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A Rapid Method for Measuring Lime Requirement of Red‐Yellow Podzolic Soils
Author(s) -
Adams Fred,
Evans C. E.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600040015x
Subject(s) - soil water , lime , chemistry , degree of unsaturation , soil ph , cation exchange capacity , base (topology) , soil test , environmental chemistry , soil science , environmental science , chromatography , mathematics , geology , paleontology , mathematical analysis
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.