Why are nitrogen, phosphorus, and potassium compounds important for agricultural productivity?

These compounds are essential nutrients that help plants grow stronger, produce more fruit, and resist diseases, leading to higher crop yields.

A strong answer should directly address the approved learning objective to explain that nitrogen, phosphorus and potassium compounds are used in fertilisers to improve agricultural productivity. (Chemistry only). This question belongs to Production and uses of NPK fertilisers within The Haber process and the use of NPK fertilisers, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to chemistry only, and keeps the wording specific to AQA GCSE revision.