Effect of irrigation with municipal water or sewage effluent on the biology of soil cores

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Abstract
Ten soil cores representing various New Zealand soil types were irrigated with secondary treated sewage effluent to determine if the actinomycete flora differed from that of similar cores irrigated with municipal tapwater. The dilution plate technique, with various selective media, was used to isolate strains of Nocardia, Rhodococcus, and thermophilic, neutrophilic and acidophilic actinomycetes. Soil differences were more important than treatment differences in affecting the numbers and kinds of actinomycetes isolated from the cores. The disposal of secondary effluent onto some soil types apparently does not radically alter the indigenous actinomycete population.

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