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Extraction of Potassium from Soils by Sulfuric Acid
Author(s) -
Hunter A. H.,
Pratt P. F.
Publication year - 1957
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/sssaj1957.03615995002100060007x
Subject(s) - sulfuric acid , soil water , nitric acid , chemistry , boiling , potassium , extraction (chemistry) , ammonium acetate , correlation coefficient , mineralogy , inorganic chemistry , soil science , chromatography , environmental science , mathematics , organic chemistry , statistics , high performance liquid chromatography
Methods of extracting potassium from soils by use of sulfuric acid have been developed. The amounts of K extracted from several Ohio and New York soils by these methods were compared with those extracted by neutral 1 N NH 4 OAc and boiling 1 N HNO 3 methods as means of furnishing a reliable index to the “plant‐available” K of soils. Using H 2 SO 4 method 1, amounts of K were extracted which were highly correlated with amounts of K extracted from soils by cropping. The correlation coefficient thus obtained was significantly different at the 1% level from the coefficients obtained by using ammonium acetate or boiling nitric acid. The sulfuric acid methods developed are simple to use and, since an exact quantity of heat energy is furnished to the soil extraction system, these methods theoretically furnish a means of releasing a constant amount of non‐exchangeable K, due to breakdown of primary and secondary minerals, as well as the exchangeable K from a particular soil.