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The effect of lime treatments on mean soil pH (a, b) over the course of the long-term liming experiment at Rothamsted and Woburn; four rates of lime were applied, the treatments were: control (⬤), low (○), medium (▾) and high (△). Rothamsted site: (a); Woburn site (b). * along the base of the x axis indicates a significant difference (P < 0.05) between the treatments; Along the top of (a) and (b) + marks the years in which lime was applied.
