Question

What would happen if a farmer used too much fertilizer? What adverse effect can this have on the environment?

Answer 1

This is will affect the soil and soil will lose the fertility..
Its affect microbes and microbes would die if more pesticides were used..

Answer 2

The problem mostly caused by excessive use of fertilizer is leeching. Here the chemical pesticides/ingredient gets mixed in underground water and that makes the water based contaminated and adverse for human health.

Nitrogen fertilizers breakdown into nitrates and move easily through the soil.

As it is water-soluble and can endure in groundwater for eras, the addition of more nitrogen over the years has an avaricious effect.