TY CONF TI THE DEVELOPMENT OF AGRICULTURE FROM THE AFANASIEV ERA TO THE TASHTYK CULTURE KW hoeing KW plough farming KW fallow KW humus KW grain JO «PROBLEMS OF SOIL FERTILITY IN MODERN AGRICULTURE» AU Stepanenko, N.I. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS