Noxious weeds

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1. Weeds categorized by law as objectionable in a seed lot for commercial sale.

slide32.JPG

The pile of seed on the left is contaminated grain seed with weed seed mixed in;
the pile in the middle is the weed seed separated;
the pile of seed on the right has no contamination due to weed seed.
Source: http://www.ilri.org/html/trainingMat/Seed/sld_show/slide32.htm