Jeff,
        Have you tried using a coffee grinder? It should work better on DRIED
plant material. Good luck!

Jose





At 12:05 PM 8/10/99 -0400, Julia Cox wrote:
>Jeff,
>
>We grind plant and soil material using glass jars with teflon lined caps
>(Qorpak), stainless steel rods, and a tumbler.  The rods are 3, 5, and 6
mm in
>diameter and 2.5 cm long.   The rods are added to the jars in a ratio of
3:2:1
>(small:medium:large diameter); the total number of rods to use depends on the
>size of the jar and amount of sample.  We tumble the samples at a rate of
about
>40 rpm for 20 min to an hour or more.  Our tumbler comes from U.S. Stoneware.
>
>Reference:  Kelley, 1994. Conveyor-belt apparatus for fine grinding of
soil and
>plant materials, Soil Science Society of America Journal, v. 58, p. 144-146.
>
>Julie
>

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