Michalenko I. Optimization of sowing terms of corn of different maturity groups in the South Steppe under irrigation

Object of researches - the Technological measures of optimization of growing of hybrids of corn - terms of sowing, terms of providing by moisture. Purpose of researches - establishment of optimum terms of sowing of the different after groups FAO modern hybrids of corn in the conditions of Ingulets' and kahovka's the irrigated arrays and determination of optimum type to the hybrid for concrete agroecologi terms. Methods of researches - the field; visual; measuring-gravimetric; mathematic-statistical; computation-comparative. Results of researches - For a theory: In the conditions of South Steppe the reaction of new home hybrids of corn of different groups of ripeness on the terms of sowing is definite, that include both sverhrannie calendar terms, and over late. It is definite genotype - environment reaction of hybrids on the terms of providing by moisture in different irrigation systems. For practice: On the basis of researches, that are conducted in the conditions of south of Ukraine, finding about forming of productivity of plants of hybrids of corn of different groups of ripeness, which have the important practical value for the producers of commodity corn. The set possibility of adjusting of terms of sowing depending on a type to the hybrid and features of the irrigation system, structures of sowing areas. The sphere of the use is the agricultural enterprises of south of Ukraine.