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NITROGEN RATES IN THE MAIZE CROP IN MEADOW SOIL UNDER SYSTEM OF UNDERGROUND DRAINAGE SYSTEM

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Author(s): MARCOS EMANUEL DA COSTA VELOSO | SERGIO NASCIMENTO DUARTE | DURVAL DOURADO NETO | JARBAS HONÓRIO MIRANDA | EDSON CABRAL DA SILVA | VALDEMÍCIO FERREIRA DE SOUSA

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

Volume: 5;
Issue: 3;
Start page: 382;
Date: 2006;
Original page

Keywords: Zea mays | nitrogen rate | nitrogen fertilizer | urea

ABSTRACT
The maize is one of the most important cultivated and commercialized cereals in the world. Nitrogen (N) is the nutrient needed in larger amount, the one of higher cost, and also the one that influences the most the response in grain productivity. With the purpose of evaluating the N effect on the maize plant components and the grain productivity in a meadow soil under underground drainage system, an experiment was carried out at ESALQ/USP, in Piracicaba county, state of São Paulo, Brazil, in system of implanted drainage. The experimental design was completely randomized blocks, with five treatments (0, 50, 100, 150 and 200 kg ha-1 N) and three replications. The maximum maize grains productivity (10,446 kg ha-1) was estimated with the rate of 180 kg ha-1 N, with an increase of 31.5%, in relation to control. The increment of N fertilizer provided linear increase for some production components (ears per maize plant, mass of 1,000 grains and number of ears per hectare) and quadratic for other (number of grains for ear and number of grains for row). The plant height, maize-cob insertion height and grain productivity had quadratic responses to N rates.
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