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NITROGEN CONTENTS, LEAF AREA INDEX AND HARVEST INDEX IN MAIZE AFFECTED BY NITROGEN FERTILIZATION IN WETLAND SOIL

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Author(s): MARCOS EMANUEL DA COSTA VELOSO | SERGIO NASCIMENTO DUARTE | DURVAL DOURADO NETO | EDSON CABRAL DA SILVA | CARLOS RODRIGUES PEREIRA

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 8;
Issue: 1;
Start page: 13;
Date: 2009;
Original page

Keywords: Zea mays | nitrogen rate | urea | drainage

ABSTRACT
Nitrogen (N) is the nutrient absorbed and exported in largest amount, the most expensive, and the element that more influences maize productivity. The objective of this work was to verify the effect of N doses on total N contents in maize leaves at flowering time, and in plant aerial parts and grains, besides leaf area index and harvest index at farinaceous grain stage, in maize cultivated in wetland soil under the underground drainage system. The experiment was carried out at ESALQ/USP, in Piracicaba, São Paulo state, Brazil, using a completely randomized blocks design, with five treatments (0, 50, 100, 150 and 200 kg ha-1 N) and three replications. The increment in N dose caused linear increase in the total N content in leaves at flowering time; and in the total N contents in the plant aerial parts and grains at the farinaceous grain stage. The increase of N rates promoted linear dose-response in leaf area index of the maize simple hybrid P30 P70 but not significantly influenced the harvest index.

Tango Jona
Tangokurs Rapperswil-Jona

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