Elemental sulphur Calculator
Scale elemental sulphur (bentonite) (90% S) to your field, see the S delivered, bag count and cost from the recommended 22 kg/ha rate.
Bentonite sulphur (90% S) is far more concentrated than gypsum but must be oxidised by soil bacteria before plants use it — apply 3–4 weeks ahead. It also gently acidifies, useful on alkaline soils.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Farmers and soil-test labs use the free Elemental sulphur Calculator to turn a per-hectare elemental sulphur (bentonite) recommendation into the exact quantity, bag count and cost for their own field in seconds.
About Elemental sulphur Calculator
Bentonite (degradable elemental) sulphur is 90% S — five times richer than gypsum — but soil microbes must oxidise it to sulphate before crops can use it, so apply a few weeks before sowing. It also mildly acidifies alkaline soil. This tool scales the dose and reports the sulphur delivered.
How to use Elemental sulphur Calculator
- 1Enter your field area and unit.
- 2Pick the soil rating or situation that matches your soil test.
- 3Read the elemental sulphur (bentonite) quantity, S delivered, bags and cost, then follow the application note.
Why use Elemental sulphur Calculator?
- ✓Scales the recommended elemental sulphur (bentonite) rate to hectares, acres or bigha
- ✓Shows the actual S nutrient delivered, not just product weight
- ✓Estimates cost and bag count so you can budget the purchase
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How much elemental sulphur (bentonite) per acre?+
Oilseed sulphur dose: 22 kg/ha (8.9 kg/acre); Alkaline-soil acidifier: 50 kg/ha (20.2 kg/acre); Maintenance: 11 kg/ha (4.5 kg/acre). Bentonite sulphur (90% S) is far more concentrated than gypsum but must be oxidised by soil bacteria before plants use it — apply 3–4 weeks ahead.
How much S does elemental sulphur (bentonite) contain?+
Elemental sulphur (bentonite) carries about 90% S, so each 100 kg supplies 90.0 kg of S. The calculator multiplies your applied quantity by this to show the true nutrient delivered.
When and how should I apply it?+
Bentonite sulphur (90% S) is far more concentrated than gypsum but must be oxidised by soil bacteria before plants use it — apply 3–4 weeks ahead. It also gently acidifies, useful on alkaline soils.
Is the tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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