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" Sand 25 pounds. Loamy Soil 40 pounds. Clay Loam 50 pounds. Pure Clay 70 pounds. "
Practical Farm Drainage: Why, when and how to Tile Drain - 第 6 頁
Charles Gleason Elliott 著 - 1882 - 92 頁
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Primer of Irrigation

D. H. Anderson - 1903 - 298 頁
...opposite their respective names without dripping or running off. Quartz sand 25 pounds Calcareous sand 29 pounds Loamy soil 40 pounds Clay loam 50 pounds Pure clay 70 pounds But dry, peaty soils and adobe will absorb a much larger proportion before becoming saturated to the...
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