00623naa#a2200193#i#450# EN\URAL'SKIY GOSUDARSTVENNYY AGRARNYY UNIVERSITET\bibl\38379 20260323201437.1 1997-4868 20200620b2020####ek#y0engy0150####ca RU Improving crop production efficiency by optimizing the timing of field work Journal article Ekaterinburg Ural State Agrarian University 2020 12 с. Journal article local Stepnyh N. V. Nesterova E. V. Gilev S. D. Zargaryan A. M. usau.editorum.ru