TY JOUR TI THE CEREAL CROPS BIOMASS PRODUCTIVITY IN THE CASE OF INTRODUCING COMPLEX FERTILIZERS INTO DARK GRAY SOILS KW dark gray soil KW complex fertilizers KW experiment variants KW productivity KW biomass KW morphometric indicators KW increase JO Bulletin of KSAU AU Sorokina, O.A. AU Trufanowa, A.A. PY 2012 IS PB Krasnoyarsk State Agrarian University