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Soil Potassium‐Moisture Relations: III. Determining the Increase in Exchangeable Soil Potassium on Drying Soils
Author(s) -
Hanway J. J.,
Scott A. D.
Publication year - 1959
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/sssaj1959.03615995002300010014x
Subject(s) - subsoil , potassium , chemistry , extraction (chemistry) , soil water , water content , moisture , soil test , environmental chemistry , soil science , zoology , agronomy , environmental science , chromatography , geology , geotechnical engineering , organic chemistry , biology
A comparison was made of different extractants for determining the increase in exchangeable soil K which occurs on drying the soils. Moist and dry surface and subsoil samples of 10 Iowa soil profiles were used. The amount of K released on drying as determined by the different extractants was in the order: NH 4 OAc > 0.5 N HCl > 0.1 N HCl > Morgan's solution when 10 g. of soil was leached with 75 ml. of extractant. The amount of K removed by the different extractants was linearly related and highly correlated irrespective of the moisture status of the soil sample, except in the case of some oven‐dry subsoil samples extracted with Morgan's solution. Apparently, some of the K that had been released to an exchangeable form on drying reverted to a non‐exchangeable form during the extraction of some subsoil samples with Morgan's solution.