wrote in message
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On Sun, 24 Jan 2010 11:40:03 +1100, "Rod Speed"
wrote:

What's wrong with just a sheet of plastic to stop the soil drying out ?

Plastic stops the soil "breathing"

Plastic is also the material you use to solarise your soil. By that I meant
hat you use the plastic to heat up the ground to kill weeds. It would do
the same to lettuce.