Reaction equilibration from single-addition base titration and commercial ag lime efficiency for lime requirement determination
Thompson, John Samuel
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The University of Georgia makes lime recommendations using a single-addition titration procedure. An issue with the procedure is the reaction with soil from Ca(OH)2 addition does not reach equilibrium. The purpose of this research was to i) determine the time Ca(OH)2 treated samples reached pH equilibrium, ii) determine if a relationship exists between lime buffer capacity (LBC) estimated from a 30 min equilibration and the LBC estimated at a time the sample has reached pH equilibrium, and iii) evaluate the efficiency of five ag limes compared to reagent-grade CaCO3 on Georgia soils. All soils used for the titration study reached an equilibrium pH by 84 and 96 hours after Ca(OH)2 addition. The ratio of the equilibrated LBC/30 min LBC could be predicted from the 30 min LBC (r2 = 0.83). The ag lime study showed on average ag lime is 73% as effective as reagent-grade CaCO3 powder.