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This article in SSSAJ

  1. Vol. 43 No. 4, p. 765-768
    Received: Sept 11, 1978
    Accepted: Mar 7, 1979

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Microbial Effects on Soil Erodibility1

  1. Rafael Ricardo Gasperi-Mago and
  2. Frederick R. Troeh2



This study was undertaken to evaluate the effects of three microbial species on soil erodibility. Sterilized Ames (a Typic Albaqualf) and Nicollet (an Aquic Hapludoll) soils were inoculated with species of Pseudomonas, Streptomyces, and Penicillium. After 15 days of incubation, both treated and untreated soils were subjected to artificial rainfall to measure their erodibility. The Ames soil averaged 23% more runoff and 34% more sediment in the runoff than Nicollet, but 2.25 times as much Nicollet soil as Ames soil was caught on splashboards. Soil loss from sterile soil was more than from any other treatment, and that from the fungal treatment was the least. The unsterilized soil had runoff and erosion approximately equal to the average of the bacterial, actinomycetes, and fungal treatments used. The results show that all of the microbial treatments used had significant positive effects on erosion resistance and that the Penicillium sp. had the strongest effect.

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