Recommend striking this sentence now that the difference rounds to zero. If we wanted to provide a specific example that supports the previous sentence about legacy P, could include some info about the relative contributions of "soil" vs. "applied P" to the surface soil total P we calculate in the P Index, which is an important part of the particulate P calculations.
Picked one "baseline" example. This is where we fall apply fertilizer at a rate equal to crop removal on St. Charles SiL with 50ppm STP:
Surface soil **total ** P concentration is 420 mg/kg, which breaks down to ...
- 12 mg/kg from the fertilizer application
- 408 mg/kg from the soil (calculated with the nonlinear equation we looked at together last week using STP and SOM)
This particular example is on the low end of what we would see for the contribution from applied nutrients because our baseline "fall chisel disk" tillage system has incorporation passes in the fall and spring that leave very little amendment P on the surface.