Fig. 2. (a) Cumulative root emergence and coefficient of velocity of root emergence (CoV_E) of Brown Loam (BL), and the Al-resistant Cycles 1 and 2 (BL-AlR-C1, BL-AlR-C2) and susceptible Cycles 1 and 2 (BL-AlS-C1, BL-AlS-C2) white clover populations derived from it, at two levels of soil pH and resistance index, indicating Al resistance, of those characteristics at pH 4.18. (b) Cumulative root emergence and CoV_E of Huia (H), and the Al-resistant Cycle 1 (H-AlR-C1) and susceptible Cycle 1 (H-AlS-C1) and acid-soil-resistant Cycle 1 (H-ASR-C1) white clover populations derived from it, at two levels of soil pH and resistance index, indicating Al resistance, of those characteristics at pH 4.18. Symbols within characters followed by the same letter are not significantly different at the 0.05 probability level. Vertical axis scales have been adjusted so that standard error bars for both characters are approximately equal in size.