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.
农田秸秆覆盖后作物苗期棵间土壤蒸发明显减少，使旺盛生长期可利用水分增加，提高了水分的利用率。
Because soil evaporation was reduced obviously in the earlier stage of crop growth, available water was increased during flourishing stage of crops. So water use efficiency was increased.
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