%0 Journal Article %T PHOTOSYNTHETIC ACTIVITY OF SWEET CLOVER OF THE SECOND YEAR OF LIFE %A Grigor'ev, K.V. %A Shashkarov, L.. %K assimilating leaf surface, cover crop, sowing methods, varieties, seeding rate, photosynthetic activity, net productivity. %J Vestnik of Kazan State Agrarian University %D 2018 %N 12 %P 4 %I Kazan state agrarian University