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Published in Soil Sci Soc Am J 20:341-344 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Dehydration-Rehydration on Cation Exchange Capacity of Hawaiian Soils1

Yoshinori Kanehiro and G. Donald Sherman2

ABSTRACT

Dehydration, induced by extended sun-drying or by short periods in an oven at 105° C., reduced the cation exchange capacity of a soil. This reduction generally increased with the annual rainfall, being most pronounced in the wettest soils of the Islands. Furthermore, in a given profile of these extremely wet soils, this reduction increased with depth. This trend is culminated in a subsoil of a Hydrol Humic Latosol (307% moisture) which dropped in capacity value from 125.8 me./100 g. to 37.6 me./100 g. in 100 days of sun-dehydration.

Removal of natural vegetative cover in a virgin area caused a reduction of 16.8% in cation exchange capacity for the surface soil at the end of 10 months in a Humic Latosol. Also, in this same area comparative figures for the virgin and cultivated surface soils show that extended cultivation with subsequent susceptibility to dehydration has caused a loss of 27.8% of the cation exchange capacity of the soil.

Soils which are located in dominantly dry areas showed a seasonal effect on cation exchange capacity. Samples taken after a rainy season showed slightly higher values than those taken during a dry season in a given site.

Dehydrated soils increased significantly in cation exchange capacity upon rehydration in dry and moderately wet area soils. This display of reversibility was not evident in wet area soils.

NOTES

1 Published with the approval of the Director of the University of Hawaii Agr. Exp. Sta. as Technical Paper No. 352.

2 Junior Chemist, and Chemist, respectively, University of Hawaii Agr. Exp. Sta.

Received for publication July 14, 1955.




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Copyright © 1956 by the Soil Science Society of America.