Crystal Ammonium Sulphate (Dissolvable)

$650.00/t - Ex-Store

Crystal Grade Ammonium Sulphate dissolves cleanly making it well suited for liquid applications. Ammonium Sulphate contains nitrogen in readily available ammonium form and sulphur in fast acting sulphate form. Ammonium Sulphate will continue to grow cost effective feed in periods of cool/wet conditions.

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  • N:21%
  • P:0
  • K:0
  • S:24%
  • Ca:0
  • Mg:0

Why Use Crystal Ammonium Sulphate?

Quicker Response times

Ammonium Sulphate contains nitrogen in plant available ammonium form, resulting in a faster and larger nitrogen response compared to Urea in cool/wet conditions.

Reduced Nitrogen Losses

Ammonium nitrogen is stable and less susceptible to volatilisation losses compared to urea nitrogen. Dickie Direct clients are typically applying ammonium nitrogen at 2/3 the rate compared to urea nitrogen and are achieving significantly better responses.

Sulphate Sulphur

Ammonium Sulphate contains readily available sulphate sulphur which is often a limiting factor to nitrogen response during cool/wet periods. This is a result of increased sulphate leaching over this time, combined with cool/wet soil conditions slowing down the rate at which organic sulphur is mineralised into plant available sulphate sulphur.

Reduce Nitrogen Inputs

With less units of nitrogen required to grow more feed Ammonium Sulphate is better for our environment and well suited to regions operating under nitrogen caps.

Product FAQs

When to Use

Autumn, Winter, Spring


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

Nitrogen's Role in Plants

  • Nitrogen is always the nutrient in highest demand by plants, due to the greater content of nitrogen present on a dry weight basis in comparison to any other nutrient.
  • Nitrogen is a primary component of amino acids which are the building blocks of proteins. Thus, by adding nitrogen to soil the protein content in plants is increased.
  • Nitrogen is part of the chlorophyll molecule, and a part of numerous enzymes and coenzymes. Chlorophyll is responsible for photosynthesis, where sunlight is absorbed and stored in the plant as sugars and proteins.
  • Therefore, nitrogen is an integral part of photosynthesis.
  • Signs of nitrogen deficiency – reduced plant growth, yellowing of the leaf, early crop maturing.

Sulphur's Role in Plants

  • Sulphur is essential in forming plant protein as it is present in cysteine and methionine, two vital amino acids involved in protein synthesis.
  • Key component of coenzymes and vitamins, involved in energy transfer and lipid synthesis.
  • Some sulphur compounds are responsible for the taste and smell of plants, like onions.
  • Sulphur amino acids are at high levels in animal fibres, therefore sufficient sulphur is required for good wool production.
  • Promotes nodule formation in legumes
  • Signs of sulphur deficiency – light green to yellowish coloured young leaves, reduced plant growth rates, plants that are short, small and slender.