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NH4+ fluxes. (A) Rice (Oryza sativa) suspension cells cultured in the absence (–Si) and presence (+Si) of 1.0 mm silicic acid for 3 months after transplanting to solution medium from solid culture medium prior to NMT measurements. Arrows show a probed rice cell and NH4+ ion-selective microelectrode, respectively. (B, D) Net and (C, E) mean fluxes of NH4+ and NO3− ions (mean ± SD, n = 8), respectively. Different lower-case letters in C and E indicate a significant difference at P < 0.05.
