%0 Journal Article %T Ways of improving the use of photosynthetically active radiation in potato cultivation in the middle Volga steppe %A Vladimirov, S.. %K leaf surface, photosynthetic potential (PP), potatoes, yield, starch, vitamin C, nitrates. %J Vestnik of Kazan State Agrarian University %D 2014 %N 8 %P 5 %I Kazan state agrarian University