Healthy soil and sustainable growing

[Harvey Ussery <huboxwood@earthlink.net>]

As said in an earlier post, am writing an article on soil building/care 
for Mother Earth News. There's something I read somewhere to the effect 
that, with reference to mineral content of soils, there is enough for 
"one hundred thousand years of agriculture"--the challenge is bringing 
it up from the depths thru use of deep-rooted fertility and cover plants 
like comfrey and alfalfa. Has anybody seen that statement? I thought it 
was in EDIBLE FOREST GARDENS, but I have scoured my copy and have not 
found it. Googling has also not helped. Would greatly appreciate being 
pointed to that quote if anyone knows it. Thanks.

~Harvey

--
Harvey in northern Va
www.themodernhomestead.us