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在河北省灌区内作物的灌溉定额,一般是依据作物生育期内的降雨量确定的,没有考虑作物生育期前降雨对它的影响。而河北省夏秋降雨往往偏多,除部分产生径流,部分渗入地下以补充地下水外,还有相当大的一部分存贮在2～3米的包气带土壤内,冬小麦可以充分利用这部分土壤贮水。本文所预报的冬小麦灌溉定额就是减掉这部分土壤贮水后的灌溉定额,并把它与实际灌溉定额进行了比较。
Irrigation quotas for irrigated crops in Hebei irrigation areas are generally based on rainfall during the growing season of the crop and do not take into account the effects of rainfall before the crop is growing. However, rainfall in summer and autumn in Hebei Province tend to be more than normal. In addition to partial runoff and partial seepage into the ground to supplement groundwater, a considerable part is stored in 2 to 3 meters of aerated soil. Winter wheat can make full use of this part of soil water. The winter wheat irrigation quota forecast in this paper is the deduction of the irrigation quota after the storage of this part of the soil and compares it with the actual irrigation quota.