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The Effect of Rhizobial Polysaccharides on Aggregate Stability
Author(s) -
Clapp C. E.,
Davis R. J.,
Waugaman S. H.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600050018x
Subject(s) - polysaccharide , soil water , chemistry , aggregate (composite) , moisture , food science , soil science , environmental science , materials science , organic chemistry , composite material
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.