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Extractable Aluminum in Some Hawaiian Soils¹

ABSTRACT

Extractable Al was measured in 5 Hawaiian soils from Kauai at four 3-month intervals. A relationship between extractable Al and rainfall was observed. Highest extractable Al was measured during high rainfall periods (winter) and lowest extractable Al was measured during low rainfall periods (summer). High extractable Al was also observed in the poorly drained Koolau soil. Low extractable Al during summer months could be the result of inactivation of Al on cation-exchange sites due to dehydration. The method used for extractable Al in this study probably measured both "exchangeable" and "soluble" Al. Plant Al analysis indicated not all extractable Al measured was available to the plant. In subsoils treated with lime, extractable Al decreased with increased pH. Lower extractable Al due to P treatment was interpreted as inactivation of Al as the latter reacted with the phosphate.

¹ Published with the approval of the Director of the Hawaii Agr. Exp. Sta., University of Hawaii, Honolulu, as Technical Paper No. 562.

² Assistant Agronomist and Senior Soil Scientist and Senior Professor of Agriculture, respectively, Department of Agronomy and Soil Science, University of Hawaii Honolulu.

Received for publication February 26, 1962. Accepted for publication April 23, 1962.