Características agronômicas envolvidas na adaptação de híbridos de milho em condições de primeira e segunda safra

Abstract

The search for more productive corn hybrids, resistant to the main diseases that affect the crop and adapted to different sowing times, has been the target of breeding programs. The hypothesis of the research is that the sowing times affect the characteristics and productivity of corn by interacting with the environment. Thus, the aim of the research is to identify agronomic characteristics associated with the wide adaptation of corn hybrids in first and second crop conditions, in order to contribute to hybrid selection strategies by corn breeding programs. The experiments were carried out under field conditions in the 2022/23 harvest at the Corteva research station in the municipality of Indianópolis-MG. A randomized block design was used in a factorial scheme with five sowing times and sixteen hybrids, with three replications. height, ear insertion height, flowering, number of days between planting and physiological maturation, leaf length, leaf width, number of green leaves, leaf area index, severity score for Bipolaris maydis, percentage of plants with stunting, shoot dry mass (stem + leaf + ear) of corn, weight of a thousand seeds and grain yield were valued data were submitted to individual and joint analysis of variance, and when differences were observed between the treatments by the F test, the means were grouped by the Scott-Knott test. We conclude that the shoot dry mass and weight of one thousand seeds can be used to identify hybrids with wide adaptation in first and second crop condition.