Jill writes
depends on the Hydroponics
There is the expensive what is used in commercial horticulture
and there is a very good set up that costs very little
ideal for the 3rd world but not been picked up and run with
- works on the basis of rain gutters or similar - a fair amount of perlite -
a solar pump - and some white and shiny plastic.
Unfortunately the only person to make this work extremely well is not in the
position to make this pay
but boy does it work

Please to note that in arid areas irrigation on sandy soil is
effectively low cost hydroponics.

Nothing revolutionary at all, the ancient egyptians did it.

--
Oz
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