Figure 5.

K⁺ tissue content of seedlings grown at five external K⁺ concentrations (as indicated, in mm) and two N sources (10 mm NH₄⁺ or NO₃⁻). Root content is represented by white bars, shoot content by gray bars, and whole-plant content by black bars. Error bars refer to ±SEM of six to 12 replicates. Root contents are expressed per gram root, shoot contents are expressed per gram shoot, and whole-plant contents are expressed per gram total tissue.