Pesticides and chemical fertilisers are widely used in modern agriculture to increase crop yields and protect plants from pests and diseases. While these chemicals help farmers produce more food, their excessive and improper use has serious negative impacts on soil quality and human health. One major problem caused by pesticides and fertilisers is soil degradation. Healthy soil contains microorganisms, insects, and nutrients that support plant growth. However, many chemical pesticides kill not only harmful pests but also beneficial organisms such as earthworms and bacteria. These organisms play an important role in maintaining soil fertility and structure. When they are destroyed, the soil gradually loses its natural productivity and becomes less fertile over time.
Chemical fertilisers also affect soil health. Continuous use of synthetic fertilisers can disturb the natural balance of nutrients in the soil. Instead of improving soil quality in the long term, they often lead to nutrient imbalances and increased soil acidity. Over time, this reduces the soil’s ability to retain water and nutrients, making crops more dependent on artificial inputs. In addition to harming the soil, pesticides and fertilisers can also pose serious risks to human health. Residues of pesticides often remain on fruits and vegetables and may enter the human body through food consumption. Long-term exposure to certain pesticides has been linked to health problems such as hormonal disruption, neurological disorders, and even cancer.
Furthermore, these chemicals can contaminate groundwater and nearby rivers through runoff during rainfall. When people consume polluted water, it can lead to health issues such as digestive problems and other chronic illnesses. In conclusion, although pesticides and fertilisers help increase agricultural productivity, their excessive use damages soil health and threatens human well-being. Therefore, farmers and governments should encourage safer agricultural practices such as organic farming, crop rotation, and the use of natural pest control methods to protect both the environment and public health. In my next column we will cover sustainable farming methods that reduce the need for these chemicals.
Published in the Peebleshire News on 20th March 2026