"Glenna Rose" wrote in message
news:fc.003d0941023deab53b9aca00146ee4be.23deabe@p mug.org...
writes:
clear plastic mulch gets very hot; much hotter than black mulch. in
fact, it's used to sterilize the soil and get rid of weed seeds,
verticilium, etc. I've tried it, but i can't find any clear plastic
that survives a summer of solar exposure. anyway, be careful with your
poor beans or they'll be precooked.

That is exactly what I use to kill weeds. I read about it in our local
paper many years ago. Works best if all vegetation is cut back and
removed (I used it to sterilize a weed-filled lawn the first time).

Sprinkle the area to moisten the soil if it is dry. Cover it with clear
plastic, 4 or 6 mil, and fasten all edges securely to the ground to allow
no air to escape. If you weight down the plastic in the middle, where the
weight is will not be completely sterilized as that area is shaded so keep
that to a minimum. The length of time it takes to do the job is dependent
on the weather. I have always left it down a minimum of two months. The
clear plastic allows the sun through and germinates the seeds. It also
holds in the moisture and encourages germination of all seeds. Depending
on the soil condition and the heat, it will cause all seeds an inch or
deeper to germinate. When you remove the plastic, do not disturb the soil
as cultivating it will turn up deeper soil where the seeds may not have
been affected. If seeds 2 inches deep have all sprouted with the
seedlings superheated and died then turning the soil three inches down
brings up a new crop.

The first time I did this, I left the plastic down all summer, in the fall
removed the plastic, seeded the lawn and had a beautiful weed-free lawn
next spring!

It's a safe and chemical-free way to do a job that isn't possible any
other way. Things like Roundup only get what's living at the time.
Because the critters in the soil can move away from the superheated soil,
they are left chiefly undamaged and your earthworms, etc., will return
when the soil temperature returns to normal.

Glenna

To add to your technique:

http://hgic.clemson.edu/factsheets/hgic1261.htm