Markova N. The forming of productivity of sunflowers hybrids in the dependence of the sowing terms and the defence of crops from weeds by growing in conditions of southern steppe Ukraine

The object of researches is the processes of growth, development and forming of productivity of hybrids of Sunflowers depending on the terms of sowing and measures of fight against weeds. Purpose of researches - to explore the features of growth, development and forming of productivity of hybrids of Sunflowers depending on the terms of sowing and measures of fight against weeds, to define the factors of rise of productivity and way of decline of power expenditures. Methods of researches - the field, laboratory; statistical; computation-comparative. Results of researches - For a theory: First in the conditions of south Steppe of Ukraine complex researches on the study of influencing of terms of sowing are conducted, measures of fight against weeds on forming of productivity and quality of seeds of hybrids of Sunflowers of different groups of ripeness. Technology of their growing by optimization of the explored factors is improved. The questions of fotosynthetics activity of plants, features of consumption of water, diets and providing by a heat acquired subsequent development. Economic and power efficiency of the improved technology of growing of hybrids of Sunflowers is calculated. For practice: On the basis of the scientific finding and their production verification the optimum parameters of basic agrotechnical measures of growing of the explored hybrids of Sunflowers are recommended. The best variants of researches are recommended passed production verification among the economies of the Nikolaev region, in particular in KАЕ "Sun" the Nikolaev district and LTD. of the "Agroperspektiva" Bratsk's district of the Nikolaev region. The sphere of the use is the agricultural enterprises of south region of Ukraine.