Fig. 3. Regression of log of herbage mass plant^–1 vs. log of plants m^–2 as influenced by P (A) and K (B) fertilization in Harvest 1 (May) of 2000. Slopes of regression equations designated with the same letter are not different (P < 0.05). Data presented in Fig. 3A are averaged across the K fertilizer treatments, while data presented in Fig. 3B are averaged across the P fertilizer treatments.