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| Registros recuperados: 425 | |
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| 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,... |
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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 |
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| 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... |
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Palavras-chave: Nitrógeno; Dinámica Nutrimental; Diagnostico Nutrimental; Nitrogen; Nutritional Dynamics; Nutritional Diagnosis; Edafología; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2149 |
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| 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,... |
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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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 425 | |
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