There is some discussion and sample scenes and trees in this thread:

https://groups.google.com/forum/?fromgroups=#!searchin/xsi_list/particle$20clumping$20technique/xsi_list/aI0Y77t9H2c/discussion

Should be good for a head start.

gray

From: softimage-boun...@listproc.autodesk.com 
[mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Byron Nash
Sent: Wednesday, February 13, 2013 09:29 AM
To: softimage@listproc.autodesk.com
Subject: Clumps and chunks of material

I am working on a shot where a large heavy object lands in a grassy area. I'd 
like to have nice crumbly dirt clods go flying when it impacts. So far I 
haven't gotten anything that makes the particles clump together. Momentum RBD 
gives nice results for rock like objects. I've tried some Lagoa approaches but 
can't get anything usable so far. Anyone have any tips on direction to head?

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