TY JOUR TI Efficiency of application of microfertilizers in chelate form on the productivity of grain sorghum varieties KW sorghum KW variety KW yield KW grain KW biomass KW chelated micro fertilizers KW payback KW profitability KW efficiency JO INTERNATIONAL AGRICULTURAL JOURNAL AU Stepanchenko, D.A. AU Vasilieva, E.V. AU Efremova, I.G. AU Starchak, V.I. AU Semin, D.S. PY 2025 IS 0 PB Electronic science