Ammonium Sulphate


  • N:20.5%
  • P:0
  • K:0
  • S:24%
  • Ca:0
  • Mg:0

Boost your production this Winter and Spring with Ammonium Sulphate. With Nitrogen in readily available Ammonium form and Sulphur in fast acting Sulphate form Ammonium Sulphate will improve responses with less units of N required over the wetter/cooler months. Recommended application rates range from 60-150 KG/H. Call your Dickie Direct Area Manager today for more information.

20.5% N, 24% S
Supplied ex Hastings Warehouse or through direct shipment to any NZ port
Supplied in bulk or 1250KG bags (included in price)
Use in: Autumn, Winter, Spring
Click here for freight rates to your farm

Products FAQs

Why Use Ammonium Sulphate:

  • Ammonium Sulphate is often used in place of Urea when soil sulphate levels are low.
  • Ammonium Sulphate is typically used in Autumn, Winter and Spring when higher rainfall has leached Sulphate levels.
  • Ammonium Sulphate also offers increased responses in cooler temperatures when soil enzymes are less active and the Ammonium Nitrogen is able to be broken down and uptaken more efficiently than Urea Nitrogen.

Precautions when applying Ammonium Sulphate:

  • Avoid application before large amounts of rainfall (40ml plus within 10 hours) to reduce any leaching.

Nitrogen's role in crops and pastures:

  • Nitrogen increases the protein content in plants through the vitamins, amino acids and energy systems in which it aids.
  • Nitrogen is necessary for chlorophyl synthesis, the process in which chlorophyll is increased in the plant giving plants a dark green appearance.
  • It is through chlorophyll that sunlight is absorbed as energy into the plant making chlorophyll an important part of photosynthesis where sunlight is absorbed and stored in the plant as sugars and proteins.
  • Hence, Nitrogen is an important part of photosynthesis.

When to use

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.



Ammonium Sulphate contains Nitrogen in Ammonium form and Sulphur in Sulphate form. Ammonium Nitrogen is more available than Urea Nitrogen and in most instances will offer increased Nitrogen utilisation. Sulphate Sulphur is readily available for plants to uptake.

Product Downloads

Ammonium Sulphate flyer 2020