TY JOUR TI Fluorescence of corn chlorophyll and the mechanism of increasing its yield when applying mineral fertilizers KW corn KW photosynthesis KW net photosynthetic productivity KW fluorescence KW mineral fertilizers KW root system KW root secretions KW yield KW rhizosphere KW microorganisms JO Agrarian Bulletin of the AU Ovsyannikov, Y.A. PY 2021 IS 205 PB Ural State Agrarian University