Put your soil test in and this page works through it in order: what is actually in your ground, how much of it a root can reach this season, what your current program really delivers, and the four ways of changing that. Rates come at the end — after the reasoning, not instead of it.
Every figure on this page comes from these. Change one and watch what moves — that is the point of the exercise.
These three do not change the phosphorus story on this page — that is set by your pH, soil test P, organic matter and CEC above. They are here because they change the nitrogen figures and the wet-soil case further down.
Soil test not to hand? — useful for seeing how this works, but get the real numbers before you spend anything.
A soil test measures what a chemical extractant can pull out in a few minutes. It was never designed to measure how much phosphorus your field contains — only to rank how likely the crop is to run short. The rest is real, and it is large.
Phosphate in solution or loosely held — what a root can reach over this season. Measured, not estimated.
Locked inside residue, roots and humus. Releasing it needs enzymesBiological scissors. They cut phosphorus off the organic molecule it is attached to, turning it into the orthophosphate form a root can actually absorb., not acid. Estimated from your organic matter.
How enzymes free it →Reacted with calcium, iron or aluminum into compounds a root cannot take up. Every pound you have ever applied and not removed is in here. Estimated.
How it is freed →Phosphate is reactive. Put it in soil and it finds something to bond with within days. Which element grabs it is set almost entirely by your pH — and there is a narrow window where neither side wins.
Put your current rates in. This is not about whether you are applying enough — it is about where it ends up.
This carries no phosphorus. It is here because it is the pass a phosphorus product can ride along on.
Only four things can be done about phosphorus. We make products for three of them, and the fourth is free. What follows is judged on the numbers you entered — where something does not fit your ground, it says so.
The same agronomic model our agronomists run in the field. It returns rates and it will tell you when a product does not belong on your acres.
These are indicative end-user prices, not a quotation — what you actually pay depends on your retailer, your volume and your season. Put your own quoted figures in and everything below follows them. Set any of them to zero to hide that product's cost.
This is the field model, not a quotation. Rates come from the product labels and the trial base; soil-test interpretation uses Mehlich-3 and regional loss parameters. Your soil, season and placement will move every number here — confirm the program with your agronomist before you buy anything.
We will email you this page's figures for your ground, and the trial data behind them as new results come in. No rep will call unless you ask for one.
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