The studies intend to modernize the crop rotations for increasing of soil fertility and quality of produced crops. Perennial grasses and green manure crops were included into rotation at increasing the content of legumes in crop’s structure to reduce the intensity of nitrogen fertilization. The experiments were conducted on 3 six-field crop rotations in 4 replications. Factors such as soil compaction and structure, weed infestation and yielding of crops were studied as affected by different crop rotations. The results showed that the yields varied in particular seasons and depended also on applied forecrops in dry years. The highest, average for 6 years, yield of winter rye in the II crop rotation was 3.8 t/ha (in I and III rotations 3.48 and 3.24 t/ha, respectively). The yields ranged within 3.6-4.1 t/ha for spring wheat, 4.0-4.2 t/ha for barley. The most energy-efficient was II rotation (on-year clover, two-year clover, winter rye, spring wheat, vetch-oat for grain, barley + clover as supplementary crop),where small fertilization rates and low energy inputs (19941 MJ/ha) were applied, while the energy yielded in form of crops was as high as 85218 MJ/ha. In friendly to environment soil cultivation systems the cereal-grass crop rotations should be used at high percentage of legume plants and low mineral fertilization rates.
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