QUANTITATIVE AND QUALITATIVE EXAMINATION OF SOIL MICROFLORA ASSOCIATED WITH DIFFERENT MANAGEMENT SYSTEMS

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Abstract
Soil samples from field plots under long-term management systems were examined using standard plate count procedures. Samples collected at monthly intervals from the different plots showed a mean value for bacteria plus actinomycetes of 7 × 107/g soil. The mean for fungi was 4 × 105/g soil. Microbial populations were low for untreated soils, intermediate for soils treated with chemical fertilizers, and high for soils that received annual applications of manure. Soils cropped to wheat had greater numbers of microorganisms that those cropped to corn. Seasonal fluctuations in microbial numbers are discussed in relation to cultivation practices and to change in soil moisture and temperature. A total of 63 different fungal isolates representing 48 genera were identified; the Penicillium and Aspergilli predominated. The frequency of occurrence of some of the fungi is discussed in relation to the crop under cultivation, the soil treatment and/or the season of the year. Soil samples from field plots under long-term management systems were examined using standard plate count procedures. Samples collected at monthly intervals from the different plots showed a mean value for bacteria plus actinomycetes of 7 × 107/g soil. The mean for fungi was 4 × 105/g soil. Microbial populations were low for untreated soils, intermediate for soils treated with chemical fertilizers, and high for soils that received annual applications of manure. Soils cropped to wheat had greater numbers of microorganisms that those cropped to corn. Seasonal fluctuations in microbial numbers are discussed in relation to cultivation practices and to change in soil moisture and temperature. A total of 63 different fungal isolates representing 48 genera were identified; the Penicillium and Aspergilli predominated. The frequency of occurrence of some of the fungi is discussed in relation to the crop under cultivation, the soil treatment and/or the season of the year. © Williams & Wilkins 1978. All Rights Reserved.