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Influence of Soil Microstructure on Water Characteristics of Selected Hawaiian Soils¹

ABSTRACT

The higher water-holding capacity of Oxisols and Ultisols compared to that of the Vertisols and Inceptisols at 15 bars of suction is attributed to the presence of intra-aggregate void spaces. Existence of such voids was verified with the aid of a scanning electron microscope. These voids are obvious in soils with kaolinitic and oxidic mineralogy but are not evident in soils of montmorillonitic or amorphous oxide composition.

¹ Published with the approval of the Director, Hawaii Agr. Exp. Sta., Honolulu, 96822 as Journal Series 1724. This work was supported in part by 211(d) Grant AID/csd-2833.

² Assistant Soil Scientist, Assistant Specialist in Soil Science, and Assistant Soil Scientist, respectively, Univ. of Hawaii.

Received for publication March 6, 1974. Accepted for publication September 16, 1974.

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