Effects of Nitrogen Application at Different Wheat Growth Stages on Floret Development and Grain Yield of Winter Wheat

Study was carried out on effect of nitrogen application at different wheat growth stages on the floret development, the photosynthetic rate, the yield and its components of winter wheat. The result indicated that nitrogen applied at the Jointing stage and the Booting stage of wheat growth elongated the period for floret development, promoted the balance growth of floret and reduced the floret decadence number, thus increased the grain number per spike. Nitrogen applied at the middle and the late stages of wheat development increased the photosynthetic ability of the plant leaves in the later stage, and also lengthened the peak of grain filling stage, thus enhanced the grain weight and yield of wheat significantly.