TY JOUR TI Effect of various depth methods of fertilizer application on the balance of mobile phosphorus and exchangeable kalium in the cultivation of lupinus angustifolium on the soils of the upper Volga region KW fertilizer system KW minimum tillage KW ploughing KW developed sod-podzolic soils KW leaching type of water regime JO INTERNATIONAL AGRICULTURAL JOURNAL AU Shevchenko, V.A. AU Solovyev, A.M. AU Bondareva, G.I. AU Popova, N.P. PY 2026 IS 0 PB Electronic science