Effects of fertilization on dry matter accumulation of winter wheat in dryland

The effects of fertilization on the number of all stems, on the leaf area index and on dry matter accumulation during all stages and economic yield of winter wheat in dryland were studied. Also, the relationship between these growth elements and yield was investigated. The results were as follows: Fertilization obviously increased the number of tillings, so increased the number of stems and ears of winter wheat per hectare as well. Similarly, fertilization application enhanced the leaf area index and amount of dry matter accumulation at all stages, esp. at filling time. To all fertilization treatments, the accumulation process of dry matter could be well fitted in the exponential equation y=a e b/x . Moreover, with fertilization amount rising, the a's value raised and b's remained stable. The correlation analysis indicated that the growth condition before winter and during filling stage were more important for yield formation of winter wheat in dryland than that at other stages.