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Where to get soil data
For those of you in the U.S. that followed the soil-related threads and are
interested in looking for good soils near you to use in your substrates,
a great launching spot is the Iowa State University's Soil Survey Division
pages:
http://www.statlab.iastate.edu/soils/soildiv/
From there, there is more than enough information about soil classification
and regional surveys, as well as information on who to contact to find out
what types of soils are near you and where to find them. If you're gung-ho
enough, there are datafiles you can download or order that to complement
survey maps telling you about the composition and characteristics of the soil
you're standing on.
If you're not in the U.S., I can't help you right away except to tell you
how I bumped into that site, and maybe you can find other paths to similar
information about your area. I worked my way to the Natural Resources
Research Information Pages at the Department of Forestry at Virginia Tech,
which has a listing of local, national and international databases:
http://sfbox.vt.edu:10021/Y/yfleung/forlit.html#data
I notice a "Soils of Canada" entry among a few other International sites. Take
a look at the site above if you're interested.
-Carlos