Foliar Magnesium Sulphate Calculator
Mix magnesium sulphate (epsom) to the right strength (2% w/v) for any tank or knapsack volume, with the per-15 L dose worked out for you.
A 1–2% Epsom salt spray (10–20 g/L) corrects interveinal yellowing of older leaves (magnesium deficiency) within a week — far faster than soil magnesium on sandy or high-potash soils.
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 Foliar Magnesium Sulphate Calculator to mix exactly the right amount of magnesium sulphate (epsom) into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Foliar Magnesium Sulphate Calculator
Magnesium deficiency yellows the older leaves between the veins, and on sandy or potash-heavy soils a 1–2% Epsom salt foliar spray (10–20 g per litre) greens them up within a week — much faster than soil magnesium. This tool turns the chosen spray strength into grams of Epsom salt for your exact volume.
How to use Foliar Magnesium Sulphate Calculator
- 1Enter the concentration (default is the recommended value) and your water volume.
- 2Read the grams of magnesium sulphate (epsom) to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Foliar Magnesium Sulphate Calculator?
- ✓Converts the recommended 2% concentration into grams for your exact volume
- ✓Gives the per-15 L knapsack dose automatically
- ✓Estimates the area one tank covers
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How do I mix a 2% magnesium sulphate (epsom) spray?+
A 2% w/v spray means 20.0 g per litre of water, so a 15 L knapsack needs 300 g. The calculator scales this to whatever tank size you enter.
When should I spray for the best result?+
A 1–2% Epsom salt spray (10–20 g/L) corrects interveinal yellowing of older leaves (magnesium deficiency) within a week — far faster than soil magnesium on sandy or high-potash soils.
Can I increase the concentration to work faster?+
No — going above the recommended 2% risks scorching the leaves and wasting product. Repeat sprays at the correct strength instead of one strong one.
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.
Related Agri tools
Tractor Fuel Consumption Calculator
Estimate your tractor's diesel consumption per hour from its horsepower, load and specific fuel consumption.
● LiveTractor Fuel Cost Per Acre Calculator
Convert your tractor's fuel use per hour into diesel litres and cost per acre for any field operation.
● LiveImplement Field Capacity Calculator
Calculate the effective field capacity (ha/h and acres/h) of any implement from width, speed and field efficiency.
● Live