Question

why are fertilizers prove to be harmful for the soil

Answer 1

it is not harmful when u add little to the soil but it is harmful when u use excessive amount of it as it looses the fertility of soil

Answer 2

they prove to be harmful as the content chemicals which are very harmful to our health as well as the soil. moreover they cause Biological magnification, which is a process through which the harmful chemicals keep on circulating in our environment and is very dangerous for our health also.

I hope this helps you my dear friend