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Published in Soil Sci Soc Am J 21:501-504 (1957)
© 1957 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Potassium-Moisture Relations: II. Profile Distribution of Exchangeable K in Iowa Soils as Influenced by Drying and Rewetting1

J. J. Hanway and A. D. Scott2

ABSTRACT

Exchangeable K was determined in "moist," air-dry, and oven-dry samples from profiles of different Iowa soils. All moist subsoil samples contained low amounts of exchangeable K. Drying increased the exchangeable K in all of the samples, but in general, the subsoils released more K on drying than the surface soils. Thus, the profile distribution of exchangeable K depended upon the moisture content of the soil samples at the time of extraction.

No relation existed between the amount of K released on drying and the amount of released K that reverted to fixed form when the soils were subsequently stored under moist conditions. There was more reversion of K to fixed form in the Marshall profile samples and in samples from below 3 feet deep in the Carrington, Fayette, and Edina profiles than in samples from the upper 3 feet of these profiles. This indicates that greater reversion occurs in the least weathered material. In some cases reversion occurred in the oven-dried samples but not in the air-dried samples.

NOTES

1 Journal Paper No. J-3112 of the Iowa Agr. Exp. Sta., Ames, Iowa. Project No. 1234, Department of Agronomy. Presented before Div. II, Soil Science Society of America, Cincinnati, Ohio, Nov. 15, 1956.

2 Associate Professors in Soils.

Received for publication January 28, 1957. Accepted for publication April 2, 1957.






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