Question

List various reasons that led to the use of biofertilisers and biopesticides though chemical fertilisers or pesticides increased the yield of crops?

Answer 1

Chemical fertilisers and pesticides can increase crop yields, but their continued use can cause environmental and health problems. This has encouraged the use of biofertilisers and biopesticides.

1. Chemical pesticides and fertilisers can wash into rivers and lakes, contaminating water.
2. Pesticide residues can enter food chains and harm humans and other organisms.
3. Broad-spectrum pesticides may kill natural predators and beneficial organisms, upsetting ecological balance.
4. Nitrate runoff can promote eutrophication, while long-term use of artificial fertilisers can alter soil structure and contribute to erosion.
5. Chemical pesticides and herbicides may persist in the environment and encourage resistant pests or weeds.
6. Biofertilisers are generally low-cost and environmentally friendly, and reduce dependence on chemical fertilisers. Biopesticides can control particular pests with less harm to non-target organisms.

Using biological methods helps support crop production while reducing the environmental costs of chemical inputs.