PO 33. Calculate manure application rates from manure analysis information.

Manure is a readily-available byproduct of livestock operations, and contains many nutrients that are essential to plants.  Manure contains several N pools, which can be separated into two main categories:

1. Ammonium N (may be listed as "inorganic N" on manure reports), or "fast N"
2. Organic N, or "slow N"

These pools behave differently in terms of N release for plant growth.  Ammonium N is readily-available, while organic N is less available and may take months or years to become available.  Thus, when calculating manure application rates, you must take into account the manure applied in prior years.

Although concepts of N availability over time are accepted in all states in the Northeast, actual N credits might differ from state to state.  Refer to Land Grant University guidance for state-specific recommendations.