叶水势可以反映作物水分状况，叶温越高，叶水势越低。
Water potential of leaf reflected crop water condition. The lower water potential of leaf the higher leaf temperature.
土壤水分一般处于低储量、低利用的状况，各地程度不同地保持着可供地面作物利用的土壤水分潜力。 采取调整农林草的地区品种结构；
The soil moisturegenerally is the state with low storage and low usability, all kinds of landremainds moisture potentiality in soil usable to the crops on the ground indifferent extent.
农田水分管理以及产量评估都需要对土壤作物受旱状况定量化和指标化。
A quantitative drought index is necessary for soil water management and crop yield evaluation.
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