reduction of nutrients, in both plants. Therefore, we may expect that in some periods of the year (e.g. summer), the aquatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eichhornia crassipes; Aquatic macrophytes; Nitrogen; Phosphorus; Salvinia auriculata.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300002

Uptake rates of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata
Provedor de dados: 57
Autores: PETRUCIO,M. M.; ESTEVES,F. A.
The main goal of this research was to survey information about the physiology of Eichhornia crassipes and Salvinia auriculata and their capacity to remove nitrogen and phosphorus from the environment, after quantifying the concentrations of the nitrogen (NO3-N, NH4-N and total-N) and phosphorus (PO4-P and total-P) compounds in the water. The macrophytes were incubated in the laboratory in plastic vials of approximately 1.5 litters containing a previously prepared solution of NH4NO3, NH4Cl and KH2PO4. Eichhornia crassipes exhibited the highest rates of nutrient reduction and the concentrations of NO3-N, NH4-N and PO4-P in the water influenced the uptake rates of nitrogen and phosphorus of the E. crassipes and S. auriculata. This information can help to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic macrophytes; Eichhornia crassipes; Nitrogen; Phosphorus; Salvinia auriculata.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200006

Soil amendment with sewage sludge and its impact on soil microflora
Provedor de dados: 58
Autores: Vieira,Rosana Faria; Silva,Célia Maria Maganhotto de Souza.
The objective of this work was to verify the effect of frequent sludge soil amendments on the soil's activity and microbial biomass C. Results showed that the use of excessive sludge doses could be detrimental to the soil's microflora.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microorganisms; Nitrogen; Biosolid.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000500019

Nitrogen consumption during batch cultivation of Neisseria meningitidis (serogroup C) in Frantz medium
Provedor de dados: 58
Autores: Baruque-Ramos,Júlia; Hiss,Haroldo; Vicentin,Márcio Alberto; Paz,Marcelo Fossa da; Peixoto,Argélia; Leal,Maria Betania Batista; Sato,Rony Akio; Vassoler,Umbelina Macedo; Raw,Isaías.
Capsular polysaccharide, extracted from microorganism cultivations, is the principal antigen for elaboration of vaccine against the disease caused by Neisseria meningitidis serogroup C. The final protein content allowed in this vaccine is 1%. In order to find a relationship between nitrogen consumption and cell growth, including polysaccharide production, and cell nitrogen content, cultivations were carried out in an 80 liters bioreactor (total capacity), under the following conditions: Frantz medium; temperature of 35ºC; air flow of 5 L/min (0.125 vvm); agitation frequency of 120 rpm and vessel pressure of 6 psi (kLa = 0.07 min-1). Concentrations of biomass, total polysaccharide, cellular nitrogen, residual organic and inorganic nitrogen in the medium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N. meningitidis; Vaccine; Polysaccharide; Nitrogen.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000400010

Modification of c and n sources for enhanced production of cyclosporin 'a' by Aspergillus Terreus
Provedor de dados: 58
Autores: Tanseer,Sundas; Anjum,Tehmina.
Most of the studies regarding cyclosporin 'A' production through fungi concentrate around Tolypocladium inflatum. This is mainly due to lower reported production of this drug in other fungi. The present study was therefore conducted to explore indigenous isolates of Aspergillus terreus for synthesis of this drug and defining a production medium for obtaining high yield of cyclosporin 'A'. For this purpose carbon and nitrogen sources were optimized for the selected best strain of A. terreus. Overall results depicted that the best cyclosporin 'A' yield from selected Aspergillus terreus (FCBP58) could be obtained by using production medium containing glucose 10% as carbon source and peptone 0.5% as nitrogen source. This modification in production medium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus terreus; Cyclosporin 'A'; Carbon; Nitrogen.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000400019

Growth and photosynthetic responses of Picea asperata seedlings to enhanced ultraviolet-B and to nitrogen supply
Provedor de dados: 61
Autores: Yao,Xiaoqin; Liu,Qing; Han,Chao.
Ultraviolet-B (UV-B) radiation and nitrogen are expected to increase simultaneously with future changes in global climate. In this study, growth and photosynthetic responses of Picea asperata seedlings to enhanced UV-B and to nitrogen supply were studied. The experimental design included two levels of UV-B treatments (ambient UV-B, 11.02 kJ m-2 d-1; enhanced UV-B, 14.33 kJ m-2 d-1) and two nitrogen levels (0; 20 g N m-2) to determine whether nitrogen can alleviate the negative impacts of enhanced UV-B on seedling growth and photosynthesis. Enhanced UV-B significantly inhibited plant growth and impaired net photosynthetic rate, stomatal conductance, transpiration rate, the light-saturated assimilation rate, assimilation capacity, light compensation point,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Gas exchange; Nitrogen; Picea asperata; Photosynthesis; UV-B.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100002

Growth and total-N content of Prosopis juliflora (SW) D. C. are stimulated by low NaCl levels
Provedor de dados: 61
Autores: Viégas,Ricardo Almeida; Fausto,Maria José Martins; Queiroz,José Elenildo; Rocha,Iza Marineves Almeida; Silveira,Joaquim Albenísio Gomes; Viégas,Pedro Roberto Almeida.
In this study the early effects of salinity on growth, total N and ion accumulation and partitioning in Prosopis juliflora (common name algaroba) were studied with 30-day-old plants grown for 8 days in aerated nutrient solution (NS) free of (control) or supplied with 25, 50, 75 and 100 mmol.L-1 NaCl. Plants grown in 25 and 50 mmol.L-1 NaCl accumulated a total dry mass (DM) and shoot N content greater than the control. However, at 75 and 100 mmol.L-1 NaCl such parameters were diminished. Whole plant transpiration rates were higher with 25 and 50 mmol.L-1 NaCl and lower with 75 and 100 mmol.L-1 NaCl. Salinity did not influence shoot (80%) and root (70%) water content (WC) but reduced the K+ content of shoot while that of root was not affected. Increasing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ion partitioning; Nitrogen; Salinity stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100009

Effect of Split Nitrogen Applications on Durum Wheat Cultivars in Volcanic Soil
Provedor de dados: 117
Autores: Hirzel,Juan; Matus,Iván; Madariaga,Ricardo.
Durum wheat (Triticum turgidum L. var. durum) is an important crop for the world population and occupies a large cultivated area worldwide. New cultivars need constant improvement of their agronomic management, within which N fertilization is highlighted. Durum wheat is also important in Chile where genetic breeding and agronomic management have been developed to increase yield, industrial, and nutritional grain quality. The objective of this experiment was to determine the appropriate number of N applications during a crop cycle in a volcanic ash soil in South Central Chile. Nitrogen split applications were carried out on three durum wheat cultivars in a Melanoxerands soil during the 2003-2004 and 2004-2005 seasons. A rate of 200 kg ha-1 N was applied at...
Tipo: Journal article
Palavras-chave: Durum wheat; Cultivars; Nitrogen; Split applications; Volcanic soil.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400009

Hosting Capacity of Horticultural Plants for Insect Pests in Brazil
Provedor de dados: 117
Autores: Leite,Germano L.D; Picanço,Marcelo; Zanuncio,José C; Moreira,Márcio D; Jham,Gulab N.
Factors such as fertilization, allelochemicals, trichomes, weather, and natural enemies can influence pest populations. Thus, it is necessary to understand the factors that predispose vegetable species to pests and the role of polyculture, crop rotation, and neighboring plants. The objective of this research was to study the hosting capacity for pests of Abelmoschus esculentus (L.), Brassica oleracea L. vars. acephala and capitata, Capsicum annuum L., Cucurbita moschata (Duchesne), Cucurbita maxima Duchesne and Cucumis sativus L., Lycopersicon esculentum Mill., Solanum gilo Raddi and Solanum melongena L., and Phaseolus vulgaris L. The higher density of Bemisia tabaci (Genn.) adults on C. sativus can be due to the higher amount of pentacosane and octacosane...
Tipo: Journal article
Palavras-chave: Trichomes; Allelochemicals; Nitrogen; Potassium; Insects.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300006

Availability of Nitrogen, Phosphorus and Potassium from Poultry Litter and Conventional Fertilizers in a Volcanic Soil Cultivated with Silage Corn
Provedor de dados: 117
Autores: Hirzel,Juan; Walter,Ingrid.
Poultry litter (PL) is an organic matter source used as soil amendment. Besides its important nutrient content, it is a cheap alternative to conventional fertilizers in crop production. The efficient use of PL also helps reduce the environmental problems normally associated with its disposal near poultry production farms. This article reports the relative effects of PL and conventional fertilizers on the availability of soil N, P and K, dry matter (DM) production and total nutrient content in silage corn (Zea mays L.). The field experiment was carried out in a soil derived from volcanic ash (Tipic Melanoxerands) of Central South Chile. Corn was grown for three seasons (2002-2005) and PL and conventional fertilizers were applied in the first two years. The...
Tipo: Journal article
Palavras-chave: Poultry litter; Soil fertility; Corn; Nitrogen; Phosphorus; Potassium.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300006

CO2 and N2O emissions from an Andisol in Chile under a no-till system using non-fixed closed chambers
Provedor de dados: 117
Autores: Muñoz,Cristina; Paulino,Leandro; Vera,Jenniffer; Zagal,Erick.
Chile has different types of soil and climate conditions that favor a wide range of agricultural activities that can generate potential atmospheric contamination like greenhouse gases (GHG). Nevertheless, the contribution of agricultural soils to atmospheric emissions has yet to be measured in Chile. The aim of this study was to assess seasonal variability of CO2 and N2O effluxes in situ from a volcanic ash-derived soil under different agronomic management practices. Gas samples were obtained from headspaces of non-fixed closed chambers in an annual crop rotation under a no-till system in an Andisol in southern Chile (36° S). Two N-sources (NH4+ and NO3-) and ammonium fertilization plus two lime doses (0.5 and 1 Mg ha-1) were considered for soil treatments...
Tipo: Journal article
Palavras-chave: Greenhouse gases; Agriculture; Nitrogen; Global change; Air pollution.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200013

Green Index to Estimate Crop Nitrogen Status in Potato Processing Varieties
Provedor de dados: 117
Autores: Giletto,Claudia Marcela; Díaz,Cecilia; Rattín,Jorge Edgardo; Echeverría,Hernán Eduardo; Caldiz,Daniel Osmar.
Nitrogen is the most important nutrient in growing potatoes (Solanum tuberosum L.) because either a deficit or excess in its supply can affect yield and quality, resulting in economic losses. To make a rational use of this nutrient, it is necessary to monitor N status during crop development. The green index (IV) could be a valuable method to assess N sufficiency. In experiments with variable N supply, the IV was assessed during crop growth and an N sufficiency index was derived (ISN-IV). The relationship between tuber yield and the IV and ISN-IV was established, as well as the association between the IV and ISN-IV and N concentration in the following varieties: Innovator, Bannock Russet and Gem Russet. During the vegetative growth stage, the IV and ISN-IV...
Tipo: Journal article
Palavras-chave: Nitrogen; Chlorophyll meter; Potato varieties.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100015

Evaluation of the ORYZA2000 Rice Growth Model under Nitrogen-Limited Conditions in an Irrigated Mediterranean Environment
Provedor de dados: 117
Autores: Artacho,Pamela; Meza,Francisco; Alcalde,José Antonio.
ORYZA2000 is a growth model for tropical lowland rice ( Oryza sativa L.) developed by the International Rice Research Institute and Wageningen University. This model has been evaluated extensively in a wide range of environments. However, reports examining japonica cultivars growing in temperate climates are scarce. In this study, ORYZA2000 was calibrated and evaluated using data from experiments carried out in the South-Central area of Chile. These experiments were performed on a japonica rice cultivar growing under an irrigated Mediterranean environment at various N rates. ORYZA2000 was then applied to explore potential yield and grain yield response to N fertilization under likely weather conditions in the major rice-producing area in Chile. ORYZA2000...
Tipo: Journal article
Palavras-chave: ORYZA2000 model; Irrigated rice; Nitrogen; Mediterranean environment; Chile.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100003

The influence of N and P supply and genotype on N remobilization in containerized Pinus radiata plants
Provedor de dados: 118
Autores: Bown,Horacio E; Watt,Michael S; Clinton,Peter W; Mason,Euan G.
A large proportion of the nitrogen (N) used in the current-year growth of the widely grown plantation species Pinus radiata D. Don is N that was stored in plant tissues the previous year. However, the extent to which an imbalance between levels of phosphorus (P) and N may change the capacity of plants to remobilize N is unknown. In this study, the N remobilization responses of four P. radiata genotypes to a factorial combination of N and P additions were assessed in containerized plants in a two-year greenhouse experiment. N supply was enriched with 15N at 2.5%o(labeled N) during the first year. Plants were then transferred to clean sand and grown for another year with 15N at levels close to natural levels (0.3664899 atom percent 15N, &amp;#948;15N...
Tipo: Journal article
Palavras-chave: Genotypes; Nitrogen; Nutrient remobilization; Phosphorus; Pinus radiata.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300010

Soil C/N influences the carbon flux and partitioning in control and fertilized mini-plots of Pinus radiata in New Zealand
Provedor de dados: 118
Autores: Bown,Horacio E; Watt,Michael S; Clinton,Peter W; Mason,Euan G.
Patterns of carbon flux and partitioning were examined in highly stocked (40,000 stems ha-1) control and fertilized mini-plots of Pinus radiata D. Don at five sites, which covered a wide climatic and edaphic gradient on the South Island of New Zealand. The gross-primary productivity (GPP) and the partitioning of the GPP to the above- and below-ground productivity and respiration were determined using a carbon budget approach. All of the components of the GPP, the above-ground net primary productivity (ANPP [r² = 0.67, P &amp;#8804; 0.01]), above-ground plant respiration (APR [r² = 0.66, P &amp;#8804; 0.01]), and total below-ground carbon flux (TBCF [r² = 0.41, P &amp;#8804; 0.01]) significantly increased with the GPP, but the ANPP:GPP, APR:GPP and TBCF:GPP...
Tipo: Journal article
Palavras-chave: Gross- primary productivity; Net-primary productivity; Nitrogen; Pinus radiata D. Don; Phosphorus; Total below-ground carbon flux; Whole carbon budget.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200013

Photosynthetic and antioxidant performance are differentially affected by short-term nitrogen supply in highbush blueberry cultivars
Provedor de dados: 118
Autores: Yañez-Mansilla,Erwin; Cartes,Paula; Reyes-Díaz,Marjorie; Ribera-Fonseca,Alejandra; Alberdi,Miren.
Nitrogen (N) is an essential nutrient for photosynthesis and may influence phenolic compound synthesis in higher plants. The effect of different amounts of N (0 to 38 mM) provided on a short-term (4 d) basis on the photosynthetic and antioxidant performance of highbush blueberry cultivars (Legacy and Bluegold) grown in a nutrient solution was studied. In both cultivars, the N concentration of leaves slightly increased in response to the N supply, with Bluegold frequently showing higher N concentrations than Legacy. Photosynthesis was reduced in Bluegold at the highest N dose, whereas in Legacy, a decrease of CO2 assimilation occurred under N starvation. This decrease in photosynthesis was accompanied by enhanced lipid peroxidation but only in Bluegold. In...
Tipo: Journal article
Palavras-chave: Nitrogen; Oxidative damage; Phenolic compounds; Superoxide dismutase; Vaccinium corymbosum.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100006

Land disposal potential of tobacco processing residues
Provedor de dados: 65
Autores: Tedesco,Marino José; Lauschner,Márcio Henrique; Gianello,Clesio; Bortolon,Leandro; Kray,Claudio Henrique.
Brazil is one of the leaders in the production and trading of tobacco leaves in the global market, which results in a large amount of residues that would be recycled and used as soil fertilizers in agriculture. This research aimed to study the land disposal potential and agricultural use of tobacco processing residues (TPRs), their mineralization and the nutrient supply to the plants. The study was carried out in an open area using pots with 32dm³ of a sandy soil (Paleudult), provided with water drainage collectors and tilled with three corn plants each. Eighteen treatments were tested with mineral fertilization, poultry manure (PM), earthworm compost (EC) and increasing rates (0, 7.5, 15, 30 e 60t ha-1) of TPR D (dust) and TPR S (stem fibers).Treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient cycling; Nitrogen; Water quality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000200009

Diazotrophic bacteria and nitrogen fertilization on the growth of micropropagated pineapple plantlets during acclimatization
Provedor de dados: 65
Autores: Silva,Aurilena de Aviz; Carvalho,Almy Junior Cordeiro de; Freitas,Flávia Paiva de; Pessanha,Patrícia Gomes de Oliveira; Santos,Paulo Cesar dos; Silva,Mírian Peixoto Soares da; Vasconcelos,Tábatha de Souza; Olivares,Fábio Lopes.
ABSTRACT: This study examines the effect of inoculation with diazotrophic bacteria and nitrogen fertilization on the growth of micropropagated pineapple cv. 'Vitória' plantlets during the acclimatization period. The experiment was carried out in a greenhouse in Campos dos Goytacazes, in randomized blocks, using a 2x5x5 factorial scheme, with the factors being two types of inocula (absence or presence of a mixture of diazotrophic bacteria that contained Burkholderia sp. UENF 114111, Burkholderia silvatlantica UENF 11711, and Herbaspirillum seropedicae HRC 54), five levels of urea (0, 2, 5, 7, and 10g L-1), and five evaluation periods (30, 60, 90, 120, and 150 days following the planting of plantlets in trays), and with four replications of each treatment....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus; Plant growth-promoting bacteria; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001101952

Partial correlation analysis in the study of morphogenesis and herbage accumulation in Panicum maximum cv. ‘Tanzânia’
Provedor de dados: 65
Autores: Braz,Thiago Gomes dos Santos; Martuscello,Janaina Azevedo; Santos,Manoel Eduardo Rozalino; Pereira,Vinícius Valim.
ABSTRACT: The objective of this study was to evaluate, through partial correlation analysis, the degree of association between herbage accumulation and morphogenetic traits of ‘Tanzania’ grass (Panicum maximum Jacq.) defoliated with 95% of light interception and fertilized with nitrogen, under different planting densities. The experiment was carried out in a randomized complete design with 12 treatments and two replicates, in a 4 × 3 factorial arrangement consisting of four nitrogen rates (0, 80, 160, and 320kg ha-1 Yr-1) and three planting densities (9, 25, and 49 plants m-2). Harvests were performed at 25cm above the soil, when the plots intercepted 95% of the incident light. The simple correlation coefficients between herbage accumulation and leaf and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Pasture management; Pearson correlation; Plant density.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900402

Fruit yield and composition in orange trees cv. 'Lane Late' in response to nitrogen fertilization in Sandy Typic Hapludalf soil
Provedor de dados: 65
Autores: Brunetto,Gustavo; Cella,Cesar; Miotto,Alcione; Girotto,Eduardo; Lorensini,Felipe; Brackmann,Auri; Ceretta,Carlos Alberto; Schorr,Márcio Renan Weber; Both,Vanderlei; Ambrosini,Vítor Gabriel.
ABSTRACT: Little is known about the impact of N fertilization on fruit production and composition in orange groves grown in soils with low or medium organic matter content in Rio Grande do Sul (RS). This study aimed to evaluate how N fertilization of orange trees cv. 'Lane Late' in a sandy soil may interfere in fruit yield and composition of fruit and juice. The experiment was conducted with orange trees cv. 'Lane Late' growing in Sandy Typic Hapludalf soil, in Rosário do Sul (RS). The plants received applications of 0, 20, 40, 60, 80, 100, 120, 140 and 160kg N ha-1. Total N in leaves, number of fruits per plant, yield, fresh weight, fruit diameter, peel thickness, percentage of fruit juice, peel color, juice color, ascorbic acid content, total soluble...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Leaf analysis; Fruit quality; Citrus sinensis L.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300253

Soil nitrogen application in the spring did not increase apple yield
Provedor de dados: 65
Autores: Ernani,Paulo Roberto; Dias,Jaques.
Since there is no chemical method to assess N availability from field soil samples, this nutrient is still recommended based on regional field trials. This study aimed to evaluate the effect of spring application of N to the soil on fruit yield of apple cultivars. Two experiments were carried out, respectively for ‘Gala’ and ‘Fuji’. The trees, grafted on MM 106 rootstock, were planted in 1987, spaced 4.50 x 1.80m, in a clayed Oxisol (Hapludox) with 4.0% of organic matter, in Vacaria (RS), Southern Brazil. Treatments were applied annually, from the spring of 1990, in the tree row, over a 1.5-m-wide strip, as urea, and consisted of four rates of N corresponding to 0, 27.5, 55.0 and 82.5kg ha-1 in the first three years, and respectively 0, 50, 100 and 120kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apple yield; Nitrogen; ‘Gala’; ‘Fuji’.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781999000400013

Factors affecting colonization and abundance of Aphis gossypii glover (hemiptera: aphididae) on okra plantations
Provedor de dados: 64
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Zanuncio,José Cola; Gusmão,Marcos Rafael.
The control of Aphis gossypii Glover (Hemiptera: Aphididae) on okra Abelmoschus esculentus (L.) (Malvaceae) consist primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to determine the effects of predators and parasitoids, height of canopy, plant age, leaf areas, organic compounds leaves, levels of leaf nitrogen and potassium, density of leaf trichomes, total rainfall and median temperature on attack intensity of A. gossypii on two successive A. esculentus var. Santa Cruz plantations. Monthly number estimates of A. gossypii and natural enemies (visual inspection) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence, leaf areas and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abelmoschus esculentus; Aphid; Natural enemies; Leaf area; Nitrogen.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000200011

Productivity and efficiency of nitrogen fertilization in maize under different levels of urea and NBPT-treated urea
Provedor de dados: 64
Autores: Silva,Douglas Ramos Guelfi; Pereira,André Ferreira; Dourado,Ronaldo Liberato; Silva,Frederico Pinto da; Ávila,Fabrício William; Faquin,Valdemar.
The management of nitrogen fertilization is complex due to the various transformations of the nitrogen that occur in the soil-plant-atmosphere system, reducing the efficiency of the fertilization, productivity and the profit margin of the maize production areas. This study aimed to evaluate the effect of different levels of common urea and urea treat with NBPT [N-(n-butyl) thiophosphoric triamide] on the productivity and efficiency of the nitrogen fertilization in maize, correlated with simple economic analysis. The design of the field experiment was in randomized complete blocks with six repetitions, in a 2 x 4 factorial outline, made up of by two sources of nitrogen (urea and NBPT-treated urea) and four levels of nitrogen as top dressing (60, 120, 180...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Zea mays; Nitrogen; Urease inhibitor; Agronomic efficiency; Gross profit margin.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000300012

Multispectral aerial images for the evaluation of maize crops
Provedor de dados: 64
Autores: Hoss,Douglas Felipe; Luz,Gean Lopes da; Lajús,Cristiano Reschke; Moretto,Marcos Antônio; Tremea,Geraldo Antonio.
ABSTRACT The combination of multispectral aerial images and computational processing is emerging as one of the solutions used in precision agriculture to observe the nutritional status of plants. The objective of this study is therefore to associate the nitrogen content and dry weight of the aerial part of maize plants (DW) with the vegetation indices obtained by multispectral aerial images (NDVIA and NDREA), and with the SPAD index and the Greenseeker NDVI, in the vegetative stage V6. To this end, randomized blocks in a factorial scheme of 6x4 (six nitrogen doses at the base and four different flight altitudes) were used, with three replications. The collected data was submitted to ANOVA with the F test (p = 0,05) and subsequent regression analysis. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Precision agriculture; Nitrogen; Computational processing.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100216