TY CONF TI THE EFFECT OF SOWING DATES AND SEEDING RATES ON YIELD AND PHOTOSYNTHETIC ACTIVITY OF LEAVES OF SPRING WHEAT SEEDLINGS KW spring wheat KW leaf surface area KW agrotechnology KW Krasnoyarsk forest-steppe JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Butkovskaya, L.K. AU Surina, E.A. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS