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Determination of Available Potassium in Soils of Forest Plantations
Author(s) -
Leaf Albert L.
Publication year - 1958
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/sssaj1958.03615995002200050024x
Subject(s) - potassium , soil water , potash , extraction (chemistry) , chemistry , azotobacter , ammonium , environmental chemistry , soil test , agronomy , environmental science , soil science , chromatography , biology , organic chemistry , bacteria , genetics
Various soil biological and chemical tests were compared in respect to their suitability for predicting deficiency of potassium for red pine grown on soils of Wisconsin and New York. The biological tests were accomplished by the Azotobacter and Aspergillus niger methods. The chemical tests included extraction of soil by N NH 4 OAc of pH 6.9 and 4.6, extraction by N NH 4 NO 3 of pH 6.9 and 4.0, extraction by 0.4 N HCl, ignition of ammonium‐saturated soil followed by extraction with neutral N NH 4 OAc, and extraction with boiling N HNO 3 . The last method provided the sharpest distinction between potassium‐deficient and nondeficient forest soils as detected by the rate of growth and response of plantations to application of potash fertilizers.