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PRODUCTIVITY AND AGRONOMIC EFFICIENCY OF MAIZE AS A FUNCTION OF NITROGEN FERTILIZATION AND SOIL MANAGEMENT

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Author(s): ROGÉRIO FARINELLI | LEANDRO BORGES LEMOS

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

Volume: 9;
Issue: 2;
Start page: 135;
Date: 2010;
Original page

Keywords: doses of N as topdressing | conventional soil tillage | no-tillage | agronomic characteristics | nitrogen use efficiency

ABSTRACT
Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield. The purpose of this work was to evaluate the yield components of maize, grain yield and agronomic efficiency, regarding topdress nitrogen doses, cultivated under conventional soil tillage and no-tillage system at Universidade Estadual Paulista (UNESP), campus of Botucatu, SP, using the black oat/corn succession. The experimental design was a randomized complete blocks in split plot arrangement, with four replications. The plots were represented by the different soil tillage systems (conventional and no-tillage), and the subplots by nitrogen doses applied as topdressing (0, 40, 80, 120 and 160 kg N ha-1). Urea was used as N source. The doses of N promoted increases in leaf N content and grain nitrogen content. Maximum grain yield was obtained with the estimative of 92 kg N ha-1 as topdressing. The agronomic efficiency (kg grain per kg N applied) was reduced by increasing N dose, with the greatest gains in grain production per kg of N applied in the no-tillage system.
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