Transformation of carbon, nitrogen and phosphorus compounds in southern chernozem with prolonged use of mineral fertilizers

In the conditions of a long stationary experiment conducted in Saratov region on Southern Chernozem, it was found that for eight rotations six-field grain-pair crop rotation (48 years) variant without fertilization, carbon losses from 0-40 cm layer were highest. Fertilizers N32P16K7 and N38P13K8 per 1 ha area reduced its by 29-32%. When applying N54P17K7, an increase migration organic into underlying 40-100 noted. The total nitrogen content control decreased 8.7% compared to initial data. introduction N15P13K8 contributed preservation compounds humus soil. phosphorus both non-fertilized fertilized soil has changed slightly over 48 years research. Systematic application fertilizers led fraction calcium phosphates.