If you are unsure of the provenance of your manure this seems reasonable. I use the dung from my horses almost hot with no ill effects but I know what they eat and what contaminants are about. And they always wash their hands ...er hoofs afterwards.
Nah, it's nature's packaging. Also one should consider that the longer it lies around the more nutrients are lost due to leaching and volatility
David
Good point, the phosphates and potassium are subject to being carried away by surface water during rains, and if not interred and sequestered by soil moisture, the ammonia (NH3), a by product of the break down of the amino acids, from the proteins (dead bacteria) in the manure, would escape into the air and be lost to the soil. This is why side dressing is less efficient than turning the manure into the soil. In lasagna gardening, the manure is cast on the unturned soil and covered with mulch, which provides the moisture necessary to sequester the ammonia.
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