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Registros recuperados: 22
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15N uptake fom manure and fertilizer sources by three consecutive crops under controlled conditions Rev. Bras. Ciênc. Solo
Garza,Héctor Mario Quiroga; Delgado,Jorge A.; Wong,José Antonio Cueto; Lindemann,William C..
There are several regions of the world where soil N analysis and/or N budgets are not used to determine how much N to apply, resulting in higher than needed N inputs, especially when manure is used. One such region is the North Central "La Comarca Lagunera", one of the most important dairy production areas of Mexico. We conducted a unique controlled greenhouse study using 15N fertilizer and 15N isotopic-labeled manure that was labeled under local conditions to monitor N cycling and recovery under higher N inputs. The manure-N treatment was applied only once and was incorporated in the soil before planting the first forage crop at an equivalent rate of 30, 60 and 120 Mg ha-1 dry manure. The 15N treatments were equivalent to 120 and 240 kg ha-1 (NH4)2SO4-N...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Denitrification; Nitrogen use efficiency; Annual ryegrass; Salinity; Sudangrass.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500018
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A low-cost approach for Chlorella Sorokiniana production through combined use of urea, ammonia and nitrate based fertilizers. Repositório Alice
RIBEIRO, D. M.; RONCARATTI, L. F.; POSSA, G. C.; GARCIA, L. C.; JUNGMANN, L.; WILLIAMS, T. C. R.; BRASIL, B. dos S. A. F..
bitstream/item/207670/1/LETICIA19302440-main.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Nitrogen use efficiency; Culture medium; Automated photobioreactors; Microalgae; Predator control.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117465
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Acúmulo de forragem em pastos de Brachiaria decumbens adubados com nitrogênio. Repositório Alice
FAGUNDES, J.L.; FONSECA, D.M. da; GOMIDE, J.A.; NASCIMENTO JUNIOR, D. do; VITOR, C.M.T.; MORAIS, R.V. de; MISTURA, C.; REIS, G. da C.; MARTUSCELLO, J.A..
A dinâmica de crescimento de plantas forrageiras tem sido foco de estudo nos últimos anos, visando aprimorar o conhecimento do processo de produção de forragem em pastagens. O objetivo deste trabalho foi avaliar o acúmulo de forragem em pastos de Brachiaria decumbens Stapf. adubados com nitrogênio e submetidos a uma mesma intensidade de pastejo. Os tratamentos consistiram de 75, 150, 225 e 300 kg ha-1 ano-1 de N, aplicados antes do início das avaliações experimentais, as quais foram realizadas durante as estações de verão, outono, inverno e primavera de 2002. O delineamento experimental utilizado foi o de blocos completos casualizados com duas repetições. O capim-braquiária apresentou incremento de produção de matéria seca proporcional às doses de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Adubação nitrogenada; Capim-braquiária; Eficiência de utilização de nitrogênio; Forragem; Pastejo; Nitrogen fertilization; Brachiaria grass; Nitrogen use efficiency; Forage; Grazing.
Ano: 2005 URL: http://www.alice.cnptia.embrapa.br/handle/doc/113974
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Criteria for topdressing nitrogen application to common bean using chlorophyll meter PAB
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
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Economics of Pre-Plant, Topdress, and Variable Rate Nitrogen Application in Winter Wheat AgEcon
Boyer, Christopher N.; Brorsen, B. Wade; Solie, John B.; Arnall, D. Brian; Raun, William R..
Past research about the efficiency of nitrogen application in winter wheat (Triticum aestivum L.) based on source and timing has produced inconsistent results. The majority of the literature used data from few locations over short time periods. This study used a unique data set of yields and nitrogen quantities from 2002-2009 at ten different locations in Oklahoma, USA. The objective of this research was to determine wheat yield response for granular pre-plant, uniform foliar topdress, and variable rate foliar topdress. Topdress liquid nitrogen had a 19% higher NUE than pre-plant urea, and was the most profitable source of nitrogen.
Tipo: Conference Paper or Presentation Palavras-chave: Linear stochastic plateau; Nitrogen use efficiency; Profitability; Wheat; Crop Production/Industries.
Ano: 2010 URL: http://purl.umn.edu/61153
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Efeito do fraccionamento da fertilização azotada na cultura da batata IPB - Escola Superior Agrária
Rodrigues, M.A.; Coutinho, João; Martins, Fernando.
Durante os anos de 1996 a 1998 estudou-se o efeito do fraccionamento da aplicação de azoto na cultura da batata (cv. Desirée). Os ensaios decorreram em Bragança num Cambissolo êutrico. Foram usadas 7 modalidades de fertilização com as seguintes doses de N (fundo + cobertura). 0+0; 200+0; 0÷200; 100÷100; 100+o; 0+100; e 50+50 kg N ha na forma de ureia. Todas as modalidades fertilizadas apresentaram produções unitárias significativamente superiores à modalidade testemunha. Nas modalidades mais produtivas ultrapassaram-se Os 50 Mg ha de tubérculos de calibre comercial.
Tipo: Article Palavras-chave: Solanum tuberosum; Phenology; Nitrogen use efficiency; Tuber quality.
Ano: 2001 URL: http://hdl.handle.net/10198/3205
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Effect of fertilization with fluid swine slurry on production and nutritive value of Tifton 85 R. Bras. Zootec.
Vielmo,Hernan; Bona Filho,Amadeu; Soares,André Brugnara; Assmann,Tangriani Simioni; Adami,Paulo Fernando.
The objective of this study was to evaluate the effect of different doses of liquid swine slurry on dry matter accumulation rate and nutritive values (crude proten and neutral detergent fiber) of Tifton 85 grass pasture cultivated in southwestern Paraná from October 2005 to March 2006. It was used a complete random experimental design in a 4 x 4 factorial scheme composed of four doses of swine slurry in the plots (0, 80, 160 and 320 m³/ha) and four consecutive cuts in the subplots of the pasture. It was carried out two applications, one in the beginning of the experiment and other after 80 days. Cuts were performed every time pasture height was 40 cm. There was a dose versus cut interaction for all variables. Swine slurry promoted increase on dry matter...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cynodon spp; Crude protein; Dry matter production; Neutral detergent fiber; Nitrogen recovery; Nitrogen use efficiency.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100009
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Effects of Nitrogen on Productivity, Grain Quality, and Optimal Nitrogen Rates in Winter Wheat cv. Kumpa-INIA in Andisols of Southern Chile Chilean J. Agric. Res.
Campillo,Ricardo; Jobet,Claudio; Undurraga,Pablo.
Nitrogen is one of the main inputs of the winter wheat crop (Triticum aestivum L.) in southern Chile. Nitrogen efficient management is basic to optimizing its utilization while decreasing pollution risks and operational costs. Crop response and N use efficiency (NUE, defined as the ratio of yield to mineral N supply, regardless of source) are important for evaluating N requirements of winter wheat, and reaching maximum and economic yields. The objective of this study was to determine the effect of N rate on grain yield, calculate the N rate that maximizes yield, and estimate the optimal grain yield rate and quality of high-yielding winter wheat cv. Kumpa-INIA. Five annual N rates were evaluated in a randomized complete block design during two successive...
Tipo: Journal article Palavras-chave: Nitrogen level; Nitrogen use efficiency; Andisols.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100013
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Establishing a Baseline for Nitrogen Policy Assessment AgEcon
Livingston, Michael J.; Ribaudo, Marc.
Tipo: Conference Paper or Presentation Palavras-chave: Nitrogen; Nitrogen use efficiency; Nitrogen management; Environmental Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/60925
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Evaluation of fertilization with uncoated urea and 3,4-dimethylpyrazole phosphate (DMPP)-coated urea on nitrogen leaching and rose (Rosa spp.) yield Chilean J. Agric. Res.
García-Castro,Alexandra; Restrepo-Díaz,Hermann.
The negative impact of N over-fertilization has acquired importance in rose (Rosa spp.) growers in Colombia. The nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) has been considered a valuable alternative to diminish the N losses by leaching and to enable more efficient N use efficiency in crops. The objective of the present work was to study the effect of DMPP on the mineral N (NH4+- N and NO3--N) content in soil and water leaching, and physiological characteristics of rose plants. A greenhouse experiment was performed for 10 wk. Four-year-old 'Charlotte' rose cultivars grafted on 'Natal Briar' were grown in soil and fertirrigated daily with a complete nutrient solution containing 170 mg N L-1. Two N fertilizers (uncoated urea [UA], and urea...
Tipo: Journal article Palavras-chave: Chlorophyll fluorescence; Leaf nitrogen concentration; Nitrate leaching; Nitrogen use efficiency.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200011
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Modificação das características agrometeorológicas do sorgo pela adubação azotada IPB - Escola Superior Agrária
Costa, Luís de Sousa.
O presente estudo pretende contribuir para a avaliação da influência de diferentes níveis de adubação azotada nas características agrometeorológicas de desenvolvimento e crescimento do sorgo forrageiro de regadio, nas condições edafo-climáticas do Nordeste Transmontano. Analisou-se o efeito de quatro níveis de azoto no solo na forma como o crescimento e desenvolvimento do sorgo respondem à temperatura e à radiação solar, nomeadamente em termos de crescimento em altura, evolução do número de folhas, índice de área foliar, produção de biomassa, e extracção de azoto. Esta avaliação é feita em termos dos tempos térmicos de desenvolvimento, da eficiência de utilização da radiação para a produção de matéria seca e da eficiência de utilização do azoto. O estudo...
Tipo: DoctoralThesis Palavras-chave: Sorgo; Azoto; Temperatura; Radiação; Germinação; Área foliar; Produtividade; Intercepção da radiação; Eficiência de utilização da radiação; Eficiência de utilização do azoto; Sorghum; Nitrogen; Temperature; Radiation; Germination; Leaf area; Yield; Radiation interception; Radiation use efficiency; Nitrogen use efficiency.
Ano: 2009 URL: http://hdl.handle.net/10198/1197
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Monitoramento do nitrogênio na planta e no solo para predição da adubação nitrogenada em milho. Repositório Alice
RAMBO, L.; SILVA, P.R.F. da; STRIEDER, M.L.; SANGOI, L.; BAYER, C.; ARGENTA, G..
O objetivo deste trabalho foi comparar o monitoramento do teor de N na planta com base no índice do teor relativo crítico de clorofila na folha (TRCC) e no índice de suficiência (IS), determinados pelo clorofilômetro, e avaliar a integração de características de planta e de solo no monitoramento de N no sistema solo-planta em milho. Foram conduzidos dois experimentos em Eldorado do Sul, RS. Os tratamentos foram sistemas de manejo de N, que diferiram quanto à época, dose e critério para decidir pela aplicação de N (com monitoramento e sem monitoramento). Nos sistemas monitorados, o TRCC e o IS foram usados para indicar a época de aplicação de N em cobertura e testou-se o monitoramento integrado, usando o TRCC e o teor de nitrato no solo. O rendimento e os...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Época de aplicação; Rendimento de grãos; Eficiência de uso de nitrogênio; Clorofilômetro; Application time; Grain yield; Nitrogen use efficiency; Chlorophyll meter.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/123970
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Natural selection for efficiency in the use of nitrogen in common bean identified by analysis of microsatellites and grain yield Electron. J. Biotechnol.
Leite,Monik Evelin; Lima,Igor Almeida; Pereira,Dyanna Rangel; Santos,João Bosco dos.
This study was carried out in order to verify whether natural selection acts on segregating common bean populations grown in the presence and absence of N, and to verify that natural selection affects the frequency of microsatellite alleles specifically, and in order to identify those that can assist in selection. Four populations from the crosses Ouro Negro x CI-107 and VC-5 x IAPAR-81 were carried forward in bulk to F8 at both levels of N. Ouro Negro and VC-5 are considered stress tolerant to nitrogen and IAPAR-81 and CI-107 responsive. One hundred progenies were obtained from each cross and grown in the presence and absence of N. DNA was extracted from 400 progenies, of which 194 were evaluated in the rainy season and 79 in the winter crop for grain...
Tipo: Journal article Palavras-chave: Adaptation; Nitrogen use efficiency; Phaseolus vulgaris; SSR markers.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600005
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Nitrogen availability, leaf life span and nitrogen conservation mechanisms in leaves of tropical trees Scientia Agricola
Corte,Guilherme Nascimento; Macchiaverni,Patrícia; Fabbro,Inácio Maria Dal; Haddad,Claudia Regina Baptista.
Evergreen species of temperate regions are dominant in low-nutrient soils. This feature is attributed to more efficient mechanisms of nutrient economy. Nevertheless, the cashew (Anacardium occidentale- Anacardiaceae), a deciduous species, is native to regions in Brazil with sandy soil, whilst the annatto (Bixa orellana- Bixaceae), classified as an evergreen species native to tropical America, grows spontaneously in regions with more humid soils. Evergreens contain robust leaves that can resist adverse conditions for longer. The physical aspects of the leaves and mechanisms of nutrient economy between the two species were compared, in order to verify whether the deciduous species had more efficient mechanisms that might explain its occurrence in regions of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf deciduity; Nitrogen resorption proficiency; Nitrogen use efficiency; Leaf rupture strain.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600014
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NITROGEN SOIL BUDGETS IN CONTRASTING DAIRY GRAZING SYSTEMS OF SOUTHERN CHILE, A SHORT-TERM STUDY R.C. Suelo Nutr. Veg.
Núñez,R.P; Demanet,R; Alfaro,M; Mora,M.L.
In recent years, the intensification of livestock production in Southern Chile has resulted in a high potential for environmental damage through nitrogen (N) losses, creating the need for the evaluation of N flows from these systems. The aim of the research was to determine N budgets and N use efficiency in two grazing systems in Southern Chile. For this, inputs and outputs were measured during one year on two grazing systems (heavy grazing, HG; and light grazing, LG). Also, a control treatment with no grazing (C) was considered. The annual N soil budget was determined by the difference between all N inputs (£ inputs) and all N outputs (X outputs). The results of the experiment indicate that HG treatments received the biggest N input (427, 359 and 288 kg N...
Tipo: Journal article Palavras-chave: Nitrogen budgets; Grazing; Nitrogen use efficiency; Nitrogen losses; Pasture.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200008
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Palisadegrass effects on N fertilizer dynamic in intercropping systems with corn Anais da ABC (AABC)
ALMEIDA,RODRIGO E.M. DE; OLIVEIRA,SILAS M. DE; LAGO,BRUNO C.; P. JUNIOR,CLOVIS; TRIVELIN,PAULO C.O.; FAVARIN,JOSÉ L..
ABSTRACT Corn grain yield, nitrogen (N) fertilizer efficiency and distribution to corn alone and three forms of corn and palisadegrass (Urochloa spp.) intercropping implantation was investigated. A field experiment with 15N labeling fertilizer was performed in randomized block design. No form of palisadegrass intercropping implantation affected corn grain yield, total N accumulation and N use efficiency (NUE), which were 8.7 t ha-1, 205 kg ha-1 and 37% respectively. The palisadegrass produced on average 1.9 t of dry mass, absorbing a maximum of 6 kg ha-1 or 5.5% of N fertilizer during corn growing. Furthermore, the palisadegrass did not affect N fertilizer distribution in soil-plant system, in which 28.2% was recovered in the soil and 40.4% in the plants...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 15N isotope; Crop-livestock integration; Nitrogen use efficiency; No-tillage; Urochloa spp.; Zea mays..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401917
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Selection of maize top-crosses for different nitrogen levels through specific combining ability Bragantia
Heinz,Rafael; Ribeiro,Larissa Pereira; Gonçalves,Manoel Carlos; Bhering,Leonardo Lopes; Teodoro,Paulo Eduardo.
ABSTRACT An alternative to increase yield without raising the production costs and minimizing the dependence of agricultural inputs is the development of maize genotypes presenting high nitrogen (N) use efficiency under low N level conditions. Thus, the objective of this study was to estimate the specific combining ability of maize top-crosses under high and low nitrogen (N) conditions and to select high-yielding hybrids for both conditions. The grain yield of 110 top-cross hybrids was evaluated in 2012 in two locations in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual top-cross analyses. Specific combining ability (SCA) of the hybrids and their interaction with N levels was estimated for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays L.; Diallel; Hybrid combination; Nitrogen use efficiency.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200208
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The Value of Regional Annual Nitrogen Needs Information for Wheat Producers in Oklahoma AgEcon
Roberts, David C.; Brorsen, B. Wade; Raun, William R.; Solie, John B..
Crop producers are increasingly interested in reducing nitrogen use without sacrificing yield. Technology is available for precise application at the sub-field level, but adoption has been sluggish. This paper estimates the relative profitability of a field level annual predictor of mid-season N requirements and a regional predictor of the same.
Tipo: Conference Paper or Presentation Palavras-chave: Nitrogen seeds; Nitrogen use efficiency; Precision agriculture; Wheat; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008 URL: http://purl.umn.edu/6734
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Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system PAB
Gava,Glauber José de Castro; Trivelin,Paulo Cesar Ocheuze; Vitti,André Cesar; Oliveira,Mauro Wagner de.
The objectives of this study were to evaluate nitrogen utilization by sugarcane ratoon from two sources, applied urea and sugarcane straw covering soil surface (trash blanket), besides the recovery of N from both sources in the soil-plant system. The following treatments were established in a randomized block design with four replicates: T1, vinasse-urea (100 kg ha-1 of urea-N) mixture applied on the total area of the soil covered with cane trash labeled with 15N; T2, vinasse-urea mixture (urea labeled with 15N; 100 kg ha-1 of urea-N) applied on the total area of the soil covered with non-labeled sugarcane trash; and T3, urea-15N (100 kg ha-1 of urea-N) applied in furrows at both sides of cane rows, with previous surface application of vinasse, onto soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: N recovery; Fertilizer-15N; Crop residue; Mineralization; Nitrogen use efficiency.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000700010
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Yield, chemical composition, and efficiency of use of nitrogen by Marandu grass R. Bras. Zootec.
Oliveira,Tadeu Silva de; Leonel,Fernando de Paula; Pereira,José Carlos; Silva,Cássio José da; Baffa,Danielle Ferreira; Zervoudakis,Joanis Tilemahos.
The objective of this study was to evaluate the effect of five nitrogen doses on the productive and quality characteristics and the use efficiency of Brachiaria brizanthacv. Marandu grass. The treatments consisted of four doses of nitrogen (0, 60, 120, 180 and 240 kg ha-1), distributed through a completely randomized design with four replicates. Samples of the material were collected to analyze productivity variables, concentrations of neutral detergent fiber, crude protein and neutral detergent insoluble nitrogen, and in vitro dry matter digestibility. The nitrogen use efficiency, recovery of the applied nitrogen (RAN) and agronomic efficiency of the applied nitrogen (AE) were calculated. Dry mass production increased by 1,624.67 (kg/ha) as the nitrogen...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrogen use efficiency; Nutritional characteristics; Urea.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000800440
Registros recuperados: 22
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