00532naa#a2200169#i#450# EN\\bibl\1087 20241009064759.3 2073-0462 20140113b2014####ek#y0engy0150####ca RUS RU Ways of improving the use of photosynthetically active radiation in potato cultivation in the middle Volga steppe Journal article Kazan Kazan state agrarian University 2014 5 с. Journal article local Vladimirov Sergey naukaru.ru