Local Manure with bark chips
So I've found a local source that has a lot of well rotted horse manure to give away for free. Perfect for the allotment, I thought. They said that they use bark chips from the local tree surgeons which then rot down nicely (I assume as bedding for the horses). So my only concern is that the trees must have been untreated as I don't want to end up eating pesticides. But how would I tell? Or is it irrelevant if the manure is well rotted, would pesticides have leaked out?