00522naa#a2200169#i#450# EN\\bibl\8226 20260128024322.3 2073-0462 20150915b2015####ek#y0engy0150####ca RUS RU METHOD OF CROP ENERGY CALCULATION, LOST BECAUSE OF THE NEGATIVE IMPACT OF TRACTOR’S PROPELLER ON THE SOIL Journal article Kazan Kazan state agrarian University 2015 4 с. Journal article local Khafizov Ramil naukaru.ru