Kozechko V. Optimization methods of cultivation of winter wheat after spring rape in conditions of northern Steppe of Ukraine

Object of research – feature of growth, development and formation of productivity and quality of grain different sorts of winter wheat depending on seeding dates and seeding rates in the conditions of the northern Steppe of Ukraine. The purpose – establishment of features of formation of grain efficiency different sorts of winter wheat depending on seeding dates and seeding rates at cultivation after spring rape. Methods – scientific methods of the analysis and synthesis: field, experiment, hypotheses, laboratory, comparative, modeling, settlement and statistical methods. Results: Influence of seeding dates and seeding rates on productivity and quality of grain of different sorts of winter wheat at cultivation after spring rape. Also the scientific are found features of growth of plants of different sorts of winter wheat depending on seeding dates and seeding rates are reasonable. For soil climatic conditions of the northern Steppe optimum seeding dates and seeding rates of winter wheat at its cultivation after spring rape, the economic assessment of efficiency of its cultivation is carried out. The recommended agroreceptions provide in the conditions of northern the Steppe productivity of grain of winter wheat at the level of 3,7–4,9 tons per hectare. Decrease in productivity at a deviation of seeding dates and seeding rates from the optimum makes from 0,7 to 1,6 tons per hectare. Results of researches are approved and introduced under production conditions farms of the Dnepropetrovsk area on the area of 2,3 thousand hectares. Novelty – for the first time for conditions of the northern Steppe of Ukraine influence of seeding dates and seeding rates on productivity and quality of grain of different sorts of winter wheat at its cultivation after spring rape. Parameters of variability of these indicators in the conditions of transformation of climatic conditions of the region and agroprocessing methods of cultivation are established. Scientifically substantiated the role of individual elements of technology of cultivation. Sector – agriculture.