BIOLOGICALLY FOUNDED OPTIMAL DURATION OF VEGETATIVE PERIOD OF CORN HYBRIDS IN MIDDLE VOLGA REGION ENVIRONMENT
Experimental data show, that maximum grain yield in soil-climatic conditions of steppe Middle Volga region can be received at cultivation of hybrids of early-ripe and middle-early-ripe groups having 52 - 55 days from rising to filaments growth and the period of vegetation - 101-112 days.