Inconsistency.

One of my chief reservations in relying on manure as a fertilizer source is the problem of inconsistency. There is just no way to know how much N or P2O5 is getting on the field. I can estimate based on general numbers that I know for feedlot-fed cattle manure, I can even pull samples to get them analyzed, but the fact remains that no two loads of manure will have the same composition. Clearly the manure (if it is even appropriate to call it manure) load centered in this picture is of much lower quality than the surrounding loads. This means that there will be five acres of ground which don't get near the nutrition of the surrounding acres. Boo!