TY JOUR TI ACCUMULATION OF HEAVY METALS BY PULSE CROPS UNDER THE APPLICATION OF BIOLOGICALLY ACTIVE SUBSTANCES IN THE VOLGA REGION FOREST-STEPPE KW soil KW grain KW peas KW soy KW metals KW preparation JO Bulletin Samara State Agricultural Academy AU Trots, N.M. AU Pakhomov, A.A. PY 2020 IS 5 PB Samara State Agrarian University