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通过 1998～ 2 0 0 0年田间节水灌溉试验 ,确定了北屯灌区戈壁土层畦灌春小麦最佳土壤平均含水率下限为 6 5 %～ 8 0 % ,灌水后土壤平均含水率为 17%～ 18% ,灌溉定额为 75 0 0m3·hm- 2 ;沟灌油葵最佳土壤平均含水率下限为 6 5 %～ 8 0 % ,灌水后土壤平均含水率为 14%～ 18% ,灌溉定额为 375 0m3·hm- 2 。据此分别制定了该灌区畦灌春小麦和沟灌油葵的最适宜灌溉制度
Through the experiment of field water saving irrigation from 1998 to 2000, the lower limit of the average soil water content is 65% ~ 80% and the average soil water content after irrigation is 17% ~ 18%, and irrigation quota is 7500 m3 · hm-2. The lower limit of average soil water content of sunflower is 65% ~ 80%, average soil water content after irrigation is 14% ~ 18% and irrigation quota is 375 0m3 · hm-2. According to this, the most appropriate irrigation system for irrigation of spring wheat and furrowed sunflower in the irrigation area were formulated respectively