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ecmn | [You said if what I’m saying were true, there would be no correlation with soil test P to yield, plant response, or response to applied fertilizer.
It is true, I said no direct correlation, not zero correlation.
Can you show the dataset that says If your soil test is X, you will get Y yield?
Or If you apply X lbs of P, you will get X bushels of response?
Those equations don’t exist outside of deficiency.
Before we use the word mining, we need numbers.
What is the size of the geological P pool in your soils, and what is the annual rate of depletion?
Without those two numbers, mining is a belief, not soil science.
You mentioned differences in plant uptake at P1 values of 8 vs 25 vs 300.
Can you show the research that demonstrates a direct correlation between a soil test number and actual plant uptake?
Not probability of response, actual uptake.
You said P1 is the soil’s ability to provide P to the plant.
If that’s true, there should be a direct correlation between P1 and uptake, yield, or crop response.
There isn’t.
That’s why I say P1 is good for identifying red flags, not managing supply.
As long as the plant isn’t deficient, P1 doesn’t tell you much about what the plant will actually take up.
Edited by easymoney 1/13/2026 20:45
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Formula for converting p1 to available phosphorus?
