Abstract
The effect of inoculation of N2 fixation by soybean plants, grown in sandy soil was studied in pot experiments.Bradyrhizobium japonicum (Rh) and/or mycorrhizae, in the presence of basic application of a P fertilizer (super or rock P), and two levels of15N-labelled ammonium sulfate (20 and 100 mg N per kg soil), were used. Highest N2 fixation was observed after a dual inoculation (Rh+VAM), followed by single inoculation (Rh) and by mycorrhizal infection. Higher doses of N fertilizer depressed the capacity of the plant nodules and the inoculants for N2 fixation.
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