Don't have the citations handy, but for this and many other chemicals 
the runoff rates vary by orders of magnitude depending on soil type.  I 
reviewed the available literature pretty thoroughly in the early 
eighties and that was clear then.  Surely there is more research now. 
There may also be effects from the "inert" ingredients on soil macro and 
microorganisms (like the nitrogen fixing bacteria in clover and other 
legumes).  Also this study applies to surface water (usually streams, 
rivers etc), and many chemicals adsorb to soil particles, especially the 
very fine clays.  If they reach bodies of water they are mostly in/on 
sediments.

More basic research please....the perpetual plea....

Carolyn in SC




On 6/14/2010 12:49 PM, Paul Cherubini wrote:
> http://tinyurl.com/y8sysjv
>
> "only limited amounts of glyphosate move to surface water as runoff.

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