A Review of the Pennsylvania Phosphorus Index ... - PennFuture

Thus in this example, the allowable application rate of manure P was sensitive to the PSC value.While no centralized repository of PSC values are available for review, based upon a personalcommunication with Dr Beegle, the WEP-based PSC values he has seen are quite a bit lowerthan the Book values. According to Dr. Beegle, the PSC Book values were set at the upperbounds of the expected PSC values so it was not surprising to him that the WEP-based PSCvalues were lower.140Allowable Manure Phosphorus(lbs P2O5/A)1201008060402000.8 (H) 0.6 (M) 0.4 (M) 0.2 (M)Phosphorus Solubility Coefficient (P-Index Rating)Figure 1. An example of the influence of the Phosphorus Solubility Coefficient on the allowableapplication rate of manure phosphorus. This example is adapted from Beegle et al (2009),Appendix 5, Scenario 3. The conditions are summarized in Table 1.Page 5