Pikovskaya O. Changes of productivity of chernozem ordinary under influence of soilconservation technologies of cultivation in the Northen Steppe of Ukraine

Object of research are the various parameters of ordinary moder-ately humusified moderatelydeep chernozem's soil fertility (their changes by the impact of the various technologies of crop produc-tion) and productivity of spring barley, maize for sillage and winter wheat. Aim of thesis are to establush the changes of ordinary cher-nozem fertility and yield of crops composing a crop rotation se-quence under the impact of soil-conservation of production. Meth-ods of reseach include field experiment, laboratory analyses and statistical procedures. Novelty of obtained reseach: for the first time for the Northen Steppe of Ukraine is has been formed that the em-ployment of minimum and zero tillage the bulk density of the soil remained within optimum rangeand the indices of soil aggregate composition improved. Conservation tillage technologies increased the stoks of productive moisture and the contents of available phos-phorus and exchangeable potassium in soil. The cycles of macro-elements in spring barleyflots were investigated for conventional, conservation and zero (direct planting) systems of. It was shown that conservation tillage system caused an increase in nutrient cycling by 42 kh/ha compared with conventional technology. Research results are being emplicate in agricultural enterprises. Field of application: agriculture/