许多人试图通过减少灌溉频率或改种需水量更少的作物来节约用水。
Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water.
实际的需水量根据植物种类，气候(植物吸收的大部分水用于进行蒸发降温)，和灌溉效率的不同而有所不同。
The actual water requirements differ according to plant, climate (most of the water withdrawn by plants is for cooling through evaporation) and the efficiency of irrigation.
在对灌区来水和需水随机性分析的基础上，建立了一种确定灌区灌溉用水保证率的计算模型。
A calculation model is established in the paper for determining the water use ensurance probability based on the statistic analysis of irrigation area inflow and water needed.
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