Isaenkov V. The technological measures of growing of parental forms of maize hybrids of different maturity groups in north Steppe.

The object of research - the processes of growth, development and seed formation efficiency inbred lines and simple sterile corn hybrids based on the basic technological measures. Purpose - to develop conditions for the northern steppe of the main elements of parental forms of agricultural grade corn hybrids of different maturity groups and recommend optimal production cultivation. Methods - Field, laboratory, and statistical mathematics. Results - grade farming techniques developed forms of parental corn hybrids to stabilize the production of high quality seeds of hybrids of parental forms. They are sowing in optimal and optimally-later date with the recommended density increases plant standing crop seed 0,08-0,29 t/ha and fertilizer application doses N30P30K30 N60P60K60 or subject-level provision of soil - on 0,06-0,71 and additionally at 0,20-0,63 t/ha. The research results tested in production conditions and used at Erastivska research stations The Institute of Grain Farming NAAS of Ukraine on the area of 50 hectares, the economic effect amounted to 20,25 ths. the whole area. Novelty - in the northern steppe of the first major activities developed grade technology for various forms of parental earliness of hybrids. Defined relationship with the productivity level of seed plants and heating supplies conditions sowing dates. Reaction revealed sterile inbred lines and hybrids to change the environment, the level of important technological background and sowing density. Theoretically grounded and a new approach to determining optimum density of plant standing molds. Sector - agriculture.