TY JOUR TI SECURITY OF MACRONUTRIENTS SUPPLY AND FORECASTING OF SPRING WHEAT PRODUCTIVITY IN THE REPUBLIC OF TATARSTAN KW actual and moving average wheat productivity KW mobile macronutrients of phosphorus and potassium KW mineral and organic fertilizers KW simple and multiple correlation. JO Vestnik of Kazan State Agrarian University AU Glushko, S.. AU Galiullin , I.. PY 2014 IS 9 PB Kazan state agrarian University