ABSTRACT
On sod-podzolic medium-loamy soil of medium degree of cultivation (60–80 mg/kg P2O5) under favorable weather conditions, mineral and organomineral fertilizer systems provided a sufficiently high yield of potatoes, winter wheat, and perennial legumes and grasses. During crop rotation, organomineral systems were not inferior in productivity to NPK-equivalent mineral fertilizer systems. In a crop rotation with two fields of perennial legumes and two fields of potatoes, potassium was most effective, followed by phosphorus and nitrogen. On highly cultivated sod-podzolic soil (150–200 mg/ kg P2O5 and more), the yield of winter wheat, potatoes, barley, hay vetch–oat mixture, and, in general, the productivity of crop rotation increased under the influence of nitrogen–potassium fertilizer. The effect of phosphorus fertilizer and manure was negligible.
