TY JOUR TI THE SOWING PERIOD INFLUENCE ON THE SEED QUALITY IN THE KRASNOYARSK FOREST-STEPPE CONDITIONS KW sowing periods KW sorts KW plant chemical protection agents KW fertilizers KW weight of 1000 grains KW ripeness groups KW germination JO Bulletin of KSAU AU Butkovskaya, L.K. AU Ageeva, G.M. PY 2014 IS PB Krasnoyarsk State Agrarian University