I don't know.
You want a sample of the stuff tested. You want to know how much N, P, & K you are buying. Amount of water will have a big impact on what you are getting. The different types of manure will tend to have different levels of fertilizer, and be worth more or less to you. I am not familar with the stuff so can't tell you which tends to be what.
Typically the manure itself is about free, but the cost is in loading it, and hauling it. It is difficult to haul very far.
Typically you will get _way_ too much P on the ground if you put enough tons per acre to get enough N for a corn crop. The govt is getting pretty testy about this, and if you don't already have rules about this, you soon will. We need to test our soils here in MN and apply manure so as not to build up the P too high. Just something to be a ware of.
This web site is one of many that might help you, it has a chart of common fert values from the different types. According to that, 2 tons an acre would be as much P as I could use; and 3-4 tons would give me all the N I would want if no one kills me over the P issue. Typically here you put on fertilizer for corn, the following year the beans use what is left so you are applying fert for 2 years at a time.
Incorporate it! Much better.
Manure typically has a multi-year factor, some of the N and any left over P & K will be around for next year. Typically N goes away, but manure will gibe you 10-25% N the following year as well.
D'oh, almost forgot the site:
http://www.ext.vt.edu/pubs/poultry/424-034/424-034.html
--->Paul