I didn't see the original post, but I might weigh in here....Yellow-poplar (which isn't a true poplar, but a member of the Magnolia family) pulls up Calcium and Magnesium from down deep in the soil profile, and sheds it with its leaves in the fall, thus enriching the topsoil with those bases.
Some members of the true poplar family are nitrogen-fixers, working
symbiotically with rhizobacteria to add nitrogen to soils.
Perhaps he was referring to one of those situations?
Eddie Earles
-----Original Message-----
From: Jon Place <jonp1@comcast.net>
Sent: Mar 17, 2009 6:10 PM
To: North American Fruit Explorers <nafex@lists.ibiblio.org>
Subject: [NAFEX] "nutrient pump role"
Doug, you referred to the "nutrient pump role" of poplar and box elder. Could you speak more about this? Do these trees cycle nutrients into the soil for other plants?
Thanks, Jon
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