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Published in Soil Sci Soc Am J 23:363-364 (1959)
© 1959 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Release of Fixed Potassium as a Diffusion Controlled Process1

M. M. Mortland and Boyd Ellis2

ABSTRACT

Rate of release of fixed K from vermiculite with 0.1N NaCl was studied to attempt to characterize the ratelimiting process. Of the processes considered, film diffusion satisfied most criteria as rate limiting. The activation energy of the release of K by 0.1N NaCl in the system studied was about 3,550 cal./mole, a value of the order frequently obtained for diffusion processes.

NOTES

1 Authorized for publication by the Director as Journal Article No. 2402 of the Michigan Agr. Exp. Sta., East Lansing.

2 Associate Professor and Instructor in Soil Science, respectively.

Received for publication March 20, 1959. Accepted for publication March 27, 1959.






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