TY JOUR TI Evaluation of the effectiveness of adaptive-landscape farming systems on the example of Rogovatovskaya Niva JSC in the Belgorod region KW agrochemical soil monitoring KW potassium KW microelements KW organic matter KW phosphorus KW fertilizers KW yield KW chernozem JO INTERNATIONAL AGRICULTURAL JOURNAL PY 2026 IS 0 PB Electronic science