Summary
In soil incubated at 30°C no significant change in total counts of streptomyces, other bacteria, or antagonistic types of either group occurred during a 30 to 40-day observation period. Addition of 0.5% (w/w) sodium nitrate had no significant effect on the counts. Organic substances induced a rapid multiplication of micro-organisms, antagonistic types increasing more than others. The main increase in the percentage of antagonists coincided with the period of maximum growth. Organic substances differed in their effects. Some favoured the antagonistic streptomyces and some other antagonistic bacteria. Streptomyces contained the majority of the organisms that were shown to produce antibiotics.
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Abd-El-Malek, Y., Monib, M. & Zayed, M.N. Effect of organic matter on the development in soil of antibiotic-producing micro-organisms. Plant Soil 15, 25–36 (1961). https://doi.org/10.1007/BF01421748
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DOI: https://doi.org/10.1007/BF01421748