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Soil Potassium-Moisture Relations: III. Determining the Increase in Exchangeable Soil Potassium on Drying Soils¹

ABSTRACT

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:

NH₄OAc > 0.5N HCl > 0.1N 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.

¹ Journal Paper No. 3438 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa. Project No. 1234. Presented before Div. II, Soil Science Society of America, Lafayette, Ind., Aug. 5, 1958.

² Associate Professors in Soils.

Received for publication June 13, 1958. Accepted for publication October 30, 1958.