Morphological Relationships of Soil Microbes

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Abstract
Periodical micro-scopic counts on suspensions made from soil samples of 1500 gm. maintained at normal moisture capacity at 20-25[degree] C. showed that annual application of manure to Palouse silt loam over a period of 27 yrs. resulted in marked increase in numbers of both coccoid (autochthonous) and rod-shaped (zymogenic) organisms and to some extent in the numerical relationships between these 2 groups. Addition of 1% filter paper caused a large increase in numbers of the zymogenic group in presence of readily available N. The increase in numbers and changes in numerical relationships resulting from addition of organic substances were not commensurate with the increase in total microbial activity as measured by liberation of CO2 from the soil.

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