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LEAF AREA AND GRAIN YIELD OF MAIZE HYBRIDS AT DIFFERENT PLANT POPULATIONS

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Author(s): LUÍS SANGOI | AMAURI SCHMITT | CLAITSON GUSTAVO ZANIN

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

Volume: 6;
Issue: 3;
Start page: 263;
Date: 2007;
Original page

Keywords: Zea mays | cultivar | senescence | plant density

ABSTRACT
The slower leaf senescence during the reproductive growth period may be a positive physiological trait to enhance maize tolerance to crowding. This experiment was carried out aiming to evaluate the effect of plant population increase on leaf area and grain yield of maize hybrids. The trial was set in Lages, SC, in a randomized split-plot block design. Two hybrids were evaluated in the main plots: Ag 303 and Speed. Each hybrid was evaluated at five plant populations in the split-plots: 25,000, 50,000, 75,000, 100,000 and 125,000 pl ha-1. Five leaf area evaluations were performed at the silking stage and 14, 28, 42 and 56 days afterwards. Grain yield of Speed was higher and more responsive to the increase in plant population than the productivity of Ag 303. The increment in plant population reduced leaf area of both hybrids. The Speed’s leaf area was always higher than Ag 303’s leaf area during the whole kernel filling period. Speed was more tolerant to crowding and preserved higher leaf area than Ag 303 after silking.
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