permaculture

[Jerome Rigot <jfrigot@gmail.com>]

Yes, but when doing a bioassay, one must use plants that are particularly
susceptible to herbicides, particularly the herbicide tested.

For example, for Clorpyralid, a persistent herbicide that can be found in
municipal compost, the most sensitive plants are red clover, sunflower,
peas, and tomato, which can then be used in bioassay (
http://ohioline.osu.edu/aex-fact/0714.html).

Peas, beans and tomatoes are particularly susceptible to aminopyralid. More
details about this herbicide and of the type of bioassay to perform to test
compost and even your soil for contamination:
http://whatcom.wsu.edu/ag/aminopyralid/

Jerome



On Thu, Aug 19, 2010 at 10:11 AM, paul wheaton <paul@richsoil.com> wrote:

> In the video, check out the raspberries.
>
> When you do a bioassay, you can get 100% germination in a soil that is
> tainted with persistent herbicides.  There is just enough herbicides
> to not kill, but to stunt the growth of your broadleaf plants.  So
> your plants still take up the herbicide - they just don't die.  Your
> food then contains herbicides.
>
> These types of herbicides generally have zero impact on germination.
> Their mission is to weaken the plant - usually by emulating the plant
> growth hormone auxin.
>
> Here is the blurb from the sales page for aminopyralid:  "translocates
> throughout the entire plant and accumulating in meristematic tissues,
> including the roots. It disrupts plant growth metabolic pathways
> affecting the growth process of the plant."
>
>
> On Wed, Aug 18, 2010 at 12:56 PM, Steven & Margaret Eisenhauer
> <eisenhauerdesign@earthlink.net> wrote:
> > Hello,
> > My understanding is that a sprout test will indicate if a medium is good,
> > bad or ugly. Herbicide residues will be indicated by fewer seeds
> sprouting
> > in the medium.
> >
> > -----Original Message-----
> > From: permaculture-bounces@lists.ibiblio.org
> > [mailto:permaculture-bounces@lists.ibiblio.org] On Behalf Of paul
> wheaton
> > Sent: Wednesday, August 18, 2010 10:56 AM
> > To: permaculture
> > Subject: Re: [permaculture] commercial compost and persistent herbicides
> >
> > This is an excellent test to see if the level of persistent herbicides
> > is high enough to kill your plants.
> >
> > This test does very little to tell you if there is a level of
> > persistent herbicides to stunt the growth of your plants or make them
> > more susceptible to getting sick.
> >
> > On Wed, Aug 18, 2010 at 8:52 AM, Steven & Margaret Eisenhauer
> > <eisenhauerdesign@earthlink.net> wrote:
> >> Hello,
> >> I have learned from various sources that one needs to look at every
> >> amendment with caution.  To evaluate whether compost is healthy or bears
> >> toxic residues one needs to do a sprout test.  Place seeds in between
> wet
> >> cloth or paper towel-unbleached and wetted with non chlorinated water as
> >> your control and then plant the same type and number of seeds in the
> > compost
> >> in a flat and keep moist. Just compare your sprouting percentage in the
> >> compost with the control and you will know whether the compost is clean
> or
> >> toxic.  The beauty of this test is that it only takes 3 - 5 days to
> >> complete.
> >>
> >> Steven Eisenhauer
> >>
> >> -----Original Message-----
> >> From: permaculture-bounces@lists.ibiblio.org
> >> [mailto:permaculture-bounces@lists.ibiblio.org] On Behalf Of paul
> wheaton
> >> Sent: Tuesday, August 17, 2010 10:06 AM
> >> To: permaculture
> >> Subject: [permaculture] commercial compost and persistent herbicides
> >>
> >> Many people think their commercial compost is great because stuff is
> >> doing better with it than their stuff did with cement-like dirt.  That
> >> compost probably has persistent herbicides in it that is stunting
> >> plant growth. But the only way to know for sure is to grow a bunch of
> >> plants next to same species/variety plants that are grown in compost
> >> that definitely doesn't have it.
> >>
> >> http://www.youtube.com/watch?v=GunQ9mB0ywU
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