Kieserite (Magnesium Sulphate)


  • N:0
  • P:0
  • K:0
  • S:18%
  • Ca:0
  • Mg:16%
Hastings Store – Product in stock as well as shipping to order.
All Other Stores – Currently shipping to order.


18% S, 16% Mg
Supplied ex Hastings Warehouse or through direct shipment to any NZ port
Supplied in bulk or 1200 KG bags (included in price)
Use in: Year round
Click here for freight rates to your farm

Products FAQs

Kieserite contains readily available Sulphate and Magnesium

Why Use Kieserite:

Precautions when applying Kieserite:

  • There are no specific precautions required when applying Kieserite.

Magnesiums role in crops and pastures:

  • Crops and pastures require magnesium to capture the sun’s energy for growth and production through photosynthesis.
  • Magnesium acts as a phosphorus carrier in plants, and is required for better root formation and thus for better nutrient and water efficiency in plants.
  • Magnesium aids in plant respiration and the activation of many enzyme systems.

When to use

Summer, Autumn, Winter, Spring

Sulphurs role in crops and pastures:

  • A structural component of protein and peptides.
  • Active in the conversion of inorganic N into protein.
  • A catalyst in chlorophyll production.
  • Promotes nodule formation in legumes.
  • A structural component of various enzymes.


Use Kieserite as a form of Magnesium when crops and pastures have an immediate requirement for Magnesium. Kieserite also contains readily available Sulphate Sulphur which is also often a limiting nutrient in crops and pasture.