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NO3– ion flow rate in root of M9T337 seedlings treated with K0 (0 mM K+), K3 (3 mM K+), K6 (6 mM K+), K9 (9 mM K+), or K12 (12 mM K+) in 2018 and 2019. (A) Net NO3– fluxes in the root of apple seedlings for 10 min. (B) Mean rate of NO3– fluxes during the entire 10 min. Data are means ± SD (N = 6). min = minutes. Different letters indicate statistically significant differences (P < 0.05).
