Synopsis Seventeen root‐restricting pans of the Southern Great Plains were investigated. The concept that soil pans are either genetic in origin or that they develop as a result of man's manipulation of the soil can explain less than half of the cases. The theory is developed that the root‐restricting features of these 17 pans are caused by excessive soil strength that occurs largely as a result of soil drying.
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Taylor et al. (1964) studied this question.