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Diquat
is a herbicide that has been used extensively in the US
since the late 1950s to control both crop and aquatic weeds.
It is used on potatoes; as an aid in harvesting cotton,
rapeseed and other oil seed crops; to wilt and dry out silage,
standing hay, etc. for storage; a plant growth regulator
and sugar cane-flowering suppressant.
Paraquat is a quartenary nitrogen herbicide widely used for
broadleaf weed control. It is a quick acting, non-selective compound
that destroys green plant tissue on contact and by translocation
within the plant. It has been employed for killing marijuana in the
U.S. and in Mexico. It is also used as a crop desiccant and
defoliant and as an aquatic herbicide.
For a copy of EPA Method 549.1, click here
Click
to download a copy of a Horizon Technology Application
Note on EPA Method 549.1
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