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Homegrown Weed Killer?

There was interesting short in the Sept. issue of The Avant Gardener about pulverizing dried marigolds (Tagetes minuta) and adding the powder to mulch spread over growing beds.  According to research in India, the marigolds kill weeds such as barnyard grass and purple nutsedge.  Does anyone know about this study or have further information?
Doreen Howard
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