Evaluation of five corn hybrids (Zea mays, L.) at different maturity stages: 1. Productivity, morphologic traits and correlations

[摘要] This study was conducted to evaluate productivity and morphologic traits of five hybrids of Pioneer corn: P32R21, P30R07, P3041, P30F33 and P30F80 at different maturity stages. The treatments were used in plots of 7 x 8 m in a randomized block design, with four replicates. The samples collected, of corn hybrid, were adopted trying to estimate phases of maturity of the plant (30, 34, 38, 42 and 46% of dry matter [DM]). In the first maturation stage, some parameters (plant height, the ear of the corn insertion height, plant weight, stem diameter, number medium of ears of the corn) were evaluated, at harvest. For each maturation stage, was done separation of stem + sheath, leaf lamina, grain, cob and straw. The hybrid P32R21 and P3041 presented shown weight, diameter stem and plant height. Dry matter (DM) yield, green material, grain, leaf lamina, and stem + sheath, expound t/ha at hybrids were different and presented significance at days after seeding (DAS). The increase the productivity DM verify with the advanced the maturity stage hybrids, correlations positively with increase the production grain (R2 = 64.3%). Too the production DM correlations positively with concentration ear (R2 = 56.0%) and negatively (R2 = -56.7%) with the concentration stem + sheath (in relation a whole plant).

[学科分类] 兽医学

[关键词] corn;dry matter;ear;grain;leaf lamina;stem     IntroduçãoFerreira (1990a) destacou que;para produzir silagem de milho de boa qualidade;várias recomendações técnicas devem ser atendidas;como a colheita do milho no estádio adequado de maturidade