Investigations were carried out with the objective of evaluating the yield stability of corn hybrids in different sowing times, during the autumn-winter season in São Jorge do Ivaí, State of Paraná, Brazil. In the first experiment 12 commercial hybrids were evaluated in randomized complete blocks design, with four replications. In the second, hybrids C 806, FT 9043, AG 5011, C 435 and C 701, selected in the first evaluation, were sown during 15 days interval and evaluated. The joint analysis involving different planting times allowed to conclude that the delayed sowing time resulted in a linear decrease in plant height and a quadratic decrease in leaf area, not affecting, however, the prolificity and the number of leaves per plant. The grain production, influenced by the water precipitation, showed cubic tendency for all hybrids in the trials of different sowing times. The genotype AG 5011 showed higher stability and yield by the classification of Kang and of Lin and Binns methods.
Zea mays L.; sowing time; yield stability
