TY JOUR TI MANAGEMENT OF POTATO PRODUCTIVITY WITH THE USE OF GROWTH REGULATORS IN THE FOREST-STEPPE AREA OF THE MIDDLE VOLGA KW class KW calculated dose of fertilizer dose KW yield KW growth regulators KW indicators of the quality of tubers KW starch KW vitamin C and protein. JO Vestnik of Kazan State Agrarian University AU Chekmarev, P.. AU Mostyakova, A.A. AU Vladimirov, V.. PY 2015 IS 10 PB Kazan state agrarian University