Originally Posted by JDUtah
6.8 lbs N is quite a bit. Now you must understand that this number probably reflects total N. In which case, most of it will not be plant available the first year. (roughly 5 to 10% of N from compost is made plant available the first year, depending on the compost and/or maturity)
The amount of N available from a given compost varies widely
. Even if you were to put numbers on it, a generic first year availability might be more like 10-30% N available the first year, and that isn't even considering historical management and other natural sources of N (clipping return, N deposition, N fixation, etc...). Without knowing the breakdown of N in the compost or the site conditions, it is impossible
to make any informed management decision on N availability, much less put a number on it.