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本文评述了灰钙（贫瘠、硬表层）土壤中的水分效应及其与土地的开垦状况和产量的相互关系。论述了该类土壤特性与作物潜在产量的关系。采用顺坡耕作、水平耕作及条播等３个处理，种植豆类、玉米两种作物，在径流小区内进行观测，并通过对几种简单公式的评价，证明了根区的水分贮存量由于侵蚀作用而减少，而有效水含量的损失会导致作物产量显著降低，用物理学方法推导出灰钙土的相对潜在产量。总之，由土壤环境提供的根系赖以生存的土壤有效水含量（ＡＷＣ）决定了土壤的相对潜在产量。
This paper reviews the water effects in gray-calcium (poor, hard surface) soils and their relationship to land reclamation and yield. The relationship between soil characteristics and crop potential yield was discussed. Using three treatments of slope farming, horizontal farming and sowing, two crops of legumes and maize were planted and observed in runoff plots. The evaluation of several simple formulas proved that the water storage in the root zone was affected by erosion And the loss of effective water content will lead to a significant reduction in crop yield, and the relative potential yield of calcareous soil will be deduced by physical methods. In summary, the soil available water content (AWC), the root system provided by the soil environment, determines the relative potential yield of soil.