Fertigation Stock Solution Calculator
Mix water-soluble fertilizer (19-19-19) to the right strength (5 g/L) for any tank or knapsack volume, with the per-15 L dose worked out for you.
Dissolve water-soluble NPK (e.g. 19-19-19) at the dose per litre your fertigation plan calls for, then inject. Keep stock-tank concentration below the salt's solubility limit and never mix calcium and phosphate/sulphate stocks together.
Always follow the product label — the label is the law. Verify doses, PHI and compatibility with the manufacturer and local regulations before spraying.
Spray operators use the free Fertigation Stock Solution Calculator to mix exactly the right amount of water-soluble fertilizer (19-19-19) into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Fertigation Stock Solution Calculator
Drip fertigation delivers fertilizer with the water, but you must dissolve the right amount of water-soluble NPK (like 19-19-19) into the stock tank. This tool multiplies your dose-per-litre by the tank volume to give the grams of fertilizer to add — and reminds you to keep calcium stocks separate from phosphate and sulphate ones.
How to use Fertigation Stock Solution Calculator
- 1Enter the dose per litre (default is the recommended value) and your water volume.
- 2Read the grams of water-soluble fertilizer (19-19-19) to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Fertigation Stock Solution Calculator?
- ✓Converts the recommended 5 g/L dose into grams for your exact volume
- ✓Gives the per-15 L knapsack dose automatically
- ✓Sized for fertigation stock tanks
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How do I mix a water-soluble fertilizer (19-19-19) fertigation solution?+
Add 5 g of water-soluble fertilizer (19-19-19) per litre of water in the stock tank; the calculator multiplies it by your volume. Dissolve water-soluble NPK (e.g.
When should I spray for the best result?+
Dissolve water-soluble NPK (e.g. 19-19-19) at the dose per litre your fertigation plan calls for, then inject. Keep stock-tank concentration below the salt's solubility limit and never mix calcium and phosphate/sulphate stocks together.
Can I increase the concentration to work faster?+
Keep stock-tank concentration below the fertilizer's solubility limit; over-strength solutions crystallise and block drippers.
Is the tool free and private?+
Yes — free, no sign-up, and it runs entirely in your browser, so it works offline in the field.
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