Rumbakh M. Optimization of technology elements of cultivation of corn hybrids in the conditions of northern subzone of Steppe of Ukraine

The object of study is the formation of corn hybrids yields under the influence of plants density and mineral nutrition level. The purpose is to establish plant density and the mineral nutrition level for new corn hybrids of different maturity groups, to recommend optimal and cost-efficient measures for their cultivation. Field; quantitative, chemical, calculative and comparative; mathematical and statistical methods are used in the research. By the results of research it was developed and recommended improved production technology elements for new corn hybrids growing in the northern steppe subzone of Ukraine to increase grain yield by 0,51-1,21 t/ha. Production testing of research took place in the farms of Dnipropetrovsk region: FE "Peremoga KVI" and LLC "Agrofirm "Novooleksandrivskа", LLC "Dnepr-N" of Verhnedniprovsk district on the total area of 583 hectares. Originality of the research is that the first time in the northern subzone Steppe of Ukraine it was identified reaction of new corn hybrids at changing of environmental conditions; and important technological measures such as the density of plants and the mineral nutrition level. It is economically justified feasibility of the best hybrids growing according to their adaptive features. Sector - agriculture.