TY JOUR TI SOIL CULTIVATION AND PRODUCTIVITY INFLUENCE ON CROPS KW resource-saving KW minimizing KW system of processing of the soil KW system of protection of plants KW chernozyom soils KW weed plants KW productivity of barley KW productivity of wheat KW productive mois-ture KW biopower coefficient JO Bulletin of KSAU AU Mihaylova, Z.I. AU Mihaylov, A.A. AU Vakulenko, O.V. PY 2016 IS PB Krasnoyarsk State Agrarian University