Soil reaction and nitrogen fixation
1928
Krishna, P.G.
Confirming the results obtained by other investigators, these observations show a very good correlation between the reaction of the soils and their nitrogen fixation. There was a progressive increase in the amounts of nitrogen fixed with decreasing acidity of the soils. About 3.0 mgs of nitrogen were fixed by soils with reactions between pH 5.2 and 5.9, while between 3.6 and 4.7 mgs of nitrogen were fixed in soils with reactions between pH 5.9 and 7.65. There was no correlation between numbers of bacteria and nitrogen fixation, between bacterial numbers and soil reaction, or between the soil reaction and the disappearance of dextrose. The soil reaction is the dominant factor influencing nitrogen fixation in soils.
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