TY JOUR TI Development of a method for assessing the state of land fertility based on modeling the productivity of agricultural crops in natural zones of the Altai region KW soil fertility indicators KW crop yield KW natural zones KW modeling KW Random Forest KW ERA5-Land KW NDVI KW SoilGrids KW Altai Region JO INTERNATIONAL AGRICULTURAL JOURNAL AU Pochyomin, N.M. AU Morkovkin, G.G. AU Shapovalov, D.A. AU Maximova, N.B. PY 2025 IS 0 PB Electronic science