The presence and distribution of sulfofying bacteria in mineral and peat soils
1932
Wilson, J.K. | Higbee, H.W.
More than 200 samples were examined for the numerical presence of sulfofying bacteria. Some were freshly collected samples, while others had been in an air-dry condition for 7 years. They represented mineral and peat soils. Some were collected at two seasons of the year from the same location. The largest number of sulfofying bacteria found in any sample was 10,000 per gram. In only four samples were the bacteria absent in a 2-gram quantity. These had been in an air-dry condition for several years. No relationship was evident between the number of salfofying bacteria and the reaction of the soil or between the number of such organisms and the content of calcium, magnesium, sulfur, nitrogen, or phosphorus or between the numbers present and the ratios of these elements one to another. It is indicated that an air-dry peat soil whose CaO content is high may contain more sulfofying bacteria than one whose CaO is lower. Air-drying soils reduced the number of sulfofying bacteria but did not destroy all of them. Data from six soil types representing 20 samples taken both in the spring and in the fall from the same location show a larger number of sulfofying bacteria in every case in those samples collected in the fall. No one soil series was strikingly more efficient in supporting the sulfofying bacteria than was any other. Each soil series examined, whether inorganic or organic, has a native sulfofying flora that prevents the accumulation of elemental sulfur in the soil.
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