Distribuição do Nitrogênio do Sulfato de Amônio (15N) no sistema solo-planta, em uma sucessão de culturas, sob sistema plantio direto

Fernandes, Flavia Carvalho da Silva; Libardi, Paulo Leonel

doi:10.1590/s0100-06832012000300019

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…Generally, the dry matter content should increase as the fertilizer N dose increases, as reported by several authors (Fernandes;Libardi, 2012;França et al, 2011;Rimski-Korsakov et al, 2012). However, in some cases, when the crop shows rapid growth and the response to N is low, no increase in stubble production may be observed.…”

Section: Agronomic Performance and N Accumulation Of Maizementioning

confidence: 66%

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Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

et al. 2016

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High nitrogen losses by ammonia volatilization are expected when urea is used as the source of N. The use of controlled-release urea and urease inhibitors are possible strategies to reduce such losses and increase nitrogen use efficiency. This study aimed to evaluate nitrogen losses by ammonia volatilization from stabilized, slow and controlled release urea and its absorption by maize grown under no-till in an improved Cerrado soil. Four N sources were used: conventional urea, urea + N-(n-butyl) thiophosphoric triamide (NBPT), urea + Cu and B and urea coated by sulfur + polymers. These N sources were surface applied along the rows using three N doses of 100, 150 and 200 kg ha -1 . No N was added to the control. Data were collected regarding N losses by volatilization, the N contents accumulated in the stubble and grains, and the yields of the stubble and grains. Stabilized urea and slow release urea were efficient for postponing the ammonia volatilization peaks. The urease inhibitors postponed the peaks for up to two days, reducing the accumulated volatilization by 18% when compared with common urea. Polymer sulfur coated urea resulted in a 37% reduction in ammonia volatilization. Increasing the N application rate to 200 kg ha -1 resulted in 16% greater yields and 37% greater N accumulation in the plants relative to the control. However, the stabilized and slow-release urea did not improve the N accumulation or yield. Consequently, the nitrogen use efficiency of maize was not improved relative to the use of conventional urea.Index terms: Nitrogen fertilizers; NH 3 -N losses; polymer sulfur coated urea; urease inhibitors; Zea mays L. RESUMOA aplicação de ureia, frequentemente, gera grandes perdas de N por volatilização e o uso de revestimentos e inibidores de urease, podem reduzir essas perdas. Neste estudo, objetivou-se avaliar as perdas de nitrogênio pela ureia estabilizada e de liberação lenta ou controlada e sua absorção pelo milho cultivado em plantio direto, em solo de Cerrado, com fertilidade construída. Quatro fontes de N foram utilizadas: ureia convencional, ureia + N-(n-butyl)thiophosphoric triamide (NBPT), ureia + Cu + B e ureia revestida por enxofre e polímeros. Essas fontes de N foram aplicadas em superfície nas doses de 100, 150 e 200 kg ha -1 . Não houve aplicação de N no controle. Avaliaram-se as perdas de N por volatilização, o acúmulo de N nos grãos e palhada e produção de grãos e de palhada. A ureia estabilizada e de liberação controlada foi eficiente em atrasar os picos de volatilização de amônia. Os inibidores de urease atrasaram os picos de volatilização em até dois dias, reduzindo a volatilização acumulada em até 18%, quando comparado à ureia comum. A ureia revestida por enxofre e polímeros resultou em uma redução de 37% na volatilização de amônia. O aumento da dose de N até 200 kg ha -1 resultou em aumento de 16% na produtividade e 37% no acúmulo de N em relação ao controle. Entretanto, a ureia estabilizada e de liberação controlada não aumentou o acúmulo de N ou a produtividade...

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Section: Agronomic Performance and N Accumulation Of Maizementioning

confidence: 66%

“…Accumulated values of 35 and 59 kg N ha -1 (mean of two crops) were obtained by Fernandes and Libardi (2012) was applied at sowing, 179 kg N ha -1 (excluding roots) was measured.…”

Section: Agronomic Performance and N Accumulation Of Maizementioning

confidence: 99%

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

et al. 2016

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“…The recommendation of nitrogen fertilization on summer corn coincides with different species that occupy the soil during winter, what may affect the stocks of nitrogen (N) in the soil and nutrient utilization by the plant. According to Fernandes and Libardi (2012), the advancement and consolidation of the direct drilling system in tropical soils with soil re-covering increment N in the soil, what leads to new agricultural recommendations for crops.…”

Section: Introductionmentioning

confidence: 99%

Sources and rates of nitrogen in summer corn under no-tillage on winter cover crops

Werncke¹,

Souza²,

Bassegio³

et al. 2014

Afr. J. Agric. Res.

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Cover crops occupy and protect the soil during winter and also provide nutrients to tropical soils. The aim of this study was to evaluate the effect of sources and levels of nitrogen applied to a summer corn crop cover in succession to cover cropsunder no-tillage. The experimental design consisted of randomized blocks with four replications in a scheme with subdivided plots. The main plot was composed of two crops that preceded corn; common oat (Avena strigosa Schreb.) and forage turnip (Raphanus sativus), and a winter fallow area (weed). The subplot consisted of two nitrogen sources (urea and ammonium sulphate), and the splits of each subplot were constituted by four rates of nitrogen (0, 30, 60 and 120 kg ha-1). The following production components were analyzed: ear diameter, kernel rows per ear, mass of 1000 grains and grain yield. Corn grown after oat presented responses to nitrogen fertilization for mass of 100 grains and hence to grain yield.

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“…According to Fernandes and Libardi (2012), the advance and widespread of the direct drilling system and the re-covering of the soil increase the total stock of N in the soil, resulting in new agricultural recommendations. Cover crops play an important role in the direct drilling system, including protecting the soil from erosion, increasing soil organic matter, improving chemical, physical and biological quality, and promoting carbon sequestration, what allows producers to reduce costs on fertilizers and herbicides for weed control (Carvalho et al, 2011, Rosa et al, 2012Rosolem and Calonego, 2013).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fertilization for summer corn in succession to cover crops under direct drilling system in Western Paran - Brazil

Bassegio¹,

Wernecke²,

Reginaldo³

et al. 2013

Afr. J. Agric. Res.

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The quality of vegetal residues from crops and green manure can influence the mineralization/immobilization rate of nitrogen and the subsequent utilization of this nutrient by the following crops. The aim of this study was to evaluate the effect of nitrogen rates applied to the cover of summer corn, succeeding winter cover crops under direct drilling system. The experimental design consisted of randomized blocks with four replications in a scheme with subdivided plots. The main plot was composed of two crops previous to corn: Common oat (Avena strigosa Schieb), forage turnip (Raphanus sativus) and a fallow area (weed). The subplot consisted of four rates of nitrogen (0, 30, 60 and 120 kg ha-1). The production components analyzed were: Ear diameter, rows of grains/ear, mass of 100 grains and yield. Cover crops did not affect the components of corn production. The corn cultivated in succession to forage turnip showed responses to nitrogen fertilization.

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Distribuição do Nitrogênio do Sulfato de Amônio (15N) no sistema solo-planta, em uma sucessão de culturas, sob sistema plantio direto

Abstract: (1) trabalho apoiado pela faPesP. recebido para publicação em 24 de maio de 2010 e aprovado em 2 de março de 2012.(2) Professora Doutora da universidade estadual de maringá -Campus de umuarama (Pr

Cited by 4 publications

References 17 publications

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

Sources and rates of nitrogen in summer corn under no-tillage on winter cover crops

Nitrogen fertilization for summer corn in succession to cover crops under direct drilling system in Western Paran - Brazil

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