Fig. 2.
Element concentrations (μg mg−1) and N:P ratios in shoots of Pedicularis rex and P. tricolor (as indicated in the key). (A) Shoot concentration of nitrogen (N), (B) shoot concentration of phosphorus (P), (C) shoot concentration of potassium (K), (D) shoot concentration of calcium (Ca), (E) shoot concentration of magnesium (Mg) and (F) shoot N:P ratios. Data are presented as the mean ± s.e. of four replicates. Statistical analyses were performed separately for the two Pedicularis species. *Indicates a statistically significant difference at the P < 0·05 level; **indicates a statistically significant difference at the P < 0·01 level. Treatments (nutrient solutions based on Long Ashton solution): N, nitrogen; P, phosphorus; K, potassium; ‘–’ indicates absence of the nutrient in the solution; ‘2’ indicates doubled concentration of the nutrient in the solution.