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Published in Soil Sci Soc Am J 26:466-469 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of Rhizobial Polysaccharides on Aggregate Stability1

C. E. Clapp, R. J. Davis and S. H. Waugaman2

ABSTRACT

Sixteen rhizobial polysaccharides previously isolated and characterized and representing several cross-inoculation groups were screened for aggregate stabilization effects on 10 subsoils of widely varying properties. Two additional polysaccharides of bacterial origin and three chemical compounds were included for comparison with the rhizobial products.

Artificial aggregates were prepared in acrylic plastic molds under standardized moisture conditions. An ethanolwater microslaking procedure for assessing stability was used to determine relative effects between aggregating agents and soils. At the low concentrations used, several rhizobial polysaccharides were more effective stabilizing agents on most soils than either the synthetic soil conditioner or the other reference compounds. Some general comparisons relating carboxyl content and viscosity of the rhizobial polysaccharides and clay content with aggregate stabilization are presented and discussed.

NOTES

1 Contribution from the U. S. Soils Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md. Presented in part before Division III, Soil Science Society of America, Chicago, Ill., Dec. 5, 1960.

2 Chemist (Present address: Department of Soils, University of Minnesota, St. Paul, Minnesota), Soil Scientist, and Physical Science Technician, respectively, Beltsville, Md.

Received for publication December 13, 1961. Accepted for publication April 2, 1962.






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