A STUDY OF BACTERIUM GLOBIFORME CONN IN SOILS DIFFERING IN FERTILITY

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Abstract
Observations were made of the abundance of Bacterium globiforme Conn in three soils that had been subjected to different fertilizer treatments. It was found that the organism was as numerous in a soil of low fertility which had been cropped continuously for 25 years without application of fertilizer as in plots of greater crop-producing power receiving farmyard manure and artificial fertilizer. Freezing of the soil under field and artificial conditions had no significant effect on the numbers of the organism.From the soils, 110 cultures of Bad. globiforme were isolated; ten strains were studied in detail. All showed characteristic metamorphosis from rod to coccus though variations in cell size and time-rates of change were observed. The change of shape is not merely a shortening of the rod until the organism becomes spherical, but involves a swelling of the rod followed by a fragmentation leaving ovoid bodies which become cocci.

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