According to the differences of soil water potential in the farmland, variable irrigation can save water as well as raise economic benefit.

依据农田内土壤含水率的差异性，有针对性地进行变量灌溉，既可节约用水又可提高经济效益。

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On the basis of the experimental data in farmland, a function relationship between the potential evapotranspiration and the relative water content of the soil in the root zone was established.

以田间实验资料为基础，建立农田蒸散量和土壤相对含水量与潜在蒸散的函数关系。

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First, it is increasingly difficult to raise the current level of food production owing to a potential impact of farmland, water resources, climate and other related factors.

首先，它是越来越困难，提高粮食生产水平由于潜在影响的耕地，水资源，气候及其他相关因素。

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