Empty the whole tank across one revolution.
Float rides high in denser fluid. Correct upward.
Revise down so the tank never runs dry early.
This is the fixed illustration behind every number the tool produces. The density-corrected rate (1,689 L/h) would empty the tank exactly on time — but the margin of error revises the dial downward, never up, because running out of product mid-pass leaves a strip under-fertilised, while finishing slightly late just puts the last litres on at the end. At −5% the safe set-point is 1,605 L/h, and the tank lasts ~13.2 h against a 12.5 h pass — a small deliberate overrun. Section 03 applies the same derate to every pivot; the tank builder at the bottom does it for any one-off mix.
Concentration-aware, per salt. Every salt carries its own density curve — density rises with concentration along a fitted slope, not a fixed factor. In a mix, each salt's density-excess over water is evaluated at its own concentration and the excesses are summed. So a salt at 400 g/L contributes nearly double the density lift it would at 200 g/L, and the model bends correctly across the range instead of pivoting around one point. AMS is verified exact at 100, 200 and 300 g/L; the honest residual is a fraction of a percent well past your working range.
Temperature. The model adjusts water density for your tank temperature and nudges the estimate accordingly. A cold AMS tank is denser, which pushes the float higher and the dial up — the safe direction.
What it still can't do. Salting-out — where one salt forces another out of solution earlier than either would alone — is ion-pair-specific chemistry with no clean general formula. The tool flags combined load risk conservatively (summed fraction of each salt's own solubility) rather than predicting an exact crash point. When the combined-load bar climbs, treat it as "test before you trust," not a precise limit.
Ground truth beats all of this. A weighed litre of the actual mixed stock (enter it in "Measured density" on the tank builder) overrides the whole model. And a bucket-and-stopwatch on the injection line sidesteps density entirely by measuring real litres/hour. Density correction is a prediction; the bucket is measurement.
| Timing | Growth stage | Products (co-dosed in one tank) | Stage total |
|---|---|---|---|
| Season total nitrogen | — | ||
| Spilpunt | Area (ha) |
Tank (L) |
Run (h) |
Bagged mass this stage (kg) |
Fills needed |
Bags / drum (500 kg) |
Rate to match run (L/h) |
DIAL TO (−5% applied) |
N this stage (kg/ha) |
|---|
Bags / drum = how to load the bulk products (500 kg bags) across the pivot's physical 10,000 L drums, split as evenly as possible (e.g. 5/4/4 = 5 bags in drum 1, 4 in each of the others). Drums are drawn in parallel, so hydraulically they're one pooled tank — density, dial, and fills are computed on the combined volume. Bulk products round to the nearest 500 kg bag and every figure here uses that rounded mass; the N/ha column reflects the actual bagged amount, which lands within a few percent of the programme rate. Micro-nutrients are dosed loose (counted in density, not bagged). Fills needed = separate mix-and-run cycles if the pooled load would exceed the dissolve ceiling (90% of the tightest salt's solubility); the bag pattern shown is per fill. DIAL TO is the density-corrected rate revised down by the safety margin so the tank never runs dry early — set the float here.
Use this for a corrective feed or any tank not driven by the season programme above. Add the products and mass you're putting in, and it returns the blended density, saturation check, and the dial for a chosen run-time. The programme planner (03) is the tool for your normal season passes.