adubação nitrogenada para milho com o uso de plantas de cobertura e modos de aplicação de calcário forms of lime application, cover crops and nitrogen rates in maize

Aguinaldo José Freitas Leal; Edson Lazarini; Leandro Rebuá Rodrigues; Luiz Henrique Marcandalli

adubação nitrogenada para milho com o uso de plantas de cobertura e modos de aplicação de calcário forms of lime application, cover crops and nitrogen rates in maize

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ID: 184402

2013

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Abstract

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O sistema plantio direto (SPD) é uma realidade na região dos Cerrados, mas alguns questionamentos persistem nesse tipo de manejo como o modo de realização da calagem e a dose de nitrogênio (N) a ser adotada em cultura comercial, em relação às culturas precedentes. Desse modo, objetivou-se avaliar modos de aplicar o calcário na implantação do SPD e o efeito de culturas de cobertura precedentes sobre a necessidade de adubação nitrogenada da cultura do milho, durante diferentes anos agrícolas. O delineamento experimental utilizado foi de blocos casualizados, em esquema fatorial 5 x 2 (modos de aplicação do calcário x culturas de cobertura) e posterior divisão em três subparcelas, referentes às doses de N (0, 90 e 180 kg ha-1). Foram avaliados quatro modos de aplicação de calcário: incorporado a 0-0,2 m, em out./2001; dose total em superfície aplicada, em out./2001; aplicação de 1/2 da dose, em out./2001, e 1/2, em ago./2002, na superfície; e aplicação de 1/3 da dose recomendada, em mar./2001, + 1/3, em out./2001, e 1/3, em ago./2002, também em superfície. Além de um tratamento testemunha (sem calcário) e duas culturas de cobertura, crotalária e milheto. Os diferentes modos de calagem não alteraram a produtividade de grãos de milho. O cultivo de milho após crotalária apresentou melhor desempenho e menor demanda de adubação nitrogenada, quando comparado ao cultivado após milheto.
The no-tillage (NT) management is widely used in the Cerrado region, but some questions remain unanswered, for example about the need of liming and adequate nitrogen rates for commercial crops when preceded by cover crops. Our objective was to evaluate the effect of precedent cover crops on the maize demand for nitrogen fertilization and forms of liming preceding the adoption of no-tillage management (NT) in different growing seasons. The experiment was arranged in a randomized block factorial design 5 x 2 (liming forms x cover crops) and later divided into three subplots representing the N rates (0, 90 and 180 kg ha-1). Four liming forms were evaluated: lime rate incorporated in the 0 - 0.2 m soil layer in Oct/2001; total dose applied on the surface in Oct/2001; 1/2 amount applied in Oct/2001 and 1/2 in Aug/2002 on the surface; and 1/3 of the recommended dose applied in Mar/2001 + 1/3 in Oct/2001 + 1/3 in Aug/2002, all on the soil surface; plus a control treatment (no lime) and two cover crops (sunn hemp and millet). Maize grain yield was not affected by the different liming forms. Sunn hemp proved more efficient than millet as cover crop preceding maize.

Reference Key	leal2013revistaadubao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors	Aguinaldo José Freitas Leal, Edson Lazarini, Leandro Rebuá Rodrigues, Luiz Henrique Marcandalli Are you one of these authors? Claim your profile
Journal	Revista de saude publica
Year	2013
DOI	DOI not found Searching for DOI...
URL	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200020
Keywords	liming

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Luiz Henrique Marcandalli

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