Mineral
Ammonium Sulphate امونیم سلفیٹ
Nitrogen plus sulphur, with an acidifying effect on soil.
N 21%P₂O₅ 0%K₂O 0%
What it is
Ammonium sulphate carries 21% nitrogen and ~24% sulphur. It suits sulphur-deficient soils and alkaline conditions, where its acidifying effect is an advantage rather than a drawback.
Benefits
- Supplies sulphur with every nitrogen application
- Useful on alkaline soils
- Less volatilization loss than urea on the surface
Precautions
- Acidifies soil with repeated use — monitor pH on long-term use
- Lower N concentration means more bulk than urea
Application guidance
Broadcast as a nitrogen top-dressing, particularly where sulphur is also deficient. Rate = (N needed × 100) ÷ 21.
Common questions about Ammonium Sulphate
What is the ammonium sulphate dose per acre?
The exact dose depends on your crop's nitrogen requirement — enter your crop in the dose calculator for a precise figure. Ammonium sulphate (21-0-0 plus 24% sulphur) is applied as a top-dress when the crop needs nitrogen and sulphur together, and it suits neutral to alkaline soils because of its mild acidifying effect.
Ammonium sulphate vs urea — which should I use?
Use ammonium sulphate where soils are sulphur-deficient (common in cereals and oilseeds) or on alkaline soils; use urea where only cheap nitrogen is needed. Both supply nitrogen, but only ammonium sulphate also supplies sulphur.