Consulta: subjectFacets:"Nitrogen fertilization"
Registros recuperados: 67
Data/hora: 05/06/2024 10:03:44

PLANTING FERTILIZATION AND NITROGEN DOSES IN TOPDRESSING IN SECOND-CROP CORN
Provedor de dados: 196
Autores: Silva, Luciana Maria da; Silva Junior, Rogério Lamim; Leão Pereira Resende, Cecília; Marangoni Montes, Rafael; Santiago Silva Benett, Katiane; Benett, Cleiton Gredson Sabin.
O presente trabalho teve como objetivo avaliar a influência da adubação com formulados na semeadura e doses de nitrogênio em cobertura sobre as características produtivas do milho cultivado na safrinha. O experimento foi conduzido entre os meses de março a junho de 2018, na fazenda da Universidade Estadual de Goiás, Unidade Universitária de Ipameri-GO. O delineamento experimental utilizado foi o de blocos casualizados no esquema fatorial 3 x 5 sendo três formulações de adubos na semeadura (06-22-12; 08-20-15 e 06-22-12 + 2% de carbono orgânico) e cinco doses de N (0, 50, 100, 150 e 200 kg ha-1) em cobertura, com quatro repetições. Determinou-se o teor de nitrogênio foliar, massa fresca e seca de folhas, altura de plantas, diâmetro do colmo, altura de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Nitrogen fertilization; Fertilizer of planting; Zea mays L.; Adubação nitrogenada; Adubo de plantio.
Ano: 2022
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6968

Diagnóstico de los factores físicos, técnicos y socioeconómicos que limitan la productividad y rentabilidad de la caña de azúcar.
Provedor de dados: 32
Autores: Rodríguez González, Agustín.
El presente trabajo se llevó a cabo durante la zafra 2010-11 en la zona central del estado de Veracruz (18°51’24” y 19°05’47” latitud norte; 96°26’52” y 96°48’25” longitud oeste) en el que se planteó que la disponibilidad de humedad y el manejo de la fertilización son factores que limitan la productividad de la caña de azúcar en condiciones de secano. Con base en el registro histórico de 10 estaciones climáticas, se delimitaron tres áreas con distinta pluviometría y una con riego como referencia. La problemática técnica se evaluó a partir del conocimiento local mediante la aplicación de encuestas a 500 cañeros (20% del total de agricultores de la zona de interés) y en cada parcela se midió el rendimiento de caña. Los datos obtenidos en campo (rendimientos...
Palavras-chave: Precipitación; Fertilización nitrogenada; Rendimiento en socas; Saccharum officinarum; Recipitation; Nitrogen fertilization; Ratoon yield; Hidrociencias; Doctorado.
Ano: 2011
URL: http://hdl.handle.net/10521/582

EFFECT OF HEIGHT, TILT AND TWIST ANGLES OF AN ACTIVE REFLECTANCE SENSOR ON NDVI MEASUREMENTS
Provedor de dados: 70
Autores: Stocker,Vinícius; Souza,Eduardo G. de; Johann,Jerry A.; Beneduzzi,Humberto M.; Silva,Franciléia de O. e.
ABSTRACT The application of nitrogen (N) fertilizer is complex and expensive, so its correct management has financial and environmental benefits. The use of optical proximity sensors is a promising technique. However, the movement of the agricultural machinery or of the person carrying the sensor will result in height differences and/or different tilt and twist angles with respect to the canopy. We considered whether these variations would affect the reflectance measurement. In this study, we took normalized difference vegetation index (NDVI) readings of a wheat canopy, to which 90 kg ha-1 of urea had been applied in stage 5, and observed the NDVI in stages 6, 8 and 10.5. We also tested soybeans, to which 90 kg ha-1 of urea had been applied in stage R1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Precision agriculture; GreenSeeker; NDVI.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000800096

PRODUCTIVITY OF IRRIGATED JAMBU UNDER SOIL-WATER STRESSES AND NITROGEN DOSES
Provedor de dados: 70
Autores: Aviz,William L. C. de; Lima Junior,Joaquim A. de; Silva,André L. P. da; Oliveira,Pedro D. de; Gama,Cândido M. P.
ABSTRACT Jambu (Acmella oleracea (L.) R.K.) is a short-cycle leafy vegetable from the Amazon region, which needs an adequate availability of water and nutrients, mainly nitrogen, to obtain a rapid mass increase. This research aimed to study the effect of different soil-water stresses and nitrogen doses on jambu cultivation in the state of Pará. The experiments were conducted at the Igarapé-Açu experimental farm of the Federal Rural University of Amazonia (UFRA). The Jamburana variety was used in a 10 × 10 cm spacing, using a randomized block design in a 4 × 4 factorial scheme with three replications. Each plot had a dimension of 0.4 × 0.5 m (0.2 m2), totaling 20 plants in 4 rows, but only the plants of the central rows were useful. Treatments consisted of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acmella oleracea (L.) R.K.; Tensiometry; Dripping; Nitrogen fertilization.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100016

Irrigation with domestic treated sewage and nitrogen fertilizing in sunflower cultivation
Provedor de dados: 70
Autores: Bezerra,Francicso M. L.; Freitas,Cley A. S. de; Silva,Alexandre R. A. da; Mota,Suetônio de B.; Aquino,Boanerges F. de.
The objective of this study was to evaluate the productive performance of sunflower plants irrigated with different levels of domestic treated sewage and groundwater well with different doses of nitrogen. It was used randomized blocks design in split-split plots with four replications. In the plots, we evaluated the effect of two types of irrigation water, in the subplots we evaluated the five irrigation levels expressed as 25, 50, 75, 100 and 125% of the Class A pan Evaporation (CAE), and in the sub subplots, we evaluated the effect of four different doses of nitrogen (25, 50, 75 and 100 kg ha-1). The irrigation of sunflower with domestic sewage produced greater yield potential of grain and oil. The use of water from treated wastewater can replace up to...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Helianthus annuus; Recycle; Drip irrigation; Nitrogen fertilization.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600014

Urea concentration on vegetative development and nutrition of Cactaceae epiphytic species
Provedor de dados: 75
Autores: Tavares,Armando R; Ferreira,Mauricio L; Jocys,Teresa; Kanashiro,Shoey; Silva,Karina G.
ABSTRACT Rhipsalis paradoxa, Rhipsalis baccifera and Hatiora salicornioides are epiphytic cacti from the Atlantic Forest. They have a great ornamental potential due to the exotic characteristic of their joints (stems segments). The study aimed to evaluate the growth and development of roots and shoots as well as macronutrient and micronutrient contents in the joints of these species fertilized with different concentrations of urea as a nitrogen source. The study also analyzed the importance of the root system on nitrogen absorption. Plants were weekly irrigated with modified Hoagland &amp; Arnon solutions with 0, 16.7, 33.3, 49.9 or 66.6 mM N applied as urea. After 180 days of cultivation, plants were separated into joints and roots for biometric and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhipsalis paradoxa; Rhipsalis baccifera; Hatiora salicornioides; Nitrogen fertilization; Stems and roots; Nutrient levels.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000300340

Tomato fertigation with dairy cattle wastewater
Provedor de dados: 75
Autores: Jorge,Marcos F; Pinho,Camila F; Nascentes,Alexandre L; Alves,Dinara G; Almeida,Gilda V; Silva,Jonathas BG; Silva,Leonardo DB.
ABSTRACT The use of wastewater in the fertigation of agricultural crops increases productivity and product quality, and contributes to reduce environmental pollution. In this work, the objective was to evaluate how the use of dairy cattle wastewater (DCWW) in the fertigation of tomatoes affected production and productivity, as well as foliar nutritional contents, in an organic farming system. Treatments consisted of six nitrogen doses (0, 50, 100, 200, 300 and 400%), having N recommendation for tomato (100 kg/ha) as reference, applied using DCWW via fertigation. DCWW is made up of washing water, urine, feces and milk. Stem diameter, branch length, weekly fruit yield per plant and aggregate productivity were evaluated. N, P, K, Ca, Mg, S, Cu, Mn, Fe, Zn and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Foliar analysis; Nitrogen fertilization; Final disposal.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200230

Nitrogen content, SPAD index and production of single head broccoli
Provedor de dados: 75
Autores: Vidigal,Sanzio M; Puiatti,Mário; Lopes,Iza Paula de C; Sediyama,Maria Aparecida N.
ABSTRACT In the management of single head broccoli nitrogen fertilization, there is no study indicating the critical level and adequate range of N content and SPAD index in the leaves to evaluate the nitrogen nutritional status. This work was carried out in two consecutive years with control without N and three rates of N (150; 300 and 450 kg ha-1). The treatments were arranged in the experimental design of random blocks, with four replications. All productive characteristics were significantly influenced by N rates. The fresh inflorescence mass reached a maximum value of 822 g with 308 kg ha-1 N. The critical levels were 61.1 g kg-1 for total N foliar content and 71.31 ud SPAD at 40 DAT. The SPAD index presented high correlations with the total N content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. italica; Nutritional diagnosis; Nitrogen fertilization.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100052

Onion productivity in relation to irrigation water depths and nitrogen doses
Provedor de dados: 75
Autores: Baptestini,Júlio Cezar M; Oliveira,Rubens A; Vidigal,Sânzio M; Puiatti,Mário; Cecon,Paulo Roberto.
ABSTRACT Onion is considered the third most important vegetable in terms of economic value in Brazilian horticulture. The factors of production which most limit the productivity of the species are water and nutrients; so, irrigation and soil fertility control are determinant criteria for crop success. The aim of this study was to evaluate the influence of different water depths and nitrogen doses on the productivity of onion, Aquarius hybrid. Five water depths [(0, 75, 100, 125 and 150% of crop evapotranspiration (ETc)] and five nitrogen doses (0, 120, 180, 240 and 300 kg ha-1, urea form), arranged in a scheme of subdivided plots, in a completely randomized design with four replicates. We used sprinkler irrigation system. Irrigation management and water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Irrigameter; Nitrogen fertilization.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100073

Biomass production and essential oil of lemon balm cultivated under colored screens and nitrogen
Provedor de dados: 75
Autores: Alves,Aglair C; Jesus,Fábio N; Alves,Péricles B; Santos,Hamilton V; Souza,Girlene S; Santos,Anacleto R.
ABSTRACT The aim of this study was to evaluate the effect of light quality and nitrogen availability on the biomass production, yield and composition of essential oil of lemon balm (Lippia alba). Five doses of N (0; 40; 80; 120 and 160 kg ha-1) were studied, using urea and three light quality conditions obtained with the use of colored shading nets (blue and red), 50% irradiance and under full sun. The experiment was arranged in a 5x3 factorial scheme, in split plots, with seven replicates. After 60 days of cultivation under the shading nets, a higher dry leaf biomass (4.83 g per plant) was observed in the plants under blue net cultivation at a dose of 102 kg ha-1 of N. The plants grown under full sun presented greater amount of neral and geranial, major...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lippia alba; Shading nets; Nitrogen fertilization; Medicinal plant; Light quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100094

Foliar and topdressing application of nitrogen to the common bean crop
Provedor de dados: 86
Autores: Kotz-Gurgacz,Tailene Elisa; Soratto,Rogério Peres; Guidorizzi,Fernando Vieira Costa.
Abstract: The objective of this work was to evaluate the effect of applying N sources to leaves and N rates to the soil on the growth, N uptake, and grain and crude protein yields of the common bean (Phaseolus vulgaris) crop. Three experiments - two irrigated and one rainfed - were conducted during the 2012/2013 agricultural season, in a randomized complete block design with four replicates. The treatments consisted of the application of: four N rates (0, 45, 90, and 180 kg ha-1) to the soil, as topdressing in the V4 stage; and five N sources/rates - i.e., control, without foliar N application; 2.5 kg ha-1 N as conventional urea (N-CU); 5.0 kg ha-1 N-CU; 2.5 kg ha-1 N as slow-release urea-formaldehyde (N-SR); and 5.0 kg ha-1 N-SR - to leaves, in the R5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Foliar fertilization; Nitrogen fertilization; Slow release; Urea-formaldehyde.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201329

Sugarcane response to nitrogen rates, measured by a canopy reflectance sensor
Provedor de dados: 86
Autores: Rosa,Hugo José Andrade; Amaral,Lucas Rios do; Molin,José Paulo; Cantarella,Heitor.
Abstract:The objective of this work was to evaluate whether a canopy sensor is capable of estimating sugarcane response to N, as well as to propose strategies for handling the data generated by this device during the decision-making process for crop N fertilization. Four N rate-response experiments were carried out, with N rates varying from 0 to 240 kg ha-1. Two evaluations with the canopy sensor were performed when the plants reached average stalk height of 0.3 and 0.5 m. Only two experiments showed stalk yield response to N rates. The canopy sensor was able to identify the crop response to different N rates and the relationship of the nutrient with sugarcane yield. The response index values obtained from the canopy sensor readings were useful in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NDVI; Nitrogen fertilization; Optical sensor; Precision agriculture; Proximal sensing.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000900840

Nitrogen translocation in wheat inoculated with Azospirillum and fertilized with nitrogen
Provedor de dados: 86
Autores: RODRIGUES,OSMAR; DIDONET,AGOSTINHO DIRCEU; GOUVEIA,JORGE A.; SOARES,RITA DE CÁSSIA.
The productivity and the translocation of assimilates and nitrogen (N) were compared after inoculation of wheat (Triticum aestivum L., cv. BR-23) seeds with two strains of Azospirillum brasilense (strains 245 and JA 04) under field conditions. The inoculation of wheat seeds was done with a peat inoculant at sowing time. Plant material for evaluations were collected at anthesis and maturity. No differences in grain yield and in the translocation of assimilates resulting from inoculation were detected. Differences were observed in relation to N rates (0, 15, and 60 kg ha-1). N content in the grain increased significantly in the bacteria-inoculated treatments in which N was not added. This increase in N content in the grain with inoculation was probably due...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Nitrogen fertilization; Nitrogen metabolism; Assimilation; Nitrogen fixing bacteria.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000000700023

Ammonium chloride as an alternative source of nitrogen for sugarcane during two consecutive cycles
Provedor de dados: 86
Autores: Megda,Michele Xavier Vieira; Mariano,Eduardo; Leite,José Marcos; Megda,Marcio Mahmoud; Trivelin,Paulo Cesar Ocheuze.
Abstract: The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop’s shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four N doses (50, 100, 150, and 200 kg ha-1) applied as ammonium chloride (NH4Cl), besides a control, without the application of N. The increase in the NH4Cl dose increased in up to three times soil electrical conductivity in the layer of 0.0-0.2 m, with a consequent increase in the concentration of chlorine in leaves. In the second cycle, the contents of chlorine increased in 1,900 mg kg-1 in the leaf with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum; Electrical conductivity; Nitrogen fertilization; Root system; Stalk productivity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102100

Nitrogen management of forage grasses for nutrition, seed production, and nutrients in residual straw
Provedor de dados: 86
Autores: Catuchi,Tiago Aranda; Soratto,Rogério Peres; Francisquini Júnior,Amarildo; Guidorizzi,Fernando Vieira Costa; Tiritan,Carlos Sérgio.
Abstract: The objective of this work was to evaluate the nutrition, accumulation of nutrients in residual straw, pure seed yield, and seed quality of the tropical forage grasses 'Mombaça' and 'Xaraés' subjected to topdressing with nitrogen fertilizer management. Field experiments were carried out in the municipalities of Rancharia and Presidente Prudente, in the state of São Paulo, Brazil. The treatments included a control (without N topdressing) and four N fractionation forms at different forage stages: 150 kg ha-1 N, at the vegetative phase (VP); 150 kg ha-1 N, at the beginning of the reproductive phase (RP), between panicle initiation and the prebooting stages; 100 kg ha-1 N, at VP plus 50 kg ha-1 N at RP; and 50 kg ha-1 N at VP plus 100 kg ha-1 N at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Megathyrsus maximus; Urochloa brizantha; Nitrogen fertilization; Nutrient accumulation; Time of application.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102501

Criteria for topdressing nitrogen application to common bean using chlorophyll meter
Provedor de dados: 86
Autores: Maia,Suelen Cristina Mendonça; Soratto,Rogério Peres; Liebe,Suzane Maria; Almeida,Adriana Queiroz de.
Abstract: The objective of this work was to establish the diagnostic leaf and the nitrogen sufficiency index (NSI) values most appropriate to estimate N requirement by the 'Pérola' common bean (Phaseolus vulgaris), based on chlorophyll meter monitoring. The diagnostic leaf was defined in an experiment with five N rates, and up to four sampling dates of the diagnostic leaves were evaluated (first, second, and third completely expanded leaves from the apex). The NSI was established in two crop seasons, under six N managements: M1, 40 kg ha-1 N at sowing + 80 kg ha-1 10 days after emergence (DAE) + 80 kg ha-1 20 DAE (reference rate); M2, 20 kg ha-1 at sowing + 40 kg ha-1 10 DAE + 40 kg ha-1 20 DAE (recommended rate); M3, 20 kg ha-1 at sowing + 30 kg ha-1 when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Diagnostic leaf; Nitrogen fertilization; Nitrogen sufficiency index; Nitrogen use efficiency; Relative chlorophyll index.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700512

Organic, organomineral, and mineral fertilizers with urease and nitrification inhibitors for wheat and corn under no-tillage
Provedor de dados: 86
Autores: Corrêa,Juliano Corulli; Grohskopf,Marco André; Nicoloso,Rodrigo da Silveira; Lourenço,Késia Silva; Martini,Rosemari.
Abstract: The objective of this work was to evaluate soil chemical attributes, leaf nitrogen content, and corn and wheat yields under a no-tillage system in response to the application of organic, organomineral, and mineral fertilizers with or without urease and nitrification inhibitors. The experiment was carried out on the field, with one wheat and two corn crops, on a Rhodic Kandiudox, in a randomized complete block design with six replicates. The evaluated treatments were: control, without fertilization; O, poultry litter as an organic fertilizer; O+I, poultry litter and inhibitors; OM, organomineral fertilizer; OM+I, organomineral fertilizer and inhibitors; U, urea as a mineral fertilizer; and U+I, super urea with the urease inhibitor alone. The use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Zea mays; Agronomic efficiency; Poultry litter; Nitrogen fertilization; Volatilization losses.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000800916

Watermelon cultivation in regeneration areas of a sugarcane field under different soil managements
Provedor de dados: 86
Autores: Araújo,Humberto Sampaio de; Branco,Roberto Botelho Ferraz; Moraes,Carolina Cinto de; Calori,Alex Humberto; Rós,Amarílis Beraldo; Purquerio,Luis Felipe Villani.
Abstract: The objective of this work was to evaluate watermelon (Citrullus lanatus) cultivation in regeneration areas of a sugarcane field, under different soil management systems and N fertilization regimes. Two experiments were carried out in the 2014/2015 and 2015/2016 harvest seasons, in areas of sugarcane plantation in Andradina, in the state of São Paulo, Brazil. Cultivations were performed in a randomized complete block design, with plots and subplots, and four replicates. The plots represented the tillage systems (conventional, minimum tillage, and no-tillage), and the subplots, the different N fertilization rates (0, 100, 200, and 300 kg ha-1) applied as topdressing. In 2014/2015, the minimum tillage system resulted in the highest commercial yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrullus lanatus; Conservational system; Crop rotation; Nitrogen fertilization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102500

Effects of nitrogen fertilization on heavy metal content of corn grains
Provedor de dados: 85
Autores: Rui,Yu-kui; Zhang,Fu-suo; Shen,Jian-bo.
Nitrogen fertilization has played a significant role in increasing crop yield, and solving problems of hunger and malnutrition worldwide. However, excessive nitrogen inputs do not significantly increase crop yields but may lead to many serious environmental problems. The effects of nitrogen fertilization rate were studied on heavy metal content of corn grains. Our results show that nitrogen fertilization management is beneficial for reducing production costs, protecting the environment, and improving the quality of farm products.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Nitrogen fertilization; Corn grain; Food safety; ICP-MS.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572009000200003

Risk and Nitrogen Application Decisions in Florida Potato Production
Provedor de dados: 31
Autores: Asci,   Serhat; Borisova,   Tatiana; VanSickle,   John J.; Zotarelli,   Lincoln.
This study focuses on development of agricultural best management practices (BMPs) for potato production areas in Northeast Florida, and presents the results of the initial situation assessment. BMP implementation is the primary strategy used by agencies and farmers to improve the efficiency and to ensure environmental sustainability of agricultural production. Although BMPs are defined as “economically feasible” and “cost-effective”, economic analysis conducted as a part of BMP development has been limited, leaving the room for disagreement about economic impacts of specific BMPs. As a part of the situation assessment, we used interviews, group discussions, a survey, and a field trip to collect information about farmers’ production practices and to...
Tipo: Presentation
Palavras-chave: Florida potato production; Partial budget analysis; Risk analysis; Best management practice; Nitrogen fertilization; Agribusiness; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Production Economics; Risk and Uncertainty.
Ano: 2012
URL: http://purl.umn.edu/119797

Harvest managements and cultural practices in sugarcane
Provedor de dados: 90
Autores: Castro,Sérgio Gustavo Quassi de; Franco,Henrique Coutinho Junqueira; Mutton,Miguel Ângelo.
The presence of trash from the mechanical harvest of green cane on sugarcane plantations promotes changes in the agricultural management, for example, in the mechanical cultural practices of ratoon cane in-between the rows and nitrogen (N) fertilization. The goal of this study was to evaluate the performance of sugarcane in different harvest systems, associated to the mechanical cultural practices in interrows and N rates. The study was carried out on a sugarcane plantation in Sales Oliveira, São Paulo, Brazil, with the sugarcane variety SP81-3250, on soil classified as Acrudox, in a randomized block design with split-split plots and four replications. The main treatments consisted of harvest systems (harvesting green cane or burnt cane), the secondary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Mechanical cultural practices; Green cane; Saccharum spp.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100030

Ammonia volatilization from nitrogen fertilizers in no-till wheat and maize in southern Brazil
Provedor de dados: 90
Autores: Viero,Fernando; Bayer,Cimélio; Fontoura,Sandra Mara Vieira; Moraes,Renato Paulo de.
Crop residues on the soil surface of no-till systems can intensify ammonia volatilization from N fertilizers applied to cereal crops. This study assessed the magnitude of N losses through ammonia volatilization from urea applied to no-till winter (wheat) and summer crops (maize) on a Typic Hapludox in the south-central region of Paraná, southern Brazil. In addition, the potential of alternative N sources (urea with urease inhibitor, liquid fertilizer, ammonium nitrate and ammonium sulfate) and different urea managements (fertilizer applied in the morning or afternoon) were evaluated. Two experiments with maize and wheat were carried out for two years, arranged in a randomized block design with four replications. Nitrogen volatilization losses were assessed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Efficiency; Yield.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500017

Ammonium chloride as nitrogen source in sugarcane harvested without burning
Provedor de dados: 90
Autores: Vieira,Michele Xavier; Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Otto,Rafael; Faroni,Carlos Eduardo.
The great difficulty of incorporation of N fertilizers into the "green sugarcane" system causes concern and since urea is the most commonly used source, there is the risk of loosing NH3 through volatilization. For this reason, a field experiment was undertaken (in a Hapludox Typic) with the objective of evaluating the agronomic efficiency of ammonium chloride on stubble of the second ratoon (SP89 1115), as well as its residual effect on the subsequent cycle (third ratoon). The experimental design was randomized blocks with four replications. Treatments consisted of three N rates (60, 120 and 180 kg ha-1 N) in the form of NH4Cl, in addition to a control treatment without the addition of N fertilizer. The ratoon cane of the second cutting was harvested in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Nitrogen fertilization; Ratoon cane.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400016

Nitrate role in basic cation leaching under no-till
Provedor de dados: 90
Autores: Crusciol,Carlos Alexandre Costa; Garcia,Rodrigo Arroyo; Castro,Gustavo Spadotti Amaral; Rosolem,Ciro Antonio.
Especially under no-tillage, subsuface soil acidity has been a problem, because it depends on base leaching, which has been associated with the presence of low molecular weigth organic acids and companion anions. The objective of this study was to evaluate exchangeable base cation leaching as affected by surface liming along with annual urea side-dressing of maize and upland rice. Treatments consisted of four lime rates (0, 1500, 3000, and 6000 kg ha-1) combined with four nitrogen rates (0, 50, 100, and 150 kg ha-1) applied to maize (Zea mays) and upland rice (Oryza sativa), in two consecutive years. Maize was planted in December, three months after liming. In September of the following year, pearl millet (Pennisetum glaucum) was planted without...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lime; Nitrogen fertilization; Nutrient cycling; Tropical soils.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600014

Yield performance of upland rice cultivars at different rates and times of nitrogen application
Provedor de dados: 90
Autores: Barreto,José Hildernando Bezerra; Soares,Ismail; Pereira,José Almeida; Bezerra,Antonio Marcos Esmeraldo; Deus,José Aridiano Lima de.
Nitrogen is the most important nutrient for rice (Oryza sativa L) yields. This study aimed to evaluate the response of upland rice cultivars to N rate and application times in a randomized block design, in subdivided plots with four replications. The studied factors were five rice cultivars (BRS MG Curinga, BRS Monarca, BRS Pepita, BRS Primavera, and BRS Sertaneja), three application times (100 % at planting, 50 % at planting - 50 % at tillering and 100 % at tillering) and four N rates (0, 50, 100, and 150 kg ha-1). All cultivars responded to increased rates and different times of N application, especially BRS Primavera and BRS Sertaneja, which were the most productive when 50 % N rates were applied at sowing and 50 % at tillering. The response of cultivar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L; Nitrogen fertilization; Production components.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200017

Nitrogen washing from C3 and C4 cover grasses residues by rain
Provedor de dados: 90
Autores: Rosolem,Ciro Antonio; Werle,Rodrigo; Garcia,Rodrigo Arroyo.
Crop species with the C4 photosynthetic pathway are more efficient in assimilating N than C3 plants, which results in different N amounts prone to be washed from its straw by rain water. Such differences may affect N recycling in agricultural systems where these species are grown as cover crops. In this experiment, phytomass production and N leaching from the straw of grasses with different photosynthetic pathways were studied in response to N application. Pearl millet (Pennisetum glaucum) and congo grass (Brachiaria ruziziensis) with the C4 photosynthetic pathway, and black oat (Avena Strigosa) and triticale (X Triticosecale), with the C3 photosynthetic pathway, were grown for 47 days. After determining dry matter yields and N and C contents, a 30 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cover crops; Nitrogen fertilization; Nutrient cycling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600014

Nitrous oxide and methane fluxes in south Brazilian gleysol as affected by nitrogen fertilizers
Provedor de dados: 90
Autores: Zanatta,Josiléia Acordi; Bayer,Cimélio; Vieira,Frederico C.B.; Gomes,Juliana; Tomazi,Michely.
Nitrogen fertilizers increase the nitrous oxide (N2O) emission and can reduce the methane (CH4) oxidation from agricultural soils. However, the magnitude of this effect is unknown in Southern Brazilian edaphoclimatic conditions, as well as the potential of different sources of mineral N fertilizers in such an effect. The aim of this study was to investigate the effects of different mineral N sources (urea, ammonium sulphate, calcium nitrate, ammonium nitrate, Uran, controlled- release N fertilizer, and urea with urease inhibitor) on N2O and CH4 fluxes from Gleysol in the South of Brazil (Porto Alegre, RS), in comparison to a control treatment without a N application. The experiment was arranged in a randomized block with three replications, and the N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Environmental impacts; Agriculture; Greenhouse effect.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500018

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

Production and water yield of cauliflower under irrigation depths and nitrogen doses
Provedor de dados: 91
Autores: Oliveira,Reginaldo M. de; Oliveira,Rubens A. de; Vidigal,Sanzio M.; Oliveira,Ednaldo M. de; Guimarães,Lorença B.; Cecon,Paulo R.
ABSTRACT Cauliflower is a brassica produced and consumed in Brazil, whose cultivation depends on the adequate supply of water and nutrients. The objective of this study was to evaluate the effect of irrigation depths and nitrogen doses on the production components and water yield of cauliflower hybrid Barcelona CMS. The treatments consisted of five irrigation water depths (0, 75, 100, 125 and 150% of the crop evapotranspiration) combined with five nitrogen doses (0, 75, 150, 300 and 450 kg ha-1). The experiment was conducted in a completely randomized design with a split-plot arrangement. The effects of these factors were evaluated using the response surface methodology. The water yield of the crop decreases with increasing irrigation water depth;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea L.; Irrigation management; Nitrogen fertilization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000800561

Soybean growth affected by seeding rate and mineral nitrogen
Provedor de dados: 91
Autores: Werner,Flávia; Balbinot Junior,Alvadi A.; Ferreira,André S.; Silva,Marcelo A. de A. e; Debiasi,Henrique; Franchini,Julio C.
ABSTRACT This study aimed to evaluate the effect of seeding rates and nitrogen (N) fertilization on plant growth in soybean cultivar with indeterminate growth habit. Two experiments were conducted in the 2013/14 and 2014/15 growing seasons, in a complete block design with split-plot scheme and six replicates. Four seeding rates (150, 300, 440 and 560 000 viable seeds ha-1) and two N doses (0 and 45 kg ha-1) were allocated in the plots and subplots, respectively. The cultivar NK7059 RR was used. The following traits were assessed: leaf, stem and total shoot dry matter, leaf/stem dry matter ratio, stem and leaf N content, SPAD index, plant height, first pod height, number of branches per plant and grain yield. Soybean growth is not affected by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max L.; Plant spatial arrangement; Nitrogen fertilization; Grain yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800734

Irrigated wheat subjected to inoculation with Azospirillum brasilense and nitrogen doses as top-dressing
Provedor de dados: 91
Autores: Alves,Cleiton J.; Arf,Orivaldo; Ramos,Ane F.; Galindo,Fernando S.; Nogueira,Lais M.; Rodrigues,Ricardo A. F.
ABSTRACT The use of Azospirillum brasilense in the wheat crop still presents contradictory results; thus, it is necessary to identify ideal conditions to obtain satisfactory results. The objective of this study was to investigate the interaction between Azospirillum brasilense and nitrogen doses in a wheat cultivar, conducted with irrigation in the Cerrado region of Mato Grosso do Sul. The experimental design was randomized blocks with a 4 x 2 factorial scheme, four nitrogen doses (0, 40, 80 and 120 kg ha-1) applied as top-dressing, associated or not with inoculation of wheat seeds with Azospirillum brasilense. The results show that there was no interaction between N and inoculation. The isolated effect of Azospirillum brasilense promotes an increase in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Nitrogen fertilization; Plant growth-promoting bacteria; Cerrado.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800537

Technological quality and yield of sugarcane grown under nitrogen doses via subsurface drip fertigation
Provedor de dados: 91
Autores: Rhein,Andressa F. L.; Pincelli,Renata P.; Arantes,Marcel T.; Dellabiglia,William J.; Kölln,Oriel T.; Silva,Marcelo de A.
ABSTRACT This study characterized the technological quality and yield of sugarcane cv. SP80-3280 under nitrogen doses via subsurface drip fertigation. Five treatments were established using N-fertilizer in the form of urea (0, 50, 100, 150 and 200 kg N ha-1), with four replicates, applied via subsurface drip fertigation. The technological quality (fiber% cane; Brix% juice; pol% juice, pol% cane; juice purity and total recoverable sugar - TRS), as well as yield of stalks and sugar were determined 381 days after the third harvest. The technological variables Brix%, pol% juice, purity% and TRS of sugarcane, cultivar SP80-3280, were altered by the application of nitrogen doses via subsurface drip fertigation, with significant reductions at the dose of 200 kg N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen fertilization; Full irrigation; Pol% cane; Yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000300209

Critical nitrogen dilution curves and productivity assessments for plant cane
Provedor de dados: 91
Autores: Santana,Augusto C. de A.; Oliveira,Emídio C. A. de; Silva,Vinícius S. G. da; Santos,Renato L. dos; Silva,Magda A. da; Freire,Fernando J.
ABSTRACT Nitrogen is the most limiting nutrient for the development of sugarcane and particularly the use of more productive and demanding varieties, for which the doses of nitrogen fertilization necessary during the plant cane cycle may be underestimated and the critical levels of nitrogen in the leaf may be modified. The objective of this study was to determine the critical nitrogen dilution curve (CNDC) for leaves, evaluate the aboveground dry mass production (DM) and productivity of two varieties fertilized with N in the plant cane cycle. The study was conducted under field conditions, evaluating two sugarcane varieties RB92579 and RB867515, fertilized with seven doses of N (0, 30, 60, 90, 120, 150 and 200 kg ha-1). The varieties and doses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen fertilization; Aboveground dry matter; Variety.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400244

Anthracnose intensity and physical and chemical characteristics of ‘Prata anã’ banana under different nitrogen doses
Provedor de dados: 94
Autores: Freitas,Viviane Alves; Fernandes,Martielle Batista; Mizobutsi,Edson Hiydu; Mizobutsi,Gisele Polete; Ribeiro,Regina Cássia Ferreira; Pegoraro,Rodinei Facco.
Abstract  The balanced supply of nitrogen to fruit trees leads to higher fruit quality and reduced incidence of diseases. The aim of this study was to evaluate anthracnose intensity and the physical and chemical characteristics of ‘Prata Anã’ banana under different nitrogen doses. Regarding anthracnose intensity, N doses of 150, 200, 250, 400 and 600 kg ha-1 were used. The Area Under the Incidence Progress (AUIPC) and Severity Curves (AUSPC) were evaluated. The physical and chemical characteristics were: fruit and pulp mass; soluble solids; starch; total, reducing and non-reducing sugars; coloration and nutrient concentration in peel, evaluated every three days for 15 days. Plants fertilized with N doses of 200, 250 and 400 kg.ha-1 had lower AUIPC values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Colletotrichum musae; Musa spp; Postharvest pathology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000500401

Spad index for diagnosis of nitrogen status in ‘Esmeralda’ peach
Provedor de dados: 94
Autores: Benati,Jorge Atílio; Nava,Gilberto; Mayer,Newton Alex.
Abstract  The objective of this research was to evaluate the technical feasibility of SPAD index in the diagnosis of N status in ‘Esmeralda’ peach. The field trial, with five N rates applied to the soil (0, 40, 80, 120 and 160 kg ha-1 of N as urea form) was conducted in a randomized block design with four replications. During the years 2014, 2015, 2016 and 2017, SPAD readings were carried out with a Minolta SPAD-502 chlorophyll meter, in the leaf middle part, in 40 leaves per plot. The leaf N content determination was performed in CHN-S Elemental Analyzer. SPAD index and leaf N content increased in a linear way in response to increasing N rates applied in soil. There was a positive linear correlation between SPAD index and N concentration in leaves (0.652;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Nitrogen fertilization; Chlorophyll meter; Leaf mineral composition.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452021000103002

Nutritional status, production and fruit quality of west indian cherry fertigated with nitrogen and humic substance
Provedor de dados: 94
Autores: Dias,Dayanne do Nascimento; Sousa,Karla dos Santos Melo de; Lima,Augusto Miguel Nascimento; Cavalcante,Ítalo Herbert Lucena; Santos,Laura Paula Araújo dos; Cunha,Jailson Cavalcante.
Abstract  Information on humic substances (HS) associated with nitrogen fertilization in West Indian cherry is scarce in the literature. The use of soil conditioners, such as HS, can increase the efficiency in the absorption of nutrients, especially N. Therefore, the present study aimed to evaluate, in two production cycles, the fruit quality, yield and nutritional status of West Indian cherry as a function of fertigation with nitrogen (N) and HS in Petrolina-PE, Brazil. The experimental design was in split plots, with treatments distributed in 5 x 2 strips, referring to N doses (50, 75, 100, 125 and 150% of the recommended dose) and HS application (without and with), respectively, with 4 replicates and 3 plants per plot. The N source used was urea (45% N)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighia emarginata; Plant nutrition; Nitrogen fertilization; Humic acid; Production.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000203002

Biomass flow in massai grass fertilized with nitrogen under intermittent stocking grazing with sheep
Provedor de dados: 96
Autores: Lopes,Marcos Neves; Cândido,Magno José Duarte; Pompeu,Roberto Cláudio Fernandes Franco; Silva,Rodrigo Gregório da; Carvalho,Thaíse Cristine Ferreira de; Sombra,Weberte Alan; Morais Neto,Luiz Barreto de; Peixoto,Márcio José Alves.
This study evaluated the biomass flow of massai grass in regrowth subjected to different nitrogen levels (control - no fertilization; 400; 800; and 1200 N kg ha-1year-1) and under rotational stocking with sheep, in a completely randomized design with repeated measures over time. The leaf elongation rate increased with increasing nitrogen levels (N) and the fourth grazing cycle presented a lower value compared with the others. The stem elongation rate responded linearly with increasing levels of N, but it was not influenced by grazing cycles. The senescence rate of leaves remaining before grazing and after grazing were not influenced by the nitrogen fertilization or amended with successive grazing cycles. The phyllochron was influenced only by the nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Nitrogen fertilization; Panicum maximum × Panicum infestum.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100003

Spatial distribution of feces and estimates of nitrogen return by dairy cows on mombasa grass pastures
Provedor de dados: 96
Autores: Silva,Rodrigo Gregório da; Neiva,José Neuman Miranda; Santos,Antonio Clementino dos; Cândido,Magno José Duarte; Sousa,Antonio Luiz Dias; Lopes,Marcos Neves; Silva,Rafael de Oliveira da; Carneiro,Leovegildo Caldas.
The objective of this study was to identify the pattern of deposition of feces by supplemented crossbred dairy cows after the lactation peak on cultivated areas under levels of intensification of the system and its effects on nitrogen cycling, with the aid of geostatistics, in the rainy period. Treatments were composed of two levels of nitrogen fertilization (equivalent to 400 and 800 kg N/ha/year) and two types of animals, according to the daily milk production. Geostatistical and descriptive analyses of the data were conducted. The data presented positive coefficients of skewness and platykurtic kurtosis. For the coefficient of variation, there was elevated alteration, with rest areas showing higher values and paddocks with a higher level of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Nitrogen fertilization; Nutrient cycling; Pasture; Supplementation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000500010

Influence of harvest season, cutting frequency and nitrogen fertilization of mountain meadows on yield, floristic composition and protein content of herbage
Provedor de dados: 96
Autores: Brum,Olívio Bochi; López,Secundino; García,Ricardo; Andrés,Sonia; Calleja,Alfredo.
The aim of the present study was to investigate the influence of cutting frequency, harvest season and nitrogen fertilization on yield and floristic composition of the herbage harvested from a mountain meadow. The meadow was divided into 22 plots, each receiving a different N P K fertilization treatment. The study lasted seven years, and during the first three years (1985-1987) each plot was harvested twice per year (June and September) according to a traditional harvest system, whereas in the years 1989-1991 each plot was harvested three times per year (spring, summer and autumn) following a more intensive harvest system. Nitrogen fertilizer favoured the development of the grasses in spring, thus reducing the proportion of legumes in the two cut harvest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Cutting frequency; Floristic composition; Herbage yield; Nitrogen fertilization.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000400002

Effect of seed inoculation with Azospirillum brasilense and nitrogen fertilization rates on maize plant yield and silage quality
Provedor de dados: 96
Autores: Skonieski,Fernando Reimann; Viégas,Julio; Martin,Thomas Newton; Nörnberg,José Laerte; Meinerz,Gilmar Roberto; Tonin,Tiago João; Bernhard,Priscila; Frata,Marcela Tostes.
ABSTRACT The objective of this study was to determine the effect of Azospirillum brasilense inoculation and different nitrogen (N) rates applied as topdressing on the productivity of a maize crop and the nutritional value of maize silage. Two experiments were conducted in the 2012/2013 and 2013/2014 harvests. Treatments were distributed in a randomized block design in a factorial arrangement, which consisted of two maize hybrids (AS 1572 and Defender) coupled with nitrogen rates (0, 60, 120, 240, and 480 kg ha-1), inoculated or uninoculated with A. brasilense. Inoculated seeds were treated with the A. brasilense strains Ab-V5 and Ab-V6. Inoculation with A. brasilense showed interaction with the hybrids, agricultural years, and nitrogen rates for the maize...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diazotrophic bacteria; Morphological composition; Nitrogen fertilization; Nutritional value; Silage yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000900722

Animal production in Tanzania grass swards fertilized with nitrogen
Provedor de dados: 96
Autores: Canto,Marcos Weber do; Bona Filho,Amadeu; Moraes,Aníbal de; Hoeschl,André Ricardo; Gasparino,Eliane.
Nitrogen (N) at 100, 200, 300, and 400 kg ha-1 was applied to Tanzania grass swards to evaluate the animal response and relationships between sward characteristics and the performance of young Nellore bulls (Bos indicus) under continuous stocking. A completely randomized experimental design was used with two replications between 11 November 2001 and 15 April 2002 when the sward heights were maintained at 60 cm by using different stocking rates. The average daily gain (ADG) (0.73 kg d-1) was not affected by N doses while the number of animal days ha-1 increased linearly from 515 to 1267. On the other hand, the linear increase in the animal yield was 399, 653, 755, and 895 kg ha-1 for N at 100, 200, 300, and 400 kg ha-1, respectively, while the ratio between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal performance; Nitrogen fertilization; Panicum maximum; Tropical grass.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700003

Corn yield for silage and grains in different integrated crop-livestock systems
Provedor de dados: 124
Autores: Pontes,Laíse da Silveira; Tullio,Guilherme Francisco; Martins,Adriana de Souza; Moletta,José Luiz; Porfírio-da-Silva,Vanderley.
Abstract In this study, the objective was to assess the influence of two doses of N (90 and 180 kg N ha-1, added to the winter pastures), two integrated crop-livestock systems (ICLS, with and without trees) and five positions between the tree rows, on the corn (Zea mays L.) quality and productivity, for silage and grain. Adopting the complete randomized block design, the treatments included three replicates. In 2006, following the 14 x 3 m spacing (currently with 158 trees ha-1) the trees were planted in 6 out of the 12 paddocks. While the corn was implemented during summer of 2013/2014, cattle grazing on the annual pasture was done during the prior winter, in both ICLS. Corn for silage was reaped at the R5 phenological stage, whereas for grains it was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroforestry; Eucalyptus dunnii; Grevillea robusta; Nitrogen fertilization; Silage quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200315

Chlorophyll meter reading compared with incomeof maize (Zea mays L.)
Provedor de dados: 22
Autores: Segatto, Cristiane; Conte, Rodrigo; Lajús, Cristiano Reschke; Luz, Gean Lopes da.
Reading the chlorophyll content via chlorophyll meter (SPAD) is a tool AP that provides the farmer subsidy to check the performance of the crops before the nitrogen fertilization. The use of chlorophyll meter enables quickly and easily on the results, an alternative to detect the nutritional status of the plants. This study aimed to evaluate the relationship of the chlorophyll meter readings with the yield of corn. The experiment was conducted in the city of Coronel Freitas / SC season 2014/2015. The ratings for the different corn hybrids and supply levels were performed according to the following factors: Hybrids Simple (HS) with the event VT PRO® (DKB 240 and DKB 290); Development stages (V3-V4, V6, V7 and V10 and Heading stages (R1)). Nitrogen Supply...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; SPAD; Zea mays L.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14009

Sod production and the effects of liquid organo-mineral fertilizers and thickness of sod
Provedor de dados: 63
Autores: Lima,Claudinei Paulo de; Backes,Clarice; Santos,Alessandro José Marques; Bôas,Roberto Lyra Villas; Fernandes,Dirceu Maximino; Godoy,Leandro José Grava de; Oliveira,Mauricio Roberto de.
ABSTRACT: Nitrogen fertilization and an appropriate cutting thickness can result in firmer sod that can be handled in less time with greater turfgrass regrowth during the subsequent cycle. This experiment was conducted on a sod production farm located in Capela do Alto, in the state of Sao Paulo, Brazil. The soil was a dystrophic Rhodic Hapludox (Oxisol) with a medium texture. The experiment had two statistical designs; the initial design was randomized blocks with seven treatments and four replicates. Treatments were five doses of liquid organo-mineral fertilizer (OMF) corresponding to 0, 100, 200, 300 and 400 kg ha−1 of nitrogen (N) with supplementation of phosphorous (P) and potassium (K) as well as two control treatments - one with 300 kg ha–1 of N as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zoysia japonica Steud.; Nitrogen fertilization; Sod quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400346

Residual recovery and yield performance of nitrogen fertilizer applied at sugarcane planting
Provedor de dados: 63
Autores: Franco,Henrique Coutinho Junqueira; Otto,Rafael; Vitti,André Cesar; Faroni,Carlos Eduardo; Oliveira,Emídio Cantídio de Almeida; Fortes,Caio; Ferreira,Danilo Alves; Kölln,Oriel Tiago; Garside,Alan Leslie; Trivelin,Paulo Cesar Ocheuze.
ABSTRACTThe low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum; Urea; Nitrogen fertilization; Isotopic technique.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600528

Nitrogênio em cobertura no feijoeiro cultivado em plantio direto sobre diferentes coberturas vegetais - DOI: 10.4025/actasciagron.v31i1.6637
Provedor de dados: 1
Autores: Silva, Tiago Roque Benetoli da; FAG; Grutka, Gustavo Henrique Hoff; UCDB; Maia, Suelen Cristina Mendonça; UEMS; Freitas, Lucas Barbosa de; UEMS.
O trabalho teve como objetivo avaliar o efeito da aplicação ou não de nitrogênio em cobertura em feijão “das águas”, cultivado após diferentes coberturas vegetais. O experimento foi conduzido em Campo Grande, Estado de Mato Grosso do Sul. O delineamento experimental foi o de blocos casualizados, em esquema de parcelas subdivididas, com quatro repetições. As parcelas foram constituídas por diferentes coberturas vegetais (milho adensado, algodão e trigo) e as subparcelas, pela aplicação ou não de nitrogênio em cobertura (0 e 70 kg ha-1). A semeadura do feijão (Carioca Precoce) foi realizada em setembro de 2005. Foram realizadas as seguintes avaliações: ciclo, população de plantas, componentes da produção, massa de 100 grãos, produtividade, matéria seca na...
Palavras-chave: 5.01.03.04-0 Produção de Mudas Feijão “das águas”; Phaseolus vulgaris L.; Adubação nitrogenada. water season; Phaseolus vulgaris L.; Nitrogen fertilization.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6637

Nitrogênio em cobertura e molibdênio via foliar no feijoeiro irrigado cultivado em solo de cerrado - doi: 10.4025/actasciagron.v33i4.6387
Provedor de dados: 1
Autores: Biscaro, Guilherme Augusto; Universidade Federal da Grande Dourados; Freitas Junior, Nasir Augusto de; Universidade Estadual de Mato Grosso do Sul; Soratto, Rogério Peres; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Kikuti, Hamilton; Universidade Estadual de Mato Grosso do Sul; Goulart Junior, Sidney Antonio Roseiro; Universidade Estadual de Mato Grosso do Sul; Aguirre, Washington Marques; Universidade Estadual de Mato Grosso do Sul.
O nitrogênio é o nutriente exigido em maior quantidade pelo feijoeiro e, mesmo quando suprida adequadamente desse nutriente, a planta de feijão pode ter sua produtividade limitada pela deficiência de molibdênio, pela participação deste no metabolismo do nitrogênio. O objetivo deste trabalho foi avaliar a resposta do feijoeiro (Phaseolus vulgaris L.), cultivar ‘BRS Pontal’, irrigado, à aplicação de nitrogênio em cobertura e molibdênio via foliar, quando cultivado em Neossolo Quartzarênico, no município de Cassilândia, Estado do Mato Grosso do Sul. O delineamento experimental foi o de blocos ao acaso, no esquema fatorial 4 x 2, com quatro repetições. Os tratamentos foram constituídos de quatro doses de nitrogênio (0, 30, 60 e 120 kg ha-1) aplicados em...
Palavras-chave: Produção vegetal Phaseolus vulgaris; Adubação nitrogenada; Adubação foliar; Nutrição mineral; Molibdato de amônio; Ureia Phaseolus vulgaris; Nitrogen fertilization; Leaf application; Mineral nutrition; Ammonium molybdate; Urea.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6387

Doses de nitrogênio e de cama-de-frango na produção da camomila ‘Mandirituba’ - DOI: 10.4025/actasciagron.v31i1.6632
Provedor de dados: 1
Autores: Vieira, Maria do Carmo; UFGD; Zárate, Néstor Antonio Heredia; UFGD; Sanches, Maria Aparecida dos Santos; UFGD; Bendasso, Michelli Cristine Nunes Facholi; UFGD.
O trabalho teve por objetivo avaliar a produção e as características morfológicas dos capítulos florais da camomila ‘Mandirituba’ em função do uso de doses de nitrogênio (3, 18, 30, 42 e 57 kg ha-1), na forma de sulfato de amônio, e de cama-de-frango semidecomposta (1.000, 6.000, 10.000, 14.000 e 19.000 kg ha-1). Os tratamentos foram determinados utilizando-se a matriz experimental Plan Puebla III, resultando nas combinações de N e de cama-de-frango, respectivamente: 18/6.000, 42/6.000, 18/14.000, 42/14.000, 30/10.000, 3/6.000, 57/14.000, 18/1.000 e 42/19.000 kg ha-1. O delineamento experimental utilizado foi de blocos casualizados, com nove tratamentos e quatro repetições. Avaliou-se a altura de plantas e, nos capítulos florais, foram avaliados número,...
Palavras-chave: 5.01.03.04-0 Produção de Mudas Chamomilla recutita (L.) Rauschert; Resíduo orgânico; Adubação nitrogenada. Chamomilla recutita (L.) Rauschert; Organic residue; Nitrogen fertilization.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6632

Resposta do feijoeiro à aplicação de nitrogênio na semeadura e cobertura no sistema plantio direto - DOI: 10.4025/actasciagron.v30i3.3556
Provedor de dados: 1
Autores: Franco, Elias; UEM; Andrade, Carlos Alberto de Bastos; UEM; Scapim, Carlos Alberto; UEM; Freitas, Paulo Sérgio Lourenço de; UEM.
O manejo da adubação nitrogenada no sistema plantio direto é muito importante, e a resposta à sua aplicação depende da dose aplicada e da época de sua aplicação. O objetivo do trabalho foi avaliar as respostas de diferentes doses e métodos de aplicação de nitrogênio para a cultura do feijoeiro em plantio direto. Os tratamentos foram: T1 = 0; T2 = 20 + 30; T3 = 40 + 60; T4 = 60 + 90; T5 = 80 + 120 e T6 = 100 kg ha-1 de N. Em T6, a aplicação de nitrogênio foi todo na semeadura. Nos demais, exceto T1, parte do N (uréia) foi aplicado na semeadura e a outra em cobertura no estádio V4. O delineamento experimental utilizado foram blocos casualizados. Foram avaliados: índice de área foliar, matéria seca de folha população final, os componentes de produção e os...
Palavras-chave: 5.01.00.00-9 Agronomia Phaseolus vulgaris L.; Adubação nitrogenada; Parcelamento do nitrogênio; Teores foliares; Produção de grãos 5.01.03.00-8 Fitotecnia Phaseolus vulgaris L; Nitrogen fertilization; Nitrogen split application; Foliar content; Grains yield.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3556

Technical and economic viability and nutritional quality of mombasa guinea grass silage production
Provedor de dados: 1
Autores: Galindo, Fernando Shintate; Beloni, Tatiane; Buzetti, Salatier; Teixeira Filho, Marcelo Carvalho Minhoto; Dupas, Elisângela; Ludkiewicz, Mariana Gaioto Ziolkowski.
The objective of this study was to evaluate the viability of pasture with high production capacity and the potential for production of silage using different sources and doses of nitrogen (N) by quantifying the productivity of dry matter (DM), some qualitative characteristics, the total cost of production (TC) and total operating cost (TOC) of silage production. The experimental design was randomized block in a factorial scheme with four replications including two sources of nitrogen (urea and ammonium nitrate) and five N doses (0, 50, 100, 150, and 200 kg ha-1 by cutting). The increase in N provided greater DM and crude protein content and reduced the fiber content in neutral detergent. The source of N did not affect the chemical composition, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Chemical analysis; Production cost; Tropical grass; Panicum maximum.; Adubos e adubação.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/36395

Economic viability of production of Nellore heifers on Urochloa brizantha cv. Marandu pastures deferred and fertilized with nitrogen
Provedor de dados: 2
Autores: Aguilar, Poliana Batista de; Teixeira, Fábio Andrade; Silva, Fabiano Ferreira da; Pires, Aureliano José Vieira; Nascimento, Paulo Valter Nunes; Santos, Otanael Oliveira dos.
The objective of this study was to evaluate the effect of different levels of nitrogen on deferred pastures of Urochloa brizantha cv. Marandu, and the implications on the economic viability of production of Nellore heifers. This was a completely randomized design with four treatments (T1 = deferred pasture without nitrogen fertilization; T2 = deferred pasture fertilized with 50 kg N ha-1, T3 = deferred pasture with 100 kg N ha-1, T4 = deferred pasture with 150 kg N ha-1) and four replications (16 fertilized paddocks). First, there were used 48 Nellore heifers, average eight months of age and initial body weight of 178.69 ± 26.67 kg, with three heifers in each paddock, in all treatments, in a continuous grazing system, with variable stocking rate. Only the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Economic analysis; Deferment; Nitrogen fertilization; Profitability; Urea.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28375

Monitoring Some Quality Attributes of Different Wheat Varieties by Infrared Technology
Provedor de dados: 111
Autores: Ibrahim, Ahmed.
There appears to be an acceleration in the growth of non-destructive applications for monitor and detection quality of agricultural products, especially internal quality. These technological developments have greatly increased the demand of consumers to obtain a high-quality product and safe. Near infrared (NIR) spectroscopy one of the most important of these technologies. Accordingly, NIR spectroscopy was used to monitor and quantification the protein, gluten, moisture content, starch in some wheat varieties treated by different nitrogen fertilization rates. Partial least-squares (PLS) analysis was implemented for calibration models. The best PLS model was achieved with NIR region (1000 to 2500 nm) for protein, gluten, starch, and region from 680 to 2500...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural sciences; Agricultural Engineering Near-infrared spectroscopy; Wheat quality; Nitrogen fertilization; Partial least-squares (PLS).
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4600

Response of a fourth ratoon sugarcane crop to nitrogen, silicon, and lime fertilization
Provedor de dados: 115
Autores: Silva,Gilmara Pereira da; Prado,Renato de Mello; Almeida,Thiago Batista Firmato; Nóia,N. Regina de Campos.
Maximum efficiency of nitrogen (N) is attained when fertilizer is accompanied by silicon (Si). Therefore, the objective of this study was to evaluate the chemical attributes of the soil, the nutritional status, the yield of stalks, and the accumulation of N and Si by a fourth ratoon sugarcane (Saccharum sp.) crop, and the influence of N doses in the presence and absence of Si and lime. The study was carried out at the experimental farm of the UNESP Jaboticabal campus, state of São Paulo, Brazil. The experimental design was in a completely randomized block with a 5x2 factorial scheme: five doses of N (0, 40, 80, 120, and 160 kg ha-1), and two corrective materials, silicate and lime; with four replications per treatment. The soil was characterized as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen fertilization; Silicate; Limestone; Stalk production.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000500005

The weibull distribution to describe aboveground biomass of Lolium multiflorum Lam., in relation to rate of nitrogen application
Provedor de dados: 115
Autores: Gorgoso-Varela,José Javier; Oliveira-Prendes,José Alberto; Afif-Khouri,Elías; Palencia,Pedro.
Abstract Characterization of forage biomass in pasture land is complicated by the temporal and spatial variability that result from variation in vegetation patch sizes. These factors along with topography, water location and distribution of fertilizer result in non-uniform grass. The aim of the study was to evaluate the use of the three-parameter Weibull distribution to describe aerial dry matter (DM) production in the first harvest of a mixture of three Italian ryegrass (Lolium multiflorum Lam.) cultivars (the tetraploid ‘Jivet’ and ‘Barspirit’, and the diploid ’Barprisma’) in Asturias (N Spain). The trial was established in a randomized complete block design with three blocks of 100 m2 (20 m x 5 m) and a fertilizer treatment with three levels (0, 40 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Productivity; Nitrogen fertilization; Density function; Moments; Italian ryegrass.
Ano: 2018
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952018000100067

Corn grain yield and 15N-fertilizer recovery as a function of urea sidedress timing
Provedor de dados: 42
Autores: SCHONINGER,EVANDRO L.; VILLALBA,HUGO A. GONZÁLEZ; BENDASSOLLI,JOSÉ ALBERTINO; TRIVELIN,PAULO CESAR O.
Abstract Best fertilizer management practices such as adopting the right N sidedress timing can reduce N losses by volatilization, thus, raising N-fertilizer recovery and grain yield. To evaluate ammonia (N-NH3 ) losses, N-fertilizer recovery and grain yield as a function of urea sidedress timing in corn, a field study was conducted during the 2011-2012 and 2012-2013 growing seasons, adopting a complete randomized block design with four replications. Treatments consisted of urea sidedress timing (140 kg N ha-1) at V4, V6, V8, V10, and V12 growth stages, plus a control without sidedress N. The largest N losses by N-NH3 volatilization occurred when urea was applied at V10 or V12 growth stages, reaching losses of 35 and 41 % of the total applied N. Although...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N isotope; Nitrogen fertilization; Nitrogen volatilization; Zea mays.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703299

Nitrogen topdressing and application ways of fluazifop-p-butyl + fomesafen in weed control and agronomic performance of common bean
Provedor de dados: 42
Autores: SILVA,MATHEUS G.; ARF,ORIVALDO; TEODORO,PAULO E.
ABSTRACT The objective of this study was to investigate the effect of interaction between nitrogen topdressing and different application ways (active ingredients) a.i. fluazifop-p-butyl + fomesafen in weed control and agronomic performance of common bean. The experiment was conducted during winter 2003 in Selvíria/MS. The experimental design used was a randomized block design with four replications in a factorial scheme 2x7. The first factor was composed by the absence or presence of nitrogen topdressing, while the second factor consisted of different application ways of fluazifop-p-butyl + fomesafen. The following variables were measured: leaf N content, dry matter of plants, yield components (number of pods plant-1, number of grains plant-1, the average...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Herbicide mixture; Phaseolus vulgaris L.; Urea.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502301

Biomass components and structure of massai grass fertilized with nitrogen and grazed by sheep
Provedor de dados: 45
Autores: Lopes,M.N.; Cândido,M.J.D.; Pompeu,R.C.F.F.; Silva,R.G.; Carneiro,M.S.S.; Morais Neto,L.B.; Peixoto,M.J.A.; Carvalho,T.C.F.
ABSTRACT To evaluate the biomass components of massai grass subjected to nitrogen (N) fertilization levels (control - 0; 400; 800 and 1200 kg ha-1 year-1 of N) and under rotational stocking with sheep, this study was undertaken using a completely randomized design with measurements repeated in time. A quadratic response was observed reaching maximum values as the levels of nitrogen fertilization increased for green forage biomass, green leaf biomass, green stem biomass (5,172.9; 4,146.3; 1,033.9 kg ha-1 cycle-1, respectively), forage total density (179.1 kg ha-1 cm-1), canopy height (36.8 cm) and live material/dead material ratio (4.0) at levels 896; 934; 797; 879.2; 751.4 and 1,161 kg ha-1 year-1 of N, respectively. For all variables, oscillation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage production; Green leaf biomass; Nitrogen fertilization; Panicum maximum.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000401411

Incidence of stalk rots in corn hybrids influenced by sowing time and nitrogen rates
Provedor de dados: 53
Autores: Berghetti,Juliano; Casa,Ricardo Trezzi; Ferreira,Evandro Zacca; Zanella,Eduardo José; Scheidt,Bruno Tabarelli; Sangoi,Luis.
ABSTRACT Stalk rots compromise the translocation of water and nutrients, affecting grain filling. This study aimed to quantify the incidence of stalk rots in corn hybrids depending on sowing time and nitrogen topdressing rate, and to assess any correlation with grain yield. The experiment was conducted under field conditions in Atalanta, Santa Catarina state, Brazil, using a split-split-plot randomized block design. The hybrids AG 9025 PRO3 (super-early) and 30F53 VYH (early) were sown in the preferential (September 20) and late (December 5) sowing seasons with four nitrogen rates (0, 150, 300, and 450 kg·ha–1). The population density was 75,000 plants·ha–1 andthe nitrogen topdressing was carried out at the V4, V8, and V12 stages. The fungus Colletotrichum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Colletotrichum graminicola; Nitrogen fertilization; Stalk diseases.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300371

Fate of 15N-urea applied to wheat-soybean succession crop
Provedor de dados: 53
Autores: Boaretto,Antonio Enedi; Spolidorio,Eduardo Scarpari; Freitas,José Guilherme de; Trivelin,Paulo Cesar Ocheuze; Muraoka,Takashi; Cantarella,Heitor.
The wheat crop in São Paulo State, Brazil, is fertilized with N, P and K. The rate of applied N (0 to 120 kg.ha-1) depends on the previous grown crop and the irrigation possibility. The response of wheat to rates and time of N application and the fate of N applied to irrigated wheat were studied during two years. Residual N recovery by soybean grown after the wheat was also studied. The maximum grain productivity was obtained with 92 kg.ha-1 of N. The efficiency of 15N-urea utilization ranged from 52% to 85%. The main loss of applied 15N, 5% to 12% occurred as ammonia volatilized from urea applied on soil surface. The N loss by leaching even at the N rate of 135 kg.ha-1, was less than 1% of applied 15N, due to the low amount of rainfall during the wheat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Efficiency; Ammonia; Volatilization.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052004000200011

Performance of maize landrace under no-till as affected by the organic and mineral fertilizers
Provedor de dados: 52
Autores: Caires,Eduardo Fávero; Joris,Helio Antonio Wood; Churka,Susana; Zardo Filho,Renato.
The aim of this work was to study the effects of organic and mineral fertilizers at sowing (without fertilizers, organic poultry litter fertilizer on the surface and mineral NK + reactive natural phosphate from Arad and NK + triple superphosphate in the furrow) and topdressing (without fertilizers, organic poultry litter fertilization and urea) on chemical attributes of a no-till Oxisol and nutrition and yield of maize landrace (Zea mays L.), Carioca variety in a field experiment. Results revealed that P content (Mehlich 1 and resin) was increased in the soil surface layer with organic poultry litter fertilizer on the surface at sowing. Mineral fertilizer in the sowing furrow could be replaced by organic fertilizer with poultry litter on the surface, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Reactive natural phosphate; Nitrogen fertilization; Poultry litter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200006

Aspects of nitrogen metabolism in coffee plants
Provedor de dados: 61
Autores: Carelli,Maria Luiza Carvalho; Fahl,Joel Irineu; Ramalho,José D. Cochicho.
Coffee plants are highly N-demanding plants. Despite the importance of N nutrition for the development, acclimation and yield of coffee plants, there are few reports concerning N metabolism in this species. In this review, our intention is to summarize the information available in the literature and to point out the influence of environmental conditions on N assimilation, as well as comment and discuss some apparently contradictory results and raise and enlighten queries about N assimilation in coffee plants.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea; Irradiance level; Nitrate reductase; Nitrogen fertilization; Oxidative stress; Photoinhbition; Photoprotection; Photosynthesis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000100002

Effect of Nitrogen Source on Some Rhizospheric Properties and Persistence of my Corrhizal Fungal Propagules in an Andisol
Provedor de dados: 117
Autores: Cornejo,Pablo; Rubio,Rosa; Borie,Fernando.
Nitrogen fertilization influences plant growth and rhizospheric properties, affecting the functionality and persistence of arbuscular mycorrhizal fungi (AMF). In order to analyze the effect of two N-sources (NH4+ and NO3-) on the persistence of AMF propagules (colonized root, mycelium and spores) and some rhizospheric parameters (pH, P available), a greenhouse experiment was carried out using two wheat (Triticum aestivum L.) cvs. Otto and Metrenco, which were grown in an Andisol. Plant biomass was determined at the dry grain stage (Zadocks 99, 150 days after sowing, DAS), the density of AMF propagules was determined three months later (240 DAS), and pH and available P were determined at both stages. The results showed that N-source and cultivar influenced...
Tipo: Journal article
Palavras-chave: Acidic soils; Available P; Wheat cultivars; Nitrogen fertilization; Rhizospheric pH.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200001

Yield and nitrogen recovery of wheat plants subjected to urea application with or without a urease inhibitor in the absence of irrigation
Provedor de dados: 118
Autores: Espindula,Marcelo C; Campanharo,Marcela; Dias,Jairo R. M; Rocha,Valterley S; Souza,Moacil A. de; Menoncin,Giovana.
The use of urease inhibitors and irrigation are management options to increasing the efficiency of top-dressed urea by reducing NH3 volatilization. The purpose of this study was to evaluate the productive performance and N recovery of 'BRS 254' wheat plants without irrigation after applying urea or urea+NBPT [N-(n-butyl)thiophosphoric triamide] as the top dressing. The experiment was carried out in Viçosa, MG, Brazil, between May and September of 2008 using a complete randomized block design with a 2×6+1 factorial arrangement of the following treatments: 1) urea or urea+NBPT, 2) six periods without irrigation (0, 48, 96, 144, 192 or 240 h after applying the top-dressing fertilizer), and 3) a control without N; there were four replications. The data were...
Tipo: Journal article
Palavras-chave: Triticum aestivum; Nitrogen fertilization; Nitrogen recovery; Volatilization of NH3.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200014

Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil
Provedor de dados: 65
Autores: Pinto,Daniele Gutterres; Fontana,Denise Cybis; Dalmago,Genei Antonio; Cunha,Gilberto Rocca da; Fochesato,Elizandro; Vicari,Matheus Boni; Gouvêa,Jorge Alberto de; Santi,Anderson.
ABSTRACT: The objective of this study was to characterize the variability of spectral reflectance and temporal profiles of vegetation indices associated with nitrogen fertilization, crop cycle periods, and weather conditions of the growing season in canola canopies in southern Brazil. An experiment was carried out during the 2013 and 2014 canola growing seasons at EMBRAPA Trigo, Passo Fundo, state of Rio Grande do Sul, Brazil. The experiment was conducted in a randomized block design with four replications. Five doses of nitrogen top dressing were used as treatments: 10, 20, 40, 80, and 160kg ha-1. Measurements were obtained with the spectroradiometer positioned above the canopy, to construct spectral reflectance curves for canola and establish temporal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spectroradiometry; Nitrogen fertilization; Brassica napus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100200

Combination of inoculation methods of Azospirilum brasilense with broadcasting of nitrogen fertilizer increases corn yield
Provedor de dados: 65
Autores: Müller,Tânia Maria; Sandini,Itacir Eloi; Rodrigues,João Domingos; Novakowiski,Jaqueline Huzar; Basi,Simone; Kaminski,Tatyanna Hyczy.
Nitrogen (N) is the most limiting nutrient for corn production. Thereby, the goal of the paper was to evaluate inoculation methods of Azospirillum brasilense in order to partially supply N required by the crop. The experiment was carried out in Guarapuava, PR, Brasil, in 2011/2012 growing season. Randomized blocks with factorial 3 inoculation methods (seed treatment, planting furrow and non-inoculated control) x 5 doses of nitrogen (0, 75, 150, 225 and 300kg ha-1) x 8 replications was used as the experimental design. Leaf are index, foliar nitrogen content, total chlorophyll, grains per ear and yield were evaluated. There was significant interaction between inoculation methods and nitrogen fertilization to leaf area index, but not for yield. Inoculation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Diazotrophic bacteria; Seed treatment; Planting furrow.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000200210

Soil solution and plant nitrogen on irrigated rice under controlled release nitrogen fertilizers
Provedor de dados: 65
Autores: Veçozzi,Thais Antolini; Sousa,Rogério Oliveira de; Scivittaro,Walkyria Bueno; Weinert,Cristiano; Tarrillo,Victor Raul Cieza.
ABSTRACT: A study was conducted to evaluate the solubilization and nitrogen (N) use efficiency (NUE) of controlled release nitrogen fertilizers in irrigated rice, compared to urea. It was developed under semi-controlled conditions, including five treatments: Control, Splitted Urea (pre-sowing and topdressing), Pre-sowing urea, and Polymer Coated Urea (PCU) with 60-day and 90-day release. PCUs did not maintain high NH4 + and NO3 - levels in solution over a longer period than urea. NUE of PCUs was similar to uncoated urea, not increasing nutrient release in irrigated rice field.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Polymer coated urea; Efficiency; Flooded soil.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000100251

Spacial distribution of fertigated coffee root system
Provedor de dados: 64
Autores: Vicente,Marcelo Rossi; Mantovani,Everardo Chartuni; Fernandes,André Luís Teixeira; Neves,Júlio César Lima; Figueredo,Edmilson Marques; Delazari,Fábio Teixeira.
ABSTRACT The development of coffee plant root system changes when subjected to drip irrigation and fertigation. This work aimed to evaluate the effects of different levels of fertigation on the development of coffee root system by drip irrigation in western Bahia. The experiment was carried out with Catuaí Vermelho IAC 144 coffee plants, of about 3.5 years of age, in the “Café do Rio Branco” farm, located in Barreiras - BA, and consisted of a complete randomized blocks design with 3 replicates. Treatments consisted of three levels of nitrogen and potassium fertilization (900/800, 600/500 and 300/250 kg ha-1 year-1 N and K2O), weekly distributed, by means of fertigation, throughout the process. After the fourth harvest, coffee root system was evaluated, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Irrigation; Nitrogen fertilization; Potassium fertilization.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000100072