"Sacha" wrote in message
...


We keep repeating this on here but do read the past posts and press
information on manure from horses and cows grazed over fields treated with
weed killer. One of them - aminopyralid - passes through the animal
causing it no (apparent) harm but contaminating its manure. People using
it have lost their crops. Check with the person selling the manure that
the animals weren't grazed over land where that weed killer has been used.
Apparently, aminopyralid is slow to break down so the effects could be
felt for some years.


From
http://www.allotment.org.uk/garden-d...inated-manure/

"We know the Aminopyralid is eventually broken down by microbial action in
the soil and this is what we need to encourage.
If you have a manure pile and just leave it stacked, or even turn it over,
the relative lack of the right microbes means it could be two or three years
before it becomes safe to use."
The OP stated that he or she had "3 year old horse muck"

Therefore even if it was originally contaminated, in all likelihood, the
manure is by now safe to use.

Tom