The productivity of the vetch and oat mix in crop rotation when using various fertilizer systems in the Vologda region

In 2017-2019, it was revealed that fertilizers provide 36 - 51% of the annual crops green mass yield, collection raw protein increases by 1.5 1.6 times. When N12 introduced against background phosphorus and potassium fertilizers, its content corresponded to 12.50%, when N75 introduced, increased 13.6 13.7%. Takeaway for N, P, K with use N 75 P 35 130-160 respectively times, 40 80-90% compared control. The NO3 in amounted 72 86% maximum allowable concentration. doses are 32 34 ton/ha a vetch oat mix more negative balance fertilizer elements investigated.