What is added to soil to improve its fertility?

Fertiliser is a substance that is specifically added to soil to enhance its fertility by supplying essential nutrients that plants need to grow effectively. These nutrients typically include nitrogen, phosphorus, and potassium, which are critical for various plant functions, such as photosynthesis, root development, and flower and fruit production. Fertilisers can be either chemical or organic and are designed to be highly concentrated, making them effective in promoting vigorous plant growth and improving yields in agricultural practices.

While compost and manure also improve soil fertility, they do so in more gradual ways, offering benefits over time as they break down and release nutrients. Pesticides, on the other hand, are meant to control pests and diseases and do not contribute to the nutrient content of the soil. Thus, fertiliser stands out as the most direct and effective option for rapidly enhancing soil fertility.