Not used as fertilizer: Ammonium sulphide

Ammonium sulphide is not commonly used as a fertilizer due to its strong odor and toxicity. It is primarily used in the laboratory for various chemical reactions and processes.

Explanation:

1. Ammonium nitrate:
Ammonium nitrate (NH4NO3) is one of the most widely used fertilizers in agriculture. It provides a readily available source of nitrogen, an essential nutrient for plant growth. Ammonium nitrate is a white crystalline solid that is soluble in water. It is highly effective in promoting vegetative growth and is commonly used in the production of crops such as corn, wheat, and vegetables.

2. Ammonium sulphide:
Ammonium sulphide (NH4)2S is not commonly used as a fertilizer due to its foul odor and toxic nature. It is primarily used in laboratory settings for various chemical reactions and processes. Ammonium sulphide is a colorless to yellowish liquid that is highly soluble in water. It is mainly used as a reducing agent or in the synthesis of other chemicals.

3. Ammonium phosphate:
Ammonium phosphate is a general term that refers to several different types of fertilizers containing both ammonium and phosphate ions. These fertilizers are commonly used to provide a source of both nitrogen and phosphorus, important nutrients for plant growth. Examples of ammonium phosphate fertilizers include monoammonium phosphate (MAP) and diammonium phosphate (DAP). These fertilizers are highly soluble in water and are commonly used in the production of crops such as corn, soybeans, and potatoes.

4. Ammonium sulphate:
Ammonium sulphate ((NH4)2SO4) is another widely used fertilizer. It is a white crystalline solid that is soluble in water. Ammonium sulphate provides a source of both nitrogen and sulfur, essential nutrients for plant growth. It is commonly used in the production of crops such as wheat, barley, and turfgrass.

In conclusion, while ammonium sulphide is not commonly used as a fertilizer due to its strong odor and toxicity, the other options, namely ammonium nitrate, ammonium phosphate, and ammonium sulphate, are commonly used fertilizers in agriculture.