Fig. 1. Experiment 1 mean soil:water pH (1:1) (pHw) values (soil pH of 1:1 H2O:soil suspension) at 0 to 5 or 5 to 10 cm soil depths as affected by CaCO3 application rate. Predicted linear response to application rate is shown for the 0 to 5 cm (solid) or 5 to 10 cm (dashed) soil depths. Each symbol represents the mean of three repeated measures (taken 6, 12, or 23 mo after treatment).