| Based on the field experiment conducted in 2006-2008 in Changping, Beijing, which was set with 16 water fertilizer treatments with 5 factors (N, P , K , organic fertilizer and irrigation), while every factor had 4 levels. The objective of this experiment was to analyze the effects on wheat yield and soil moisture and to get the appropriate water fertilizer measure. The final results showed that appropriate water fertilizer accommodation improved soil moisture, increased yield of winter wheat and also improved the capacity of drought resistance. It was approved that the appropriate irrigation was 1 500~2 250 m·hm-2, higher level of irrigation led to soil moisture moved to the deep root level, on the contrary, lower level of irrigation reduced the nitrogen efficiency and wheat yield. Upon the appropriate irrigation, N fertilizer was the key factor to the wheat yield, the data showed that the yield increased under the N fertilizer amount of 150 kg·hm-2, whereas the yield decreased under the N fertilizer amount over 150 kg·hm-2. As a conclusion, the combination of 3 000 kg·hm-2 of organic fertilizer，150 kg·hm-2 of N fertilizer, 150 kg·hm-2 of P2O5 fertilizer, and 225 kg·hm-2 of K2O fertilizer, irrigation of 2 250 m·hm-2 was helping to the growth of winter wheat. |
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