Tuesday, November 6, 2007
194-20

Nonexchangeable NH4 Fixation and Release Dynamics in Selected California Decomposed Granite Substrates.

D.E. Rider1, M.J. Curtis1, and Vic Claassen2. (1) Land, Air and Water Resources, University of California, Davis, One Shields Avenue, Davis, CA 95616-8627, (2) University of California-Davis, 2446 Bucklebury Rd., Davis, CA 95616

Layer silicates are known to "fix" ammonium within non-exchangeable interlayer spaces, but the re-release of these cations is not known. This study estimates the release rate and bioavailability of "fixed" ammonium.

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