TY JOUR TI ACCUMULATION OF BIOGENIC ELEMENTS IN THE CROP RESIDUES ON THE AGRICULTURAL CHERNOZYOMS OF KRASNOYARSK FOREST STEPPE KW overground phytomass KW stubble KW roots KW mort mass KW soil KW biogenic elements KW agrolandscape positions JO Bulletin of KSAU AU Zhukova, I.V. AU Zhukov, Z.S. PY 2016 IS PB Krasnoyarsk State Agrarian University