tntfarm - 1/23/2026 11:22

In the OP example, with an Olsen of 4ppm, assuming little stacked residue, simply because the nutrients would not support lush growth, the pool of nutrients for the next crop is from the pool measured by Olsen and the decaying CRP residue. The OP options are to apply P at an aggressive rate or "let the biology do the work" Soil health warriors claim that good biology can pull P from the untapped reservoir, but I have not been able to do it "here".
So, I don't need to discuss it, I simply want to find the resource to explain the process to me.[/QUOTE

There's a big difference between what shows up on your P1 Bray and what biology is doing. The P1 Bray is the chemically extractable pee at that moment , it doesn't tell us much about biological activity . And it is even less relevant to telling us what the plant is going to be doing.

Farmers don't " claim" that biology can pull phosphorus from the geological pool and bring it to the available pool. They are simply stating basic soil science. That is how biology functions that is how our soils functions, there is no refuting that.

So you haven't been able to pull from the untapped phosphorus pool. How did you measure that?

What biological product did you use?
How did you test them for success or failure?
How often did you do soil tests and plant tests throughout the season between the treated and untreated areas?