RODUCTIVITY FACTORS OF CROP ROTATIONS IN THE SOUTHWEST REGION OF THE CENTRAL CHERNOZEMIC ZONE
It has been shown that the application of mineral fertilizers and manure is the major factor increasing the productivity of crop rotations in the southwestern part of the Central Chernozemic zone. Their effect can be enhanced by plowing for row crops and surface tillage for close-growing crops. The grain-fallow-row crop rotation provides the highest yield of grain units, and the grain-grass-row crop rotation gives the highest yield of digestible protein. The grain-row crop rotation occupies an intermediate position. The yields of peas, summer barley and sainfoin depend on weather conditions by 60%, and the yields of winter wheat, sugar beet, and corn for grain and silage by 30%.