Fig. 1. (a) Effect of soil pH on root emergence across time from soil into agar 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. (b) Effect of soil pH on root emergence across time from soil into agar of Huia (H) and the Al-resistant Cycle 1 (H-AlR-C1), susceptible Cycle 1 (H-AlS-C1), and the acid-soil-resistant Cycle 1 (H-ASR-C1) white clover populations derived from it. Standard error bars, shown for two populations per graph, apply to all populations.