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Pore Space-Clay Ratio, an Important Index to the Physical Character of Soil

ABSTRACT

A study was made of the pore spaceclay ratio from the different horizons in thirty-six soil profiles. Soils which have a favorable physical condition for moisture absorption and crop production have a pore space-clay ratio which is above 1.5. Values below 1.0 are unfavorable for moisture absorption and plant development under the climatic conditions which prevail in Oklahoma. When soils contain very small percentages of silt and clay, the percentage of fine and very fine sand are the most important factors in relation to moisture retention and plant development. High volume weight and high clay content indicate a dense soil. Low volume weight and high clay content cannot be definitely associated with the presence of non-capillary pore space, but this relation occurs in the normal soils which have been studied in this investigation.