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Cation exchange capacity is a very significant soil parameter. It can be defined as the ability of a soil to hold cations in readily available form. I t is considered as perhaps the most important single measurement of the fertility potential of soils. There are various methods used for the determination of cation exchange capacity, but all of them are rather laborious and must be performed by expert technicians. Thus, there is need either for the development of simpler direct measuring techniques or of indirect methods to approximate cation exchange capacity values. Furthermore, considerable variability in cation exchange capacity has been observed in what can be considered as similar soils. Usually this variability is attributed to variations in particle size distribution, clay minerals and organic matter content. However, such explanations are not always satisfactory. Thus, this paper reports on attempts to explain this variability mathematically in terms of particle size and organic matter content. The hypothesis tested postulated that variations in cation exchange capacity were directly related to the percentage of particles smaller than 0.05 and 0.002 mm., and to the organic-matter percentage. If a single or a multiple correlation could have been proved valid, then by simple laboratory determinations and calculations an indirect method to predict cation exchange capacity values would be available.

Attempts to Explain the Variability in the Cation-Exchange Capacity of Soils in Terms of Particle Size and Organic-Matter Levels