[Market-farming] venting low tunnels
wshoemak at illinois.edu
Fri Dec 18 12:05:38 EST 2009
If you buy the clear slitted plastic row tunnels, they can self ventilate if properly set up. The idea is that the tunnel material should be applied, or rather stretched, over the hoops tightly and without any twisting of orientation of the plastic. The tight stretching should facilitate closure of the slit vents. When done properly, the slit channels will be closed in cool, cloudy conditions. As the sun comes out and conditions warm up, the air inside the plastic expands and the slits open up, especially as heat builds inside and pushes air against them. I've done it multiple times and it works pretty well if set up properly.
Its not perfect and in warm climates, if used too late in the season, the temps still get too warm inside the tunnels. They are really just a tool for very early season applications.
---- Original message ----
>Date: Fri, 18 Dec 2009 11:29:03 -0500
>From: "breck" <bcarden at breckinridgegroup.com>
>Subject: [Market-farming] venting low tunnels
>To: "'Market Farming'" <market-farming at lists.ibiblio.org>
> Ok folks help me out here.
> I have seen Coleman use plastic over low tunnels and
> it appears he is hand venting when necessary. Do you
> have any experience with low tunnels using some sort
> of automatic or self-venting system. Have you used
> slitted plastic? Auto openers? I am located at the
> Mason-Dixon Line and it can heat up fast in tunnels.
> Farmer Breck
> Breck Carden
> Carden's Garden
> 2400 E Hwy 22
> Crestwood, KY 40014-7704
> breck at breckcarden.com
>Market-farming mailing list
>Market-farming at lists.ibiblio.org
William H Shoemaker, UI-Crop Sciences
Sr Research Specialist, Food Crops
St Charles Horticulture Research Center
535 Randall Road St Charles, IL 60174
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