A clickable walkthrough of the Bizon fertigation calculator, using a worked tomato recipe on a two-part injector with acid dosing. Nothing here needs an account, and nothing you do is saved. Hit Start the tour and we'll point at each control and explain what it does.
Four screens, twenty-eight steps, about four minutes.
The calculator doses your products to hit these targets.
Growing Medium
Coco holds calcium and magnesium and releases potassium in their place, so recommended feed EC and the crop presets shift with the medium you pick.
The medium belongs to this space, not to a recipe. Tanks and source water are in Irrigation Setup.
Crop
Presets are starting points in ppm for the medium above. They load N-P-K and the key other nutrients, then the targets below are editable.
Recommended feed EC ≈ 2.4 dS/m for coco coir.
Targets
Target nutrient levels (final solution)
Saved Recipes
Set up your fertilizer or fertigation system.
Fertigation System
Everything downstream follows this choice. A reservoir gets one set of amounts to add straight to the tank; an injector gets a separate concentrate recipe per tank, at your dilution ratio. This walkthrough runs a two-part injector, because that is where the mixing instructions actually get interesting.
Growing Medium
Coco coir
Coco holds calcium and magnesium and releases potassium in their place, so recommended feed EC and the crop presets shift with the medium you pick.
Change it on Fertilizer Target RecipesSource Water
Measured nutrients (elemental ppm)
Each tank is a concentrate your injector pulls from at its dilution ratio. Keep incompatible salts apart so nothing precipitates: calcium in one tank, sulfates and phosphates in another. You assign fertilizers to tanks in the calculator.
Add your own products with their guaranteed analysis. They'll appear in the calculator's ingredient dropdown under "My Fertilizers".
Community Library
Add a Fertilizer
Other nutrients - percent by weight (leave 0 if none)
Your Products
| Name | N-P-K | NH₄ % | Urea % | Mg | Ca | S | B | Cu | Fe | Mn | Mo | Zn |
|---|
Hit your target ppm. Get exact dosages for your system.
Batch Settings
pH Adjustment
pH adjustment (acid) (optional)
Dosed through your Acid line. Change it in Irrigation Setup.
Ingredients
How to use this
| Fertilizer | N-P-K | Base element | Target ppm | Tank | N ppm | P ppm | K ppm | Concentrate | Per batch |
|---|
Concentrate is the strength to mix per tank. Per batch is what to add to that tank.
Resulting Profile
Concentrate Tanks
Mixing Guide
A free account keeps your targets, your setup, your fertilizer list, and your saved recipes. The calculator, the soil and water tools, and the rest of the Toolshop come with it.
What "optimization" means here
Most feed charts hand you grams per gallon and hope your water cooperates. That is backwards. Your source water already carries calcium, magnesium, sulfur, sodium and bicarbonate, and your fertilizers come in fixed ratios you cannot change, so the only real question is which combination of the products you already own lands closest to the profile your crop wants.
Bizon works the problem from the target end. You pick one nutrient per product to dial in exactly, the rest of that product's analysis follows in its fixed ratio, and whatever your measured water already supplies counts toward the target so the fertilizers only have to make up the difference. What you get back is the resulting profile against your targets, the weight to add to your actual batch size, and the order to add it in so nothing precipitates in the tank.
It handles reservoirs and watering cans, direct-feed injectors with multiple concentrate tanks, and batch tanks, in metric or imperial, with acid dosing sized against your water's alkalinity. The screens above are the real interface, filled with a worked example instead of your own numbers.