%0 Journal Article %T Spring wheat productivity forecasting in the forest steppe zone of Volga by least squares method %A Avvakumov, O.. %K arable land, productivity, spring wheat, mineral and organic fertilizers, moving average, analysis of variance, least squares method %J Vestnik of Kazan State Agrarian University %D 2014 %N 8 %P 6 %I Kazan state agrarian University