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

Decay series for stable organic N in manure vary by animal type.  To determine the amount of N that will be available to the present crop, you must account for the N from the application of the present crop plus any residual N that will be available from manure applications in recent past years.  The table below provides the factors to estimate the N from the present application and from past applications.  The "present year" factor would be taken times the amount of organic N applied in the present year.  A "last year" factor of 12% indicates that an estimated 12 % of the organic N applied in the manure last year is expected to be utilized by the present crop (a year after application).  Therefore this factor would be taken times the amount of organic N applied in the manure last year.  A similar calculation would be done if manure was applied two years ago.

Cornell guidance for manure organic N release by animal type (Klausner, 1997, derived from work by Klausner et al., 1994