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Aplicação tardia de nitrogênio no feijoeiro em sistema de plantio direto

Authors: Soratto, Rogério Peres; Crusciol, Carlos Alexandre Costa; Silva, Laerte Marques da; Lemos, Leandro Borges;

Aplicação tardia de nitrogênio no feijoeiro em sistema de plantio direto

Abstract

A adoção de técnicas que possibilitem a maximização da eficiência do uso de nitrogênio pelo feijoeiro é de extrema importância para aumentar a produtividade e qualidade de grãos, reduzir o custo de produção e evitar contaminação ambiental. O objetivo deste trabalho foi avaliar a resposta do feijoeiro (Phaseolus vulgaris L.) à aplicação de nitrogênio em cobertura nos estádios V4 e no início do R7, em sistema de plantio direto. O delineamento experimental foi em blocos ao acaso, em esquema fatorial 2 x 4, com quatro repetições. Os tratamentos foram constituídos pela aplicação de dois níveis de N (0 e 90 kg ha-1) no estádio V4, combinados com quatro níveis de N (0, 30, 60 e 120 kg ha-1) no início do estádio R7. Quando não foi realizada adubação nitrogenada de cobertura no estádio V4, a aplicação de N no início do estádio R7 aumentou a produtividade de grãos do feijoeiro em sistema de plantio direto. A produtividade máxima de grãos foi obtida com a aplicação exclusiva de 90 kg ha-1 de N no estádio V4, sendo necessárias, para atingir o mesmo nível de produtividade, maiores doses de N quando aplicadas apenas em R7. Quando é realizada aplicação de N em V4, adubações adicionais em R7 não resultam em aumento de produtividade. A aplicação de N em cobertura no estádio V4 foi mais eficiente do que a aplicação em R7, acarretando em maior incremento na produtividade por unidade do nutriente aplicado. A aplicação de N em cobertura, nos estádios V4 e início do R7, proporcionou aumento no teor de proteína nos grãos do feijoeiro.

Country
Brazil
Keywords

proteína, época de aplicação, adubação nitrogenada, nitrogen fertilization, protein, Phaseolus vulgaris, time of application

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    18
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
18
Average
Top 10%
Average
Green
gold