# NPK fertilisers contain compounds of nitrogen, phosphorus and potassium. Explain why farmers use NPK fertilisers and describe how the nitrogen-containing compound in an NPK fertiliser is produced industrially.

> AQA GCSE Chemistry (8462) — 4.10.4 The Haber process and the use of NPK fertilisers (Chem only) · Explain · 4 marks

## Mark scheme (4 marks)

1. NPK fertilisers improve agricultural productivity / increase crop yield
2. Ammonia is the nitrogen-containing compound / ammonia is made by the Haber process
3. Nitrogen (gas) and hydrogen (gas) are the raw material reactants in the Haber process
4. The reaction is reversible / unreacted gases are recycled / the ammonia is separated and removed

## Key terms

- [NPK fertilisers](https://www.gradenine.co.uk/glossary/npk-fertilisers)

## Related

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Source: [GradeNine](https://www.gradenine.co.uk/q/npk-fertilisers-contain-compounds-of-nitrogen-f00a49c7) · Published by Druglandscape Ltd.