%0 Journal Article %T SECURITY OF MACRONUTRIENTS SUPPLY AND FORECASTING OF SPRING WHEAT PRODUCTIVITY IN THE REPUBLIC OF TATARSTAN %A Davlyatshin, I.. %A Lukmanov, A.. %A Avvakumov, O.. %A Badikov, A.. %K actual and moving average wheat productivity, mobile macronutrients of phosphorus and potassium, mineral and organic fertilizers, simple and multiple correlation. %J Vestnik of Kazan State Agrarian University %D 2014 %N 9 %P 3 %I Kazan state agrarian University