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Mean effects of nitrogen source in the nutrient solution (A) and root inoculation with B. japonicum (B) on the time course of NP in fully developed leaves of soybean grown in NFT (Average values ± Standard errors, n = 6). Average values of non inoculated and inoculated gullies fertigated with nitrate solution (NO3) and urea solution (U). Average values of gullies fertigated with nitrate and urea solutions in non inoculated control (C) and inoculated treatment (I).
