| 摘 要： | A 5-year experiment on water balance was conducted in a flat rainfed wheat field with an area of 66 m×100 m in Fengqiu, Henan Province, China. Based on the results of the 5-consecutive-year experiments, a reasonable irrigation model for wheat cultivation is suggested according to the principle of maintaining balance of the water resources. The irrigation program was designed by simulating the ideal soil moisture regimes during a wheat season. As far as the actual soil moisture was concerned, its deviation from the ideal soil moisture was kept within ±50 mm. If this model was put into practice, a grain yield of 5 250 kg ha-1 could be expected under optimal fertilization. Compared with the traditional irrigation scheme, the suggested model saved irrigation water by 18%.
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