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A Rapid Method for Measuring Lime Requirement of Red‐Yellow Podzolic Soils
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1962
Year
EngineeringSoil MechanicsLand DegradationSoil StabilityRapid MethodSoil BiochemistrySoil CharacterizationSoil PropertyEnvironmental ChemistryRed‐yellow Podzolic SoilsSoil PropertiesBiogeochemistrySoil PhSoil ScienceSoil Physical QualityMeasuring Lime RequirementEnvironmental EngineeringSoil ChemistryEnvironmental RemediationSoil SamplesPercent Base Unsaturation
Abstract The exchangeable acidity determined by neutral 1 N NH 4 OAc was compared to that measured in a buffered solution on 348 soil samples from profiles of Red‐Yellow Podzolic soils in Alabama. The soil pH values ranged from 4.1 to 6.5 and cation‐exchange capacities from 0.8 to 13.0 me. per 100 g. The methods measured comparable amounts of acidity. An equation was calculated by the method of least squares for the relationship between soil pH and percent base unsaturation for all samples. The amount of CaCO 3 needed to bring soil pH to desired level was calculated by estimating percent base unsaturation from soil pH values in water and by measuring exchangeable acidity of soil by pH values in a buffered solution. The validity of this procedure was tested by incubating soils with increments of Ca(OH) 2 and measuring the change in soil pH.