Physiological and biochemical properties of the natural rhizospheric association of Klebsiella terrigena E6 and Bacillusfirmus E3 were studied. It was demonstrated that this association fixed actively molecular nitrogen at a rate of 110 nmol ethylene per 1 mg protein per h. The dynamics of bacterial population in the association and in pure cultures were studied. The properties of this association depended on the ratio of its components; the maximal nitrogen fixation was recorded at a content of B. firmus E310 amounting to 15% of the total cell number. It was demonstrated that the stability basis of this association was the specific interactions via its components via metabolites--phenol and para-hydroxybenzoic acid--as well as via nitrogen fixation, respiration, and pH of the medium. A scheme of the interactions between the components of association is shown.
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