Greetings chemist dudes:

I've got a tattoo of the periodic table on my left calf, but organic
chemistry I just cannot get into. So here's my question, which has
been the subject of another Google question, now
closed(http://answers.google.com/answers/threadview?id=508121):

What destroys glyphosate (Round-up)?

I can mix-in activated charcoal I've found out, but is there a
by-the-bag crumbled bread mold or easier chemical solution like
hydrogen peroxide? Something off-the-shelf like calgon?

I'm hoping one of you will look at the chemical formula and think,
"oh, decomposes with papain, pepsin or shout" or some such thing.
http://www.agron.iastate.edu/~weeds/Ag317/manage/herbicide/ATgly.html

I'm curious as to why you wish to deactivate Roundup, it would
probably help to answer the question more effectively. However, going
on the idea that you are looking at deactivation as meaning a complete
reduction or nullification of the efficacy of the product (for its
intended use) the simplest way (aside from building a makeshift lab in
your basement) is to simply mix the glyphosate with water that has a
high silt content. Alternatively, if you have access to very hard
water (high Mg and Ca content: >700ppm and 500ppm respectively) you
can use that instead of silty water.

I still wouldn't put the stuff on my Cheerios though.

It won't do much good mixing it with activatyed charcoal; the charcoal
absorbs glyphosate, but it doesn't destroy it. The best thing would be
to burn it, it decomposes at 230C.

Isn't there a place you can deliver chemicals for proper destruction?

I know there was a genetically engineered soybean modified to resist
Roundup sold by Monsanto, and rumor (unconfirmed) has it that coca
farmer are using the same gene mod in coca plants to resist American
efforts at controlling drug supply by spraying Roundup.... but I don't
know the mechanism of resistance.
Point being, the plant may produce an enzyme that breaks down or
blocks action of the chemical. It's unclear precisely what you're
looking for; if you just have a supply of it, high temp should destroy
it, but do you really want to do that?

No takers?

Another thought I had was that something like urea could be used, or ammonia.

Okay, it looks like this one is going to expire unanswered, but thanks
for the suggestions and comments.

There are probably a handful of uses: like I mentioned in the original
post of this question, I am apparently not the only one to have sod
and seed  lawns die after a year following a thorough kill and bags of
amendment.

Plus, it might make a peachy prize to submit to the Btranson Yahoo
contest, yes? We'll call it "Round Two."