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Microbial Effects on Soil Erodibility¹

ABSTRACT

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.

¹ Journal Paper J-9291 of the Iowa Agric. & Home Econ. Exp. Stn., Ames, Ia 50011. Project 2134. Contribution from the Dep. of Agronomy.

² Formerly graduate student, Dep. of Agronomy, Iowa State Univ., and now Assistant Professor, Universidad Centro Occidental, Maracay, Venezuela; and Professor, Dep. of Agronomy, Iowa State Univ., Ames, Iowa, respectively.

Received for publication September 11, 1978. Accepted for publication March 7, 1979.

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