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Published in Soil Sci Soc Am J 35:460-463 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Soluble and Exchangeable Aluminum on a Soil Bacillus1

A. A. Zwarun, B. J. Bloomfield and G. W. Thomas2

ABSTRACT

The test organism, a Bacillus species isolated from soil, behaved as a typical cation exchanger having a CEC of 95 meq/100-g organism (oven-dry weight). Increasing acidity from pH 6.6 to 4.5 greatly reduced the number of surviving cells suspended for 3 hours in an acetate buffer. Addition of soluble aluminum up to 80 ppm produced no further detrimental effect upon the organism, even though the cell walls of the organism were saturated with aluminum. Exchangeable aluminum in the form of Al-saturated Wyoming bentonite decreased the number of surviving cells as compared with a Ca- saturated Wyoming bentonite. Addition of soluble Al to the Al-clay suspension did not result in any interaction. Upon incubation with the clay suspensions, the organism changed its gram-staining characteristic. Clay particles in all treatments were adsorbed by the cells producing organism-clay aggregates.

NOTES

1 Contribution from the Dept. of Agronomy, Univ. of Kentucky, Lexington. The research reported in this paper (no. 70-3-92) is in connection with a project of the Kentucky Agr. Exp. Sta. and published with the approval of the Director.

2 Former Graduate Assistant, Assistant Professor, and Professor, respectively, Dept. of Agronomy, Univ. of Kentucky. The senior author is now Assistant Professor, Dept. of Agriculture, Univ. of Maryland Eastern Shore, Princess Anne, Md. 21853.

Received for publication July 17, 1970. Accepted for publication January 31, 1971.






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Copyright © 1971 by the Soil Science Society of America.