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dc.contributor.authorLiu, Min
dc.description.abstractPrevious studies about the titration curves of acid soils reported a linear relationship in the approximate range 4.5 < pH(H2O) < 6.5. It appears possible to establish the slope of the titration curve with 3 aliquots of Ca(OH)2 and then predict the lime requirements (LRs) to pH 6.5. The objective of this study was to evaluate the possibility of developing a direct titration procedure to measure the LRs of acid soils for routine use in soil testing laboratories. Seventeen soil samples with a wide range of clay and soil organic carbon contents were collected from five of the major land resource areas of Georgia. A 30 minute interval time between additions was found to be relatively short but adequate for the base added to react with the soil acids. A 3-day Ca(OH)2 incubation study revealed that the 3-points prediction from the direct titration with 30 minute interval time between additions estimated approximately 80% of the soil acidity. To simplify the procedure, one dosing of Ca(OH)2 was also tried to establish the titration slope in both water and 0.01 M CaCl2. Although the 2-point titration in water was subject to errors, the two point prediction of the LRs in 0.01 M CaCl2 estimated approximately 83% of the soil acidity. The CaCO3 incubation was found to overestimate the LRs. The LRs were highly correlated with initial pH and total carbon content.
dc.subjectLime requirement
dc.subjectSoil testing
dc.subjectSoil acidity
dc.titleDirect titration for measurement of soil lime requirement and indirect lime requirement estimation by soil properties
dc.description.advisorDavid E. Kissel
dc.description.committeeDavid E. Kissel
dc.description.committeeMiguel Cabrera
dc.description.committeePaul Vendrell

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