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Significance of Extractable Aluminum in Hawaiian Sugarcane Soils¹

ABSTRACT

Aluminum was extracted with water and solutions of NH₄OAc, pH 4.8, and KCl from Humic, Hydrol Humic, and Humic Ferruginous Latosols (some of which are considered potential commercial sources of Al) as well as from certain less weathered soils. Exchangeable Al appeared to account for only a small fraction of the Al extracted from some of the more highly weathered soils. NH₄OAc-soluble Al increased markedly with degree of weathering of the soil, but this was not true of KCl- or water-soluble Al. Within each great soil group Al, soluble in all three extractants, increased many times with decreasing soil pH. Concentrations of Al in water extracts did not exceed 2.5 ppm; in soils of pH 5.0 or above, concentrations seldom were in excess of 0.1 ppm. The addition of limestone effectively decreased levels of both NH₄OAc- and water-soluble Al. These results, coupled with field observations, have led to the conclusion that Al levels in Hawaiian soils are not sufficiently high to repress the growth of sugarcane.

¹ Published with the approval of the Director as Paper no. 153 in the Journal Series of the Experiment Station, Hawaiian Sugar Planters' Ass., Honolulu, Hawaii.

² Agronomists, Hawaiian Sugar Planters' Ass. Exp. Sta., Honolulu, Hawaii.

Received for publication November 10, 1964. Accepted for publication March 8, 1965.