CONTOUR DIFFERENTIATION OF CHERNOZEMS SOIL FERTILITY OF THE RIGHT BANK OF SARATOV REGION
In article laws of formation at levels (ESS) and (ESA) planimetric structure of basic elements of fertility of soil of an arable land of the Saratov area, factors of a planimetric variation are resulted. Connection of efficiency and quality of a winter wheat is established with levels of the maintenance of elements of fertility of soil. Geographical law of quantitative change humus contours within (ESS) is revealed. On the average, on elementary soil areas chernozem zones the highest factor of a spatial variation is revealed for mobile phosphorus - 54,0 % and nitrate nitrogen - 50,9 %, minimum for (рН) -8,3 %. Factors of a variation for humus and potassium occupy intermediate position and make accordingly 23,8-27,0 %.