Here's an excerpt from Davis' blog, which links to Colucci's study. It goes to show: Know the history of your manure and compost before you apply it to your garden.
Sue Colucci, area specialized extension agent for Henderson, Buncombe, and Haywood counties, is working with a farmer who is having problems with herbicide carryover in manure. She worked with him to perform the bioassay that I have described to you several times. She just published those results, with pictures, on her blog. I urge you to read this over and bookmark it so you can find it again. Here's the link:
Great job, Sue. Thanks!
This is a reminder to be very cautious about the use of manure and compost for your garden and farm. They can be wonderful additions to the soil; I personally use them all the time. But you need to know the history of the materials. ....Read the full article