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Soil Lime Requirement by Direct Titration with a Single Addition of Calcium Hydroxide

Dep. of Crop and Soil Sciences and Agricultural and Environmental Services Labs., 2400 College Station Road, Univ. of Georgia, Athens, GA 30602

View larger version (29K): [in a new window]   Fig. 1. Titration of five soils with 0.022 M Ca(OH)2 in water or 0.01 M CaCl2. Units of Mg ha–1 CaCO3 were calculated from mL Ca(OH)2 as described in Materials and Methods.

View larger version (17K): [in a new window]   Fig. 2. Comparison of titration slopes (pH/Mg CaCO3/ha) determined by linear regression of all titration data points to pH 6.5 in 0.01 M CaCl2 and all titration data points except the first in deionized water.

View larger version (20K): [in a new window]   Fig. 3. Comparison of titration slopes (pH/Mg CaCO3/ha) in water determined by regression of all data points to pH 6.5 except the first vs. slopes calculated from two data points [0 and 3 mL Ca(OH)2].

View larger version (20K): [in a new window]   Fig. 4. Comparison of titration slopes (pH/Mg CaCO3/ha) in 0.01 M CaCl2 determined by regression of all data points to pH 6.5 vs. slopes calculated from two points [0 and 3 mL Ca(OH)2].

View larger version (22K): [in a new window]   Fig. 5. A comparison of LR (Mg CaCO3/ha) based on an initial pH in water and slopes determined from two point titrations in 0.01 M CaCl2 [0 and 3 mL Ca(OH)2] extrapolated to pH 6.5 vs. LR from the 3 d Ca(OH)2 incubation.

View larger version (22K): [in a new window]   Fig. 6. A comparison of LR (Mg CaCO3/ha) based on an initial pH in 0.01 M CaCl2 and slopes from two point titrations [0 and 3 mL Ca(OH)2] in 0.01 M CaCl2 extrapolated to pH 6.5 vs. LR from the 3-d Ca(OH)2 incubation.

View larger version (19K): [in a new window]   Fig. 7. A comparison of LR (Mg CaCO3/ha) based on an initial pH in 0.01 M CaCl2 and slopes from two point titrations [0 and 3 mL Ca(OH)2] in 0.01 M CaCl2 extrapolated to pH 6.5 vs. LR by the Adams-Evans procedure with a target pH of 6.5.