TY JOUR TI The effect of long-term use of organic and mineral fertilizers in the agrocenoses of the Komi Republic KW soil KW fodder crop rotation KW organic and mineral fertilizers KW humus KW exchangeablek acidity KW productivity KW starch KW nitrates JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Chebotarev, N.T. AU Brovarova, O.V. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"