Gypsum Calculator
Scale gypsum (sodic reclamation) (23% Ca) to your field, see the Ca delivered, bag count and cost from the recommended 2500 kg/ha rate.
Gypsum reclaims sodic (alkali) soil by replacing exchangeable sodium with calcium, then the sodium is leached out with good-quality irrigation water. Apply, incorporate to 10–15 cm, then leach; reassess after one season.
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 Gypsum Calculator to turn a per-hectare gypsum (sodic reclamation) recommendation into the exact quantity, bag count and cost for their own field in seconds.
About Gypsum Calculator
Sodic (alkali) soils are dispersed and impermeable because exchangeable sodium dominates the clay. Gypsum supplies calcium that swaps out the sodium, which is then leached away. Reclamation rates run into tonnes per hectare — this tool scales the gypsum requirement by sodicity (ESP class) for your field area.
How to use Gypsum Calculator
- 1Enter your field area and unit.
- 2Pick the soil rating or situation that matches your soil test.
- 3Read the gypsum (sodic reclamation) quantity, Ca delivered, bags and cost, then follow the application note.
Why use Gypsum Calculator?
- ✓Scales the recommended gypsum (sodic reclamation) rate to hectares, acres or bigha
- ✓Shows the actual Ca 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 gypsum (sodic reclamation) per acre?+
Slightly sodic (ESP 15–25): 2500 kg/ha (1011.7 kg/acre); Moderately sodic (ESP 25–40): 5000 kg/ha (2023.4 kg/acre); Strongly sodic (ESP >40): 10000 kg/ha (4046.9 kg/acre). Gypsum reclaims sodic (alkali) soil by replacing exchangeable sodium with calcium, then the sodium is leached out with good-quality irrigation water.
How much Ca does gypsum (sodic reclamation) contain?+
Gypsum (sodic reclamation) carries about 23% Ca, so each 100 kg supplies 23.0 kg of Ca. The calculator multiplies your applied quantity by this to show the true nutrient delivered.
When and how should I apply it?+
Gypsum reclaims sodic (alkali) soil by replacing exchangeable sodium with calcium, then the sodium is leached out with good-quality irrigation water. Apply, incorporate to 10–15 cm, then leach; reassess after one season.
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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