00526naa#a2200169#i#450# EN\\bibl\614 20250107143501.2 2073-0462 20131024b2013####ek#y0engy0150####ca RUS RU Efficiency of use of increasing doses of mineral and organic fertilizers on potato in the middle Volga steppe Journal article Kazan Kazan state agrarian University 2013 3 с. Journal article local Vladimirov Sergey zh-szf.ru