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Recent Mechanical Cultivation of Lawns Enhances Lime Application Efficacy

^a Dep. of Crop & Soil Sci., The Pennsylvania State Univ., 116 ASI Bldg., University Park, PA 16802
^b Dep. of Crop & Soil Sci., Univ. of Georgia Agric. Exp. Stn., 119 Redding Bldg., Experiment, GA 30212
^c Rutgers, The State Univ. of New Jersey, Dep. of Plant Biology and Pathology, 59 Dudley Rd., New Brunswick, NJ 08901

View larger version (24K): [in this window] [in a new window]   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).

View larger version (30K): [in this window] [in a new window]   Fig. 2. Experiment 2 mean 0 to 6 cm soil depth (A) pHw values (soil pH of 1:1 H2O:soil suspension) and (B) pHKCl values (soil pH of 1:1 1 M KCl:soil suspension), or 6 to 12 cm soil depth (C) pHw, and (D) pHKCl values by CaCO3 application rate and antecedent cultivation procedure; 2 yr following treatment. For each graph pane (A–D), significant differences do not exist between means having overlapping error bars (Fisher's least significant difference, = 0.05).

View larger version (30K): [in this window] [in a new window]   Fig. 3. Experiement 3 mean 0 to 6 cm soil depth (A) pHw values (soil pH of 1:1 H2O:soil suspension) and (B) pHKCl values (soil pH of 1:1 1 M KCl:soil suspension), or 6 to 12 cm soil depth (C) pHw, and (D) pHKCl values by CaCO3 application rate and antecedent cultivation procedure; 1 yr following treatment. For each graph pane (A–D), significant differences do not exist between means having overlapping error bars (Fisher's least significant difference, = 0.05).