Question

Explain how an excessive use of nitrate fertilizers in agricultural fields may affect human life

Answer 1

because some of the nitrate fertilizers used is brought away by rainwater etc.
these erosed fertilizer mix in the lake or ground water or even in ocean by water.
when sun shines these contaminated water evaporates and ground water is used by humans these vapours condense and fall on surface with these chemical artificial fertilizers .these rain is called acid rain these fertilizers can cause skin diseases when exposed to human body. hence it is harmful