ATTENTION ALL HORSE OWNERS: “… how did these chemicals turn up in the compost? In early August 2012, CSWD identified area horse farms as the source of the contamination and sent letters to those farms indicating it could no longer compost their manure. Puzzled as to how the herbicides had gotten into the manure, CSWD asked those farms to indicate which commercial horse feed they had used, and then took the bold step of having samples of that feed tested.”
Read more: http://www.motherearthnews.com/organic-gardening/herbicide-damage-zmgz13fmzsto.aspx#ixzz2LpK28SnM