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EVALUATION OF FROST INCIDENCE IN SOME COMPONENTS OF CORN PRODUCTIVITY (Zea mays L.)

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Author(s): ANGELO CESAR AJALA XIMENES | LUIZ CARLOS FERREIRA DE SOUZA | ANTÔNIO DIAS ROBAINA | MANOEL CARLOS GONÇALVES

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

Volume: 3;
Issue: 2;
Start page: 214;
Date: 2004;
Original page

Keywords: temperature | off-season corn: grain filling | frost

ABSTRACT
With the objective of evaluating the effects of the July 13th to 17th, 2.000 frosts on the production components and on the total protein content in the corn grains, reached by different growth stages, two studies were carried out in Picadinha District, in Dourados, Mato Grosso do Sul. Data were obtained and analyzed considering a complete randomized experimental design, with treatments arranged in 3x5 factorial scheme, corresponding to three places with five collecting per place, resulting in 15 treatments with 4 replications, for the Tork hybrid; whereas for the C 901 hybrid, treatments were arranged in a 2x5 factorial scheme, which corresponded to two locations with five sampling times, resulting in 10 treatments with 4 replications. For comparison among averages, the Duncan test at 5% probability was used. To evaluate the effect of collection periods, the model of polynomial regression was used and it was concluded that plants affected by frosts accumulated dry matter in grains until they reached physiology maturity. Accumulation of dry matter in grains is directly proportional to the damages caused in the leaf area of plants and to the development of grains during frost periods.
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