Microbial cells in suspension were added to two soils. After drying, the degree of aggregation and stability of the aggregates to water was estimated by adding water, shaking and measuring turbidimetrically the particles remaining in suspension. In a silt loam (Hamble series), and sp. all promoted the stabilization of aggregates, this being related to the number of cells added, but inhibited the process. In a clay soil (Denchworth series), and sp. both promoted stabilization. The stabilization of the silt loam by was also produced by the polysaccharide extracted from the cell.


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