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Re: I R capture

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Bill,

I have seen the studies that show that clear plastic leads to greater soil
warming than black plastic. One of the downsides of clear is that it allows
light in which can support weed growth. An answer to that are the new IRT
plastics (infra red transmitting), which give you more soil heating than
black along with no weed growth supported.

Recheck your data, or better still, run a little experiment. And be sure to
measure the soil temp at various depths, eh?

Frank Teuton----who notes that greenhouses aren't covered in clear for
nothing, and that shade cloth is typically black, yes it is.....but that
nice black compost under a clear plastic will get warm better than some
light sandy soil, yes it will....


>Once again, BLACK PLASTIC MULCH HEATS ITSELF,
CLEAR PLASTIC MULCH HEATS THE GROUND!!!!!

>And is perfect for preheating the ground in your raised bed.

*I must say, solar radiation and such has been a constant interest of
mine...
and as an R&D Engineer in light study, can say this is in error.

Garden studies have shown this to be incorrect also.  Black also stops the
light frequency which allows weeds to grow.  It is all converted to IR.  For
max heat.  Use black on soil, and clear slightly above it.  If you have
clear,
better than nothing.  Except for the weed issue, clear is very close, about
2
degrees lewss effective only.... The black may SEEM to be reradiating a lot.
This is true.  It HAS captured a lot more. This is excess, recapturabe, or
containable to a degree, with a clear cover.

Consider, black as much, inside a greenhouse, the greenhouse acts as the
clear
cover.  Now contrast that with a greehouse with clear much.  Which gets
hotter...
Bill
SF/9.5 but never warm.

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