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采用根箱法，在人工气候箱和自然条件下，分别研究了隔水层对土壤水分和谷子、冬小麦根系通过提水作用利用下层水分对上层土壤中肥料的增产效应。结果表明，在同一生长条件下，隔水层可明显增加下层土壤贮水量，谷子能利用下层土壤水分增加上层土壤氮磷钾肥料的肥效，明显增加肥料的增产率。土壤剖面设置隔水层虽有保墒贮水的功能，但其对作物生物学产量的效应还有必要深入研究，以探索出既保墒又高产的旱地农业水肥管理技术。
Using root box method, under the artificial climate chamber and natural conditions, the effects of aquifers on soil fertility and millet and winter wheat root system were studied. The results showed that under the same growth condition, the aquifer could significantly increase the water storage capacity of the lower soil, and the millet could utilize the lower soil moisture to increase the fertilizer efficiency of the upper soil nitrogen, phosphorus and potassium fertilizers and significantly increase the yield of fertilizers. Although the soil profile has the function of holding moisture in the soil profile, it is necessary to further study the effect of the biological yield of crops in order to explore the technology of dry-land agriculture water and fertilizer management which not only preserves soil moisture but also produces high yield.