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按照联合国粮农组织《作物需水量》一书的定义，作物需水量是满足健壮作物生长因蒸发蒸腾损耗而需要的水量深度。影响作物需水量的因素主要有气象因素、生物因素和土壤因素，此外，还有地下水埋深、土壤含盐量等。作物需水量是农作物最主要的水分消耗部分，故在水资源开发利用?
According to FAO’s Crop Water Demand, the crop water requirement is the depth of water needed to meet robust crop growth due to evapotranspiration loss. The main factors affecting crop water demand are meteorological factors, biological factors and soil factors, in addition, groundwater depth, soil salinity and so on. Crop water demand is the most important part of the water consumption of crops, so in water resources development and utilization?