Fig. 1.

Dry weight (DW) per plant of Pedicularis rex (A) and P. tricolor (B) after 13 weeks when grown with an individual of its own species and supplied with different nutrient solutions. Data are presented as the mean ± s.e. of four replicates. Statistical analyses were performed separately for shoot (above the line), root (below the line) and total DW of each plant. Bars for shoots (lower case), roots (upper case) and total DWs (in square brackets) with different letters indicate statistically significant differences at the P < 0·05 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.