Nitrate Losses
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Conversion of ammonium to nitrate and abundance of ammonium-oxidizing-microorganism in Tropical soils with nitrification inhibitor
ABSTRACT The use of nitrification inhibitors (NIs; dicyandiamide - DCD) is an alternative to reduce oxidation of ammonium (NH4+-N) to nitrate (NO3–-N) in the soil, reducing NO3–-N losses from fertilization practices. Based on the hypothesis that DCD reduces conversion of NH4+-N to NO3–-N in tropical soils and inhibits ammonia oxidizing microorganisms (
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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2. Organic and Nitrogen Fertilization of Soil under ‘Syrah’ Grapevine: Effects on Soil Chemical Properties and Nitrate Concentration
ABSTRACT Viticulture is an activity of great social and economic importance in the lower-middle region of the São Francisco River valley in northeastern Brazil. In this region, the fertility of soils under vineyards is generally poor. To assess the effects of organic and nitrogen fertilization on chemical properties and nitrate concentrations in an Argissol
Rev. Bras. Ciênc. Solo. Publicado em: 26/04/2016
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3. GESSO AGRÍCOLA E ADUBAÇÃO NITROGENADA NA CULTURA DO MILHO EM SISTEMA PLANTIO DIRETO
A considerably part of the high nitrogen (N) rates applied in corn is not absorbed due root growth restriction by subsoil acidity. Gypsum is able to improve conditions for root growth and lead to greater N uptake efficiency, increasing corn yield. Thus to evaluate the effect of gypsum and N on top dressing on soil chemical attributes, root growth , mineral n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/11/2012
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4. Ammonia losses by volatilization from coastcross pasture fertilized with two nitrogen sources.
Ammonia losses by volatilization from five rates of urea or ammonium nitrate surfacce-applied coastcross pasture, grown on a dark red latosol (Hapludox) in Sao Carlos, SP, Brazil, under tropical altitude climate, werw measured. Volatilized ammonia was absorbes in traps placed on soil surface. The mean losses from urea applied after five sucessive cuttings of
INTERNATIONAL GRASSLAND CONGRESS. Publicado em: 2011
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5. Variação semanal de nitrato no perfil do solo em pastagens de capim Coastcross (Cynodom dactylon cv. Coastcross) intensivamente adubada com nitrogênio, no período das chuvas.
Foram medidos semanalmente os teores de nitrato no perfil do solo, até a camada de 160 cm, em pastagem de capim coastcross recebendo de 100 e 200 kg/ha de N por corte, no período das chuvas, para verificar ocorrência de perdas em profundidade. As maiores variações, de 0 a 81,2 mg/kg de NO ocorreram nas camadas superficiais, ate 40 cm, sendo que em 160 c
REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA. Publicado em: 2011
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6. Carbon and nitrogen stocks and greenhouse gases emissions from sugarcane areas in the Piracicaba region / Estoques de carbono e nitrogênio e emissões de gases do efeito estufa em áreas de cana-de-açúcar na região de Piracicaba
Concentrations of greenhouse gases (GHG), such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), have increased since Industrial Revolution and the agricultural sector significantly contributes to the mentioned increase. Soils are important sinks of carbon (C) and nitrogen (N) and management practices could release part of these pools to the at
Publicado em: 2010
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7. Ammonia loss through volatilization and foliar emission in pasture fertilized with nitrogen sources / Perdas de amônia por volatilização e emissão foliar em pastagem adubada com fontes de nitrogênio
In search of alternatives to measure ammonia (NH3) foliar emission and minimize N-NH3 losses in pasture three research works were accomplished. The two first works aimed at checking whether or not the foam absorber, which was already used to quantify N-NH3 volatilization, is also efficient to measure foliar emission without interfering in nitrogen loss proce
Publicado em: 2009
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8. Perdas de nitrogênio por volatilização e lixiviação provenientes de fertilizantes granulados NK e NS / Nitrogen losses by volatilization and leaching from a granulated fertilizer NK and NS
In order to evaluate the volatilization of N-NH3 and leaching of N from granulated mixtures NK (urea and potassium chloride) and NS (urea and ammonium sulfate) in two soils, two experiments were conducted in a greenhouse with controlled temperature and humidity. The experiment followed a completely randomized design, in factorial 12 x 2 x 2 + control treatme
Publicado em: 2009
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9. Uréia com NBPT em cobertura na cultura do milho
The urea is subject to significant losses of nitrogen by immobilization, mainly by leaching and volatilization, an alternative to minimize these losses is the pretreatment with an inhibitor of urease, the NBPT [N-(n-butyl) thiophosphoric triamide]. The objective was to evaluate, in a commercial field, the effect of coverage on application of different levels
Publicado em: 2009
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10. Nitrogen transformations in soil-plant system after herbicide application / Transformações do nitrogênio no sistema solo-planta após aplicação de herbicidas
Herbicide adoption might modify nitrogen dynamics in agroecossystems and, for consequence, nutrient availability for plants and microorganisms. These modifications may occur because of plant physiologic changes and/or due to herbicide effects on activity and composition of soil microbial community, which has important functions on system N modifications. In
Publicado em: 2009
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11. Perdas nitrogenadas e recuperação aparente de nitrogênio em fontes de adubação de capim elefante / Nitrogen losses and aparent recovery of nitrogen in sources of fertilization of elephant-gass
The efficiency of nitrogen fertilization is one of the key elements to grass production. The knowledge of nitrogen losses within this practice associated with the application of alternative nitrogen sources provide efficient use and flexibility in choosing between nitrogen fertilizers. The objective of this study was to evaluate nitrate leaching, ammonium vo
Publicado em: 2008
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12. Validation of the NUTMON model for the diagnosis of agricultural management: study on two family farms in Rio de Janeiro State. / Validação do modelo NUTMON para o diagnóstico do manejo agrícola: Estudo em duas propriedades familiares do Rio de Janeiro.
This study had the following hypothesis: the agricultural production systems adopted by small farmers brings about nutrient negative balances to soil, which causes the loss of soil fertility and crop yield decline in the time span. The general objective of this study was to validate the NUTMON model of the Food and Agriculture Organization of the United Nati
Publicado em: 2008