A few years ago I encountered a book several decades old at that time (I
think a Dover reprint, can't remember title or author, just possibly
Aldo Leopold's "Game Management") which showed pictures of conifers (I
think white pine or white spruce) grown in Wisconsin with and without
black locust. The conifers grown with black locust grew much faster.
Around 1980 I read an account of some Russian work (possibly from
somewhat earlier, 1969?) which reported that poplars grown with caragana
grew faster.
I have been told that dwarf hackberry in the Niagara Peninsula here show
a growth spurt a few years after planting which is due to their picking
up helpful symbionts which grow in association with their roots,
producing root proliferation. I don't know if they fix nitrogen or not.
Doug Woodard
St. Ctharines, Ontario, Canada
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