Which substance is added to soil to enhance plant growth?

Fertiliser is added to soil to enhance plant growth because it contains essential nutrients that plants require for optimal development. These nutrients typically include macronutrients such as nitrogen, phosphorus, and potassium, which support various physiological processes including root development, blooming, and fruit production. By supplying these vital substances, fertilisers help improve plant health, increase crop yields, and promote overall growth.

In contrast, pesticides are used to control pests and diseases that can negatively impact plant health, but they do not directly provide nutrients. Herbicides are designed to kill unwanted plants or weeds, which can free up nutrients and resources for desirable plants but do not enhance growth themselves. Insecticides target insect pests that can harm plants but similarly do not supply the nutrients necessary for growth. Thus, the role of fertiliser is distinct and pivotal in the context of enhancing plant growth.