A couple articles exploring the possibility of lead in the soil around you home, which could potentially be consumed by your chickens:
http://www.portlandtribune.com/opinion/story.php?story_id=123801660877902600
http://blog.oregonlive.com/pdxgreen/2009/06/the_dirt_on_testing_soil_for_l.html
The Oregonain article had some useful resources in a sidebar that were not included on the page linked above:
Information on collecting soil samples:
http://www.umass.edu/plsoils/soiltest/soilbrochure2009.pdf
Interpreting your soil sample results:
http://extension.oregonstate.edu/catalog/pdf/ec/ec1616-e.pdf
http://www.portlandtribune.com/opinion/story.php?story_id=123801660877902600
http://blog.oregonlive.com/pdxgreen/2009/06/the_dirt_on_testing_soil_for_l.html
The Oregonain article had some useful resources in a sidebar that were not included on the page linked above:
Information on collecting soil samples:
http://www.umass.edu/plsoils/soiltest/soilbrochure2009.pdf
Interpreting your soil sample results:
http://extension.oregonstate.edu/catalog/pdf/ec/ec1616-e.pdf
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