Adubação nitrogenada na cultura do milho baseada na medida do clorofilômetro e no índice de suficiência em nitrogênio (ISN) - DOI: 10.4025/actasciagron.v25i2.1985

Leandro José Grava de Godoy; Roberto Lyra Villas Bôas; Hélio Grassi Filho

doi:10.4025/actasciagron.v25i2.1985

Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen

Authors

Leandro José Grava de Godoy UNESP Author
Roberto Lyra Villas Bôas UNESP Author
Hélio Grassi Filho UNESP Author

DOI:

https://doi.org/10.4025/actasciagron.v25i2.1985

Keywords:

Zea mays L., clorofila, SPAD, área de referência

Abstract

An experiment was carried out in Botucatu, state of São Paulo, Brazil, to evaluate the use of chlorophyll meter reading, in nitrogen necessity prediction in corn, Zea mays L., through a nitrogen sufficiency index (NSI). NSI was calculated at four (V⁴), seven (V₇), ten (V₁₀) leaves stage and in tasseling, dividing the measure of the chlorophyll meter reading in the plot by the measure in an area that received a high N rate (200kg N ha^-1). One day before the planting, 0 and 60kg ha^-1 were applied. (kg N ha^-1) were applied in plots that did not receive N: 0; 60 in V₄ and 40 in V₇; 42 in V₄ and 28 in V₇; 20 and 35kg N ha^-1 when the NSI < 0,95. (kg N ha^-1) were applied in plots that received N: 24 in V₄ and 16 in V₇; 20 and 35kg N ha^-1 when NSI < 0,95. The use of NSI allowed to define when N should be applied by starting from seven leaves stage.

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Author Biography

Leandro José Grava de Godoy, UNESP

Possui graduação em Agronomia pela Faculdade de Ciências Agronômicas (1999), mestrado em Agronomia/Agricultura pela Faculdade de Ciências Agronômicas (2002) e doutorado em Agronomia/Agricultura pela Faculdade de Ciências Agronômicas (2005). Atualmente é Professor de Fertilidade do Solo, Nutrição Mineral de Plantas e de Fertilizantes e Corretivos do curso de Agronomia da UNESP - Campus Experimental de Registro . Tem experiência na área de Nutrição e Adubação de Plantas, com ênfase em manejo da adubação nitrogenada Currículo Lattes

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Published

2008-04-23

Issue

Vol. 25 No. 2 (2003)

Section

Agronomy

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How to Cite

Godoy, L. J. G. de, Bôas, R. L. V., & Grassi Filho, H. (2008). Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen. Acta Scientiarum. Agronomy, 25(2), 373-380. https://doi.org/10.4025/actasciagron.v25i2.1985