Shevchenko O. Optimization of the processes of forming of productivity of maize hybrids with different terms of ripening, using herbicides in Ukrainian Nord Steppe

The object is a particularity of forming of maize hybrids agrocenosis by application of herbicides. The purpose is increasing of productivity of hybrids which mature in different time by selection of effective technological combinations of herbicides. The methods are the field, laboratory and laboratory–field experiments. The results are the principles of adaptive selection of maize hybrids depend on hydrothermal conditions and widening of a spectrum of phytotoxic effect of technological herbicides combinations and icreasing of their effectiveness against immunitive weeds to 92–94 per cent. The novelty is a competitive possibility characteristics of the hybrids of different ripeness, determination of factors of productivity and quality of corn, the immunity of culture against herbicides, the principles of forming of phytotoxical spectrum of herbicides against the weeds. The application is 29,6 hectar, increasing of maize productivity is 7,4 centner on hectar.Sphere of use is Agriculture.