TY JOUR TI DEPENDENCE OF CROP ROTATION PRODUCTIVITY AND ECONOMIC EFFICIENCY ON VARIOUS BASIC TILLAGE SYSTEMS KW crop rotation KW main tillage system KW collection of fodder units per hectare KW economic efficiency KW net income KW level of profitability JO Bulletin of KSAU AU Savenkov, V.P. PY 2023 IS 0 PB Krasnoyarsk State Agrarian University