permaculture

["georg parlow" <georg@websuxxess.com>]

> Beware of allelopathy with poplars....
> I saw a poplar windbreak in New Zealand, there was a farm track between
> the trees and the farmers field  of sweet corn - the allelopathic impact
> of the poplars was the most dramatic visual example I've observed yet.
> Near the track germination was sparse and plants severely stunted (barely
> 18 inches high), the density and plant size gradually and uniformly
> increased with increasing distance from the trees and at 1 and half times
> the hight of the poplars into the field the plants were dense, lush and
> over 6 foot high. The sunflower crop on the other side had exactly the
> same phenomena.

i doubt that this is allelopathy, but would suspect nutrient competition won
by the poplars.

georg