在农田水分平衡中，较难测定的要素有农田蒸腾蒸发量、地下水毛细上升量和土壤水渗漏量。
Of all components of water balance in farmlands, evapotranspiration, capillary rise from a water table and deep percolation are difficult to determine.
退水量和地下水埋深之间近似为幂函数关系，与蒸发量之间近似服从线性关系。
The relationship between drainage water volume and groundwater table agreed with by power function, drainage water volume and evapotranspiration, a linear function.
退水量和地下水埋深之间近似为幂函数关系，与蒸发量之间近似服从线性关系。
The relationship between drainage water volume and groundwater table agreed with by power function, drainage water volume and evapotranspiration, a linear function.
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