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CO2

Richard - It wouldn't be *that* hard to enhance the CO2 level over a patch.
The required amount is manageable using a CO2 cylinder, a  burner, or dry
ice as a source.  The trick would be containment -  a hoop greenhouse or
equivalent would be best, but a patch with a high plastic border might
work.  My thought is to go the low tech, low cost route.  At least CO2 is
heavier than air, so it will stick around with no wind.

Here is a simple calculation... Since 1 cubic meter of air weighs 1 Kg, .03
Kg of dry ice will produce a 3% CO2 atmosphere in that volume.   A 100
cubic meter patch requires 3 Kg of dry ice.  One Kg costs about as much as
a quart of milk.

Three percent is 30 times the concentration Will Neily mentioned wrt hot
house vegetables.  I picked 3% at random, figuring that most will waft away
from  breezes that penetrate the patch boundary.  In truth, it would
probably *all*  go, but you could try replenishing the dry ice every day.

As a side benefit, the CO2 might bother the rodents and bugs.

Will - any sense about the maximum productive CO2 concentration?

	Dan Shapiro
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