A BACTERIOLOGICAL STUDY OF A SOIL TYPE BY NEW METHODS

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Abstract
Factors increasing the gelatin plate count of Hoosick coarse sandy loam were liming, addition of peat, and prolonged aeration. The latter modified the flora, encouraging an abundance of coccus-forming rods previously absent. The bacterial form groups found under the microscope were normally similar to those from neutral and alkaline Dunkirk soils, but the Hoosick soil supplied with soybean meal failed to develop certain small short rods until 1 % of CaCOs was added. When peptone was supplied the soils, CaCO3 did not overcome the differences, the Hoosick soil developing certain very short rods not found in the other soils. This indication of an abnormal flora suggests the value of combining Winogradsky''s technic of microscopic classification with the plate culture method for qualitative study of microfloral differences in soils. The technic is described.
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