TY JOUR TI WAYS TO INCREASE THE PHOTOSYNTHETIC ACTIVITY OF EARLY MATURING POTATO OF ZHUKOVSKIY RANNIY VARIETY IN THE MIDDLE VOLGA FOREST-STEPPE KW leaf area KW photosynthetic potential (PP) KW potatoes KW yield KW starch KW vitamin C KW nitrates. JO Vestnik of Kazan State Agrarian University AU Vladimirov, K.V. AU Mostyakova, A.A. AU Vladimirov, V.P. AU Egorov, L.M. PY 2015 IS 10 PB Kazan state agrarian University