PRESUMPTIVE EFFECT OF AGGREGATES ON TEXTURAL CLASSIFICATION

概要

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Although the term soil texture has often connoted the primary particle-size distribution, the textural class names seem to have the established concept of soil structure and do not yet lose their original meanings. It is expected, therefore, that the textural classification becomes more significant if the secondary particles, aggregates, are taken into account. From a review of reports on this topic, the following assumption is made ; a constant proportion of the primary clay fraction forms part of the aggregates of sand size where the value of the proportion is -0.3. Comparing the usual textural classification with the proposed one, most of the areas in which one fraction predominates are almost similar, except for l am in the usual classification, because the loams are the soils in which no one fraction dominates. Generally speaking, the physical properties of the loams are various owing mainly to aggregate formation, and thus the loams are simulative to the productive sandy soils under suitable conditions. Moreover, Heavy Clay in the usual textural classification is clayey, even if aggregates are taken into account, and its voids are all surrounded by clay particles excepting the pores in the aggregates.
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