Fertilizer calculator tour

A clickable walkthrough of the Bizon fertigation calculator, using a worked tomato recipe in coco 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.

Example fertigation recipe

bizonag.com/recipesSample data

Fertilizer Target Recipes

Set the ppm for the final feed.

Growing Medium

Growing medium

Fed like inert hydro, with the same crop targets.

The medium is saved with this recipe, along with its tanks (3 injector tanks) and water (Tap / City · City supply, spring). Change those in the calculator.

Crop

Life stage

Presets load N-P-K and the key other nutrients in ppm. The targets below stay editable.

Targets

Target nutrient levels (final solution)

Target N ppm

Target P ppm

Target K ppm

Ammonium share of N (optional) % of total N Ammonium plus urea N, the rest being nitrate. Most hydroponic and soilless crops run 5 to 15%. Above about 20%, root-zone pH drops and calcium uptake falls, especially when low VPD has already slowed transpiration. The calculator reads each product's N form from My Fertilizers and can balance toward this number. Leave blank to skip.

Other nutrient targets (optional)

Leave at 0 to skip. Targets set here get a goal band on the calculator's result scales. Cl and Na are limits, the most you want in the feed. Under the limit counts as fine, and auto-adjust won't add any to reach it.

Saved Recipes

New Recipe

New recipe name

Changes save to Tomato · Fruiting · Week 6 automatically. To keep a copy of it under another name, type the name and hit Save as new.

Load a recipe

bizonag.com/calculatorSample data

Fertigation Calculator

The System, Medium, Water and Tanks tiles at the top each open a window. What you set there saves to the open recipe.

System

Feeding method

You mix a concentrate that an injector meters straight into the irrigation line at a fixed ratio, fed to the plants.

Medium

Coco coir

Fed like inert hydro, with the same crop targets.

Change it on Fertilizer Target Recipes

Water

Source water

Water test

The readings and nutrient fields below hold the selected test's values, and save as you type. Switch tests or hit + New to start another. The open recipe uses the selected one.

Water readings

The descriptive numbers at the top of most reports. Leave 0 for anything not listed.

Measured nutrients (elemental ppm)

From your water report, in elemental ppm (mg/L). Leave 0 for anything not listed.

These values are added as the first ingredient in the mix.

Tanks

Concentrate tanks

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.

bizonag.com/fertilizersSample data

Fertilizer List

Add your own products with their guaranteed analysis. They'll appear in the calculator's ingredient dropdown under "My Fertilizers".

Community Library

Search shared fertilizers Pull in a product someone's already added, no need to retype the analysis. Always confirm the N-P-K and other nutrients match your product's label before using it, since community entries can vary.

Edit Fertilizer

Label PDF (optional)

We read the Guaranteed Analysis and fill in what we can, then you check it. An uploaded file stays on your device.

Product name

N-P-K N‑Phosphate(P₂O₅)‑Potash(K₂O)

N form (from the label, optional)

ammoniacal (NH₄)

urea

nitrate (auto)

Straight from the label: enter the ammoniacal- and urea-N % (e.g. 3 ammoniacal on a 15-N feed). Nitrate fills in as the rest of total N.

Other nutrients - percent by weight (leave 0 if none)

For foliar applications Turn this on to use the product in the Foliar Spray Calculator.

Saved Products

Saved fertilizers

Name	N-P-K	NH₄ %	Urea %	Mg	Ca	S	B	Cu	Fe	Mn	Mo	Zn	Si	Cl	Na

bizonag.com/calculatorSample data

Simple

Batch Settings

Set ratios and concentrate volumes under Tanks.

Ingredients

My Fertilizers

How to use this

Pick a fertilizer for each row.
Set its Base element to the one nutrient you want to dial in to a number, usually N, P, or K. Then enter that Target ppm. The product's other nutrients come with it in their fixed ratio.
Check the Resulting Profile and Mixing Guide below for your totals and exactly how much to add.

Example: choose Calcium Nitrate, set the base element to N at 150 ppm. Its calcium comes along in ratio, so you don't dose it separately.

Example: choose Magnesium Sulfate, set the base element to Mg at 50 ppm. Its sulfur comes along in ratio, so you don't dose it separately.

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. Set ratios and volumes under Tanks.

pH Adjustment

pH adjustment (acid) (optional)

Apply acid to this batch and include its nutrient in the totals

Acid

Concentration % (set to what you bought)

Target alkalinity ppm CaCO₃. Sets the acid amount until you enter a measured pH.

Target feed pH The acid or base brings your measured pH here. Also sets what counts as on target, and the "too acidic" floor.

Measured pH after fertilizer Before acid, and best measured after the fertilizer solution sits overnight. With it, the dose counts your water's alkalinity and your recipe, and brings the feed to your target pH. Without it, the acid amount is an upper bound.

Dosed through your Acid acid line. Change it under Tanks.

Resulting Profile

N · P · K vs Target

Other Nutrients

Nutrient Sources

Each bar is one nutrient's total, split by product. Tap a nutrient to see the ppm each product adds. Before changing a product, check what else it carries.

Concentrate Tanks

Mixing Guide

Share, print or save the full recipe report. Save downloads a PDF.

Targets & saved recipes

Plans

	No account	Free	Home	Pro
The calculator	Yes	Yes	Yes	Yes
Share, print and PDF	Yes	Yes	Yes	Yes
Saved fertilizers	None	2	3	Unlimited
Saved recipes	None	1	3	Unlimited
Reservoir or watering can	Yes	Yes	Yes	Yes
Injector	No	No	1 fertilizer tank and an acid tank	Up to 6 tanks
Batch tank	No	No	No	Yes
pH and acid dosing	No	No	Yes	Yes
Auto-adjust and product suggestions	No	No	No	Yes

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Optimization

Most feed charts give grams per gallon and ignore your water. Your water already has calcium, magnesium, sulfur, sodium and bicarbonate, and each fertilizer comes in a fixed ratio. So the question is which mix of the products you have gets closest to your crop's targets.

For each product, you pick one nutrient to set. The rest of that product's nutrients come with it in its fixed ratio. Whatever your water already has counts toward the targets, so the fertilizers only make up the difference. You get the resulting profile against your targets, the weight to add to your batch, and the order to add things so nothing precipitates.

It works for reservoirs and watering cans, direct-feed injectors with several tanks, and batch tanks, in metric or imperial, with acid dosing based on your water's alkalinity. The screens above are the real pages, filled in with an example.