Figure 1: Mean soil pH, soil exchangeable calcium (Ca), magnesium (Mg), potassium (K), and phosphorus (P) in cmol/kg and soil Ca:Al ratio with SE bars on lime-treated and control sites with model lines. Lime treatment was applied between 2003 and 2004 in central Pennsylvania. *Confidence intervals of the time-by-treatment interaction excluded zero, indicating a significant effect of liming on that variable.