Сhanges in soil fertility indices under radiant grasses under different fertilizer systems

Goal. Establish the size of accumulation root mass, symbiotic nitrogen by alfalfa, soil fertility and balance essential nutrients in cultivation alfalfa-cereal mixtures under action lime fertilizers. Methods. Field, laboratory, mathematical statistical. Results. The results research on perennial grasses nitrogen, cellulase activity, erosion resistance changes fertility, as well alfalfa cereal agrophytocenoses influence 2019–2021 Forest-Steppe zone Ukraine dark gray podzolic coarse-grained soil. Conclusions. Under sowing single-species mineral at a dose N90 grass increases dry roots 0.99–1.90 t/ha, productive effect – 0.19–0,64, activity 3-4% anti-erosion meadow duration monolith 1:04–1:42 min: sec, alkaline hydrolyzed 56–307 kg / ha 12–45 phosphorus 87–263 kg/ha potassium are harvested with different types grasses. Nitrogen alfalfa-grass stands without backgrounds positive within 15–28 kg/ha, application - close to neutral, negative (–18 –28 kg/ha). for P45K90 cereals is (24–32 kg/ha), fertilizers (–12 –40 Potassium deficit –56 –241 except where it neutral.