Characteristics of Bacteriostasis in Natural Soils

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Abstract
Streptomycin-resistant bacteria were added to natural soil and their numbers were deter- mined at o and 24 h using soil extract agar supplemented with streptomycin. None of 10 rhizosphere and 10 non-rhizosphere bacteria tested increased in number in soil. Moreover, no increase was detected when six identified bacteria were added to soil. Agrobacterium radiobacter did not increase in any of seven soils tested. However, its population increased greatly in autoclaved soil as well as in nutrient-amended soil. The bacterium did not grow in distilled water, but grew abundantly in a nutrient solution. The characteristics of soil bacteriostasis appear to be similar to those of soil fungistasis.

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