Fig. 4.

Relative agronomic effectiveness (RAE) of phenotypes on yield calculated from grain weight as a measure of yield. The yield of each phenotype under P-limited conditions is represented as a percentage of achievable yield for the same phenotype under unlimited P conditions. Bootstrap analysis was used to estimate the standard error of the ratios, and random permutation tests of the analysis of variance (ANOVA) were carried out to analyse the influence of root hair length on dry grain weight ratios under P0 and P500 conditions (n = 1000). Error bars represent the s.e. Different letters across all treatments indicate significant differences determined by l.s.d. (P = 0·05). NRH represent no root hair phenotypes; SRH, short root hair phenotypes; LRH, long root hair phenotypes; and WT, the wild type.