SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 44:934-938 (1980)
© 1980 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Increases in the Cation Exchange Capacity of Variable Charge Soils Following Superphosphate Applications1

G. P. Gillman and R. L. Fox2

ABSTRACT

The cation exchange capacity (CEC) of soils from field plots which were fertilized with concentrated superphosphate for 8 years has been measured. The superphosphate was added in amounts equivalent to those needed to raise solution P to 0.001 to 1.6 µg/ml in the adsorption isotherm. Three variable charge soils from Hawaii, a Hydrandept, a Gibbsihumox, and a Eutrostox were examined, using a new method for estimating the CEC of variable charge soils. This method takes account of pH and ionic strength conditions in the field. Agronomically significant increases in CEC of the surface horizons with increasing superphosphate application were obtained. As a result, the leaching of applied nutrients, Ca, Mg, and K, was retarded, and greater quantities of these cations were present in the 0–50 cm profile than in the plots receiving no P, despite the fact that more cations were removed from the P treated plots by crops grown in succession.

NOTES

1 Journal Series no. 2398 of the Hawaii Agric. Exp. Stn.

2 Senior Research Scientist, Division of Soils, Commonwealth Scientific and Industrial Research Organization, Davies Laboratory, Townsville, 4810, Australia; and Professor, Dep. of Agronomy & Soil Science, Univ. of Hawaii, Honolulu, HI 96822, respectively.

Received for publication December 14, 1979. Accepted for publication April 4, 1980.






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