I have access to some fresh horse manure. I was thinking of spreading it over my veg plots after I remove crops and just turning it in lightly (to stop my dog rolling in it!) then digging it in next Spring. Would this be ok or should I leave the manure in a pile? I think I read somewhere that horse manure is highly acidic and shouldn't be used immediately. If so how long do I have to wait - any advice about the the best way to make use of it would be very welcome.