Fig. 2.

Root and shoot dry weights of (A) Dactylis glomerata and (B) Plantago lanceolata grown in isolation or competing with each other, as indicated. Root weights of competitors were derived from the allometric modelling of combined root weights measured in the experiment, assuming that both species responded allometrically to competition (Table 2). Each symbol represents a separate harvest and is the mean of three replicates. α and β values for isolated plants are given in Table 1; those for competitors, in Table 2. Diagonal grey lines show constant root : shoot (R:S) ratios from R:S = 0·2 (the lowermost) to R:S = 1, in 0·1 increments.