Effects of Long-term Fertilization on Dry Matter Production,Yield Formation, K Uptake and Distribution of Winter Wheat(Triticum aestivum L.)

Methods of field experiment,chemical analysis and data statistics were employed to study the effects of long-term fertilization on dry matter production,yield formation,K uptake and distribution of winter wheat.The results showed that NPK,NPKM and SNPK treatments significantly increased tiller number,dry matter accumulation,grain yield and K uptake of winter wheat,but there were no significant difference in these parameters between these three treatments.K accumulation of winter wheat was maximal from flowering period to filling period.K uptake at shooting period was significantly positively correlated to grain yield,dry matter accumulation,spike number,kernel number per spike,plant hight and spike length.K excretion phenomenon of winter wheat was observed and K excretion rate was 43.05-114.81 kg/hm2,which was 1.55-3.09 times of K accumulation at maturing period.