TY JOUR TI Delineation of stable within-field management zones based on remote sensing for precision crop production management: a case study from the forest-steppe zone of European Russia KW precision agriculture KW remote sensing KW ASF-index KW within-field zones KW bare soil surface KW multitemporal soil line KW variable-rate fertilization KW variable-rate seeding JO INTERNATIONAL AGRICULTURAL JOURNAL PY 2026 IS 0 PB Electronic science