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Comparison of the concentrations of the principal N metabolites in the nodules of nodulated soybean plants treated with various N compounds. Treatments: Cont, control with N-free solution; NO3−, 5 mM KNO3; NH4+, 2.5 mM (NH4)2SO4; urea, 2.5 mM urea; NO3− + NH4+, 2.5 mM KNO3 + 1.25 mM (NH4)2SO4. n = 3. Average ± standard error. The different letters on the top of the columns indicate significant differences in the N concentration among the N treatments based on Tukey’s test (p < 0.05).
