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在年降水量４５０—６００ｍｍ的黄土高原旱作区，耕作土壤持水性好，渗透性强，具有显著的水分吐纳和调节功能，２ｍ土层内可容纳５５０—６００ｍｍ的水分，雨季降水是土壤水分补给的主要源泉．土壤蓄水量的高峰期和低谷期落后于降水的高峰期和干旱少雨期。蓄水量低谷期出现在６月中旬，元月上旬前后是蓄水最稳定时期。
In the arid area with an annual precipitation of 450-600mm, the tillage soil has good water-holding capacity and permeability, and has significant water content and regulation functions. The water content of 550-600mm can be accommodated in 2m soil layer. The main source of water supply. The peak and the trough of soil water storage lagged behind the peak precipitation and the arid period. The low water storage period appeared in mid-June, and the first stable storage period was in the first ten days of January.