permaculture

[sinergyinaction@netscape.net]

Hi, 
are there specific techniques for soil preparation before planting trees in 
(heavy) clay, almost flat, soils?
I have seen a web site where Darren Doherty uses some special machinery to 
produce earth mounds and successively plant trees on top of these mounds.
Is this technique always advisable, sustainable etc? (provided one has the 
right machine of course)
Cheers
Antonio
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