History of Hydroponics

	Revision 4 . . November 15, 2001 6:35 pm by Dmerrill [explained more clearly why soil isn't necessary -- a plant can only use nutrients dissolved in its water supply, so by supplying the nutrients artificially the need for soil is obviated]
	Revision 3 . . (edit) November 15, 2001 5:13 pm by Malcolm Farmer
	Revision 2 . . (edit) November 13, 2001 4:22 pm by Malcolm Farmer [typos]

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