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Now I am lucky enough to have access to large quantities of cow manure
QuoteNow I am lucky enough to have access to large quantities of cow manureDon't want to scaremonger but from my experience this type of manure is highly prone to containing aminopropylid. Farmers tend to use this weed killer on grazing land to kill broad leaf plants as it is safe for grazing animals. The problem arises when the animals excrete the faeces,I.e. The stuff you might be using!By law farmers are supposed to tell any third parties he has used the weedkiller on his land before he may pass the manure on!For peace of mind it you might be best advised to ask him the question " has he or has he not used aminopyralid weedkiller on his grazing land"?
Perhaps the issue is TIME. If the processors will not allow long enough for a proper composting process, the time available for herbicides like Aminopyralid to break down is also reduced.