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Old 01-11-2013, 08:20 PM
44DCNF 44DCNF is offline
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Join Date: Jul 2007
Location: Northern Illinois
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Most Brassica species release chemical compounds that may be toxic to soil borne pathogens and pests, such as nematodes, fungi and some weeds. The mustards usually have higher concentrations of these chemicals.

http://www.extension.org/pages/18643...rganic-farming
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