Ammonium Sulphate

Ammonium sulphate NH4 2SO4, is an inorganic salt with a number of commercial uses. White or off-white crystal, easily soluble in water. The aqueous solution appears acid. Insoluble in alcohol, and ammonia, Easily deliquescent in the air.
Description Review

 White Crystal Nitrogen Fertilizer Ammonium Sulphate Crop Nutrient



Molar Mass of NH4 2SO4: 132.14 g/mol

Solubility in water:

70.6 g per 100 g water (0 °C)

74.4 g per 100 g water (20 °C)

103.8 g per 100 g water (100 °C)

AMS fertilizer analysis:

Ammonium sulfate, NH4 2SO4 is an inorganic salt with a number of commercial uses. It contains 21% nitrogen and 24% sulfur. White or off-white crystal, easily soluble in water. The aqueous solution appears acid. Insoluble in alcohol, and ammonia, Easily deliquescent in the air.









Nitrogen content


Moisture content


Free Acid




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    The most common use of NH4 2SO4 is as a soil fertilizer. Growers apply ammonium sulfate primarily where they need supplemental N and S to meet the nutritional requirement of growing plants.

    NH4 2SO4 is also known as 21 0 0 fertilizer in agriculture because of nitrogen accounting for 21%, it contributes nitrogen, which aids in plant growth.  Compared to ammonium nitrate, ammonium sulfate as an important fertilizer is a better choice since nitrate-based fertilizers are a poor choice due to denitrification losses. The nitrogen element of NH4 2SO4 is mainly derived from ammonium, when introduced into damp soil, an ammonium ion is released. Microbes convert ammonium to nitrate[2 NH₄⁺ + 3O₂ → 2NO₃⁻ + 2H₂O + 4H⁺], This creates a small amount of acid, which lowers the pH balance of the soil. Therefore, NH4 2SO4 is an important fertilizer for alkaline soils.


    Hazards of Use:

    As an excellent nitrogen fertilizer, due to its acidic nature, NH4 2SO4 will harden the soil after using it for a long time, which is a defect that cannot be ignored.

    In addition, the many hazards of NH4 2SO4 to the human body also need to be paid attention to. This is mainly reflected in its irritation, which will cause irritating damage to our eyes, various mucosal tissues and skin, etc. When in close contact with it, if it is accidentally inhaled, ingested, or contaminated on the skin, it will be absorbed by it, etc.  the damage will follow.

    Safety precautions:

    While NH4 2SO4 is used as an important fertilizer and therefore is readily available, it should be used safely.



    How to identify ammonium sulfate?

    To identify NH4 2SO4, you can start from four aspects: color, smell, burning of iron flakes, and dissolution, as follows:

    1. Look at the color. Good ammonium sulfate is white, first-class and qualified.

    2. Smelling. Some have a gas smell, some have no smell at all.

    3. Observe the burning phenomenon of the iron sheet. After burning the iron sheet red, put a small amount of ammonium sulfate on the sheet, and it can be found that the fertilizer gradually melts, the fertilizer particles bounce on the iron plate, and emit white smoke and pungent ammonia smell. After melting, there are residues on the iron plate. , but no combustion will occur.

    4. Observe the dissolution phenomenon. Using a glass or white porcelain bowl, add water to ammonium sulfate, then add a small amount with a rice spoon, stir or shake it with clean chopsticks, and it can be found that it is completely dissolved in water.

    How to use ammonium sulfate for better fertilizer efficiency?

    1. When topdressing NH4 2SO4 in paddy fields, keep the field moist or have a water layer of about 1.5 cm to facilitate the absorption of rice roots. Do not release water for 4 to 5 days after fertilization to avoid loss of fertilizer. Since NH4 2SO4 contains 24% sulfur, under reducing conditions, it will be reduced to H2S, which will poison rice roots. Therefore, in paddy fields with poor drainage, it should be used as little as possible;

    2. NH4 2SO4 is used in dry land, especially in calcareous soil, and should be deeply covered with soil to prevent nitrogen loss;

    3. When NH4 2SO4 is used as seed fertilizer, do not contact with seeds. If ammonium sulfate is used to mix wheat seeds, the amount per 667 square meters of land should be controlled at 2.5 to 5 kg, and it should be mixed and used immediately to avoid affecting the germination of seeds. NH4 2SO4 should be used after the leaves are dewy or rainy to prevent the fertilizer from sticking to the leaves and causing damage to the seedlings.


    Precautions for storage and transportation of ammonium sulfate

    The storage and transportation of NH4 2SO4 must be handled carefully, because a little carelessness during the storage process will cause the reaction to deteriorate, and if not carefully transported, NH4 2SO4 will also cause waste and loss. Transportation and storage are related to its longevity.

    For details, please click Precautions for NH4 2SO4


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