production and uses of NPK fertilisers

• What compounds are used to improve agricultural productivity

  Nitrogen, phosphorus and potassium
• NPK fertilisers contain

  nitrogen phosphorous and potassiun
• Industrial production of NPK fertilisers can be achieved using a variety of raw materials in several integrated processes
• NPK fertilisers are...

  formulations of various salts containing appropriate percentages of the elements
• Ammonia can be used to


  manufacture ammonium salts and nitric acid
• Potassium chloride, potassium sulfate and phosphate rock are obtained by mining
• phosphate rock can not be directly used as a fertiliser
• Phosphate rock is treated with

  nitric acid or sulfuric acid
• phosphate rock is treated with nitric acid or sulfuric acid to produce 


  soluble salts that can be used as fertilisers
• phosphate rock reacts with nitric acid to produce

  calcium nitrate and phosphoric acid (which is neutralised with ammonia to make ammonium phosphate)
• phosphate rock reacts with sulfuric acid to produce

  single superphosphate (a mixture of calcium sulfate and calcium phosphate)
• Phosphate rock reacts with phosphoric acid to produce

  triple superphosphate (calcium phosphate)