CORRELATION OF SUNFLOWER YIELD WITH FERTILITY INDICATORS OF BLACK SOIL TYPICAL UNDER DIFFERENT FERTILIZER SYSTEMS

One of the most important properties soil is its fertility, which formed in process formation and characterized by totality all indicators. Restoration fertility preservation should be a priority task modern agriculture, as it one reserves for increasing production agricultural products. The purpose research was to determine dependence sunflower productivity on physico-chemical agrochemical parameters typical chernozem depending fertilization systems. following methods were used process: field - determination interaction objects with natural agrotechnical factors; laboratory humus content, physicochemical indicators; statistical mathematical conducting dispersion, correlation regression analysis. use organo-mineral system crop rotation contributes improvement their indicators chernozem. highest yield under mineral –2.9 t/ha system, significantly higher than option without fertilizers. Long-term anthropogenic impact chernozems leads trend close nutrition, except nitrogen, where level average (r = 0.41±0.24). Correlation coefficients indicate that pH, sum absorbed bases affect increase content humus, effect 0.41), phosphorus 0.62) potassium 0.65) layer 0-25 cm.