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This article in SSSAJ

  1. Vol. 21 No. 5, p. 491-494
    Received: Jan 30, 1957
    Accepted: Apr 5, 1957

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Relationships of Atterberg Limits and Cation-Exchange Capacity to Some Physical Properties of Soil1

  1. William R. Gill and
  2. Carl A. Reaves2



The relationship between some physical and chemical properties of several soils were studied with a view of associating these properties with the mechanical strength of the soils. Shrinkage of natural clods in the tillable range of soil moisture was more closely correlated with the cation-exchange capacity than with the specific area or the plastic index. The correlations with these values were not as close in the case of puddled soils due to residual shrinkage. The sticky point is more a reflection of the water retention characteristic than a specific indicator of stickiness and has little value in tillage implement design; however, it may be of practical assistance in field work. The modulus of rupture was correlated with the specific area, plastic index, and cation-exchange capacity of the soils. With the exception of compressibility, the cation-exchange capacity appeared to be the value most closely correlated with the properties of the soils studied. Since the cationexchange capacity is frequently reported in nonphysical studies of the soil, a significant piece of information of physical property is available which should not be over-looked.

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