TY JOUR TI SOWING PROCESSES TECHNICAL EQUIPPING SUBSTANTIATION IN THE CONDITIONS OF PLANT GROWING INSUFFICIENT RESOURCES POTENTIAL KW modeling KW sowing KW harvesting KW economic efficiency JO Bulletin of KSAU AU Shepelyov, S.D. AU Kravchenko, I.N. PY 2012 IS PB Krasnoyarsk State Agrarian University