The Relationship between Micro-organisms and Soil Aggregation

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Abstract
Because of the improvement in the physical condition of soil following the addition of readily decomposable organic material, a number of pure cultures of microorganisms were tested for beneficial effect alone and in combinations. Included were fungi, actinomycetes, yeasts, proactinomycetes, and gum-producing and other bacteria. Production of improved soil aggregates was the criterion of effectiveness. Complex mixtures containing fungi, actinomycetes and bacteria gave good aggregates when all the microorganisms were compatible. However, although temporary improvement of soil structure after the addition of organic materials can be partly explained by the action of microbes, the permanent crumb structure of many soils must be due mainly to other causes.

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