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Acetylene reduction activity per single plant, and specific acetylene reduction activity per nodule g dry weight on 17 DAP supplied with control (N-free), nitrate, ammonium, urea, or glutamine from 12 to 17 DAP for 5 days (Experiment 1). (A) ARA per single plant. (B) Specific ARA per g dry weight of nodules. Averages and standard errors are shown (n = 4). Different letters above the column indicate significant differences at <0.05 by Tukey’s test.
