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hydroponics



To All Sanetters,
	Something I never understood: how can soilless crop growth be economically
competitive with soil-full (?) crop growth?  What are the economic and
agronomic/horticultural advantages of growing crops within a controlled 
environment?  Have there been economic analyses of such comparisons?  I can
understand how such systems might be beneficial in cold, sunny climates to,
for example grow tomatoes, but how come I see hydroponically grown tomatoes
(albeit more expensive -- and uniform -- than their conventional counterparts)
in my local grocery store?

	Thanks for any insights.

-michel cavigelli