EFFECT OF INOCULATING A SOIL WITH AZOTOBACTER UPON PLANT GROWTH AND NITROGEN BALANCE ' By P. L. GAINEY Soil bacteriologist, Kansas Agricultural Experiment Station INTRODUCTION
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چکیده
In 1923 a 20-year experiment was begun in an effort to gain information on the following points: (1) The factors that influence the longevity of Azotobacter when introduced into a soil from which it is normally absent; (2) the effect of introducing and maintaining an Azotobacter flora in such a soil upon the crop-producing abihty and the nitrogen balance of the soil. The recent comprehensive survey of the literature on this subject by Allison^ eliminates the necessity of a review of previous work; those interested in the problem are referred to this excellent summary.
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