Question

why does excessive use of fertilizer harmful for us​

Answer 1

Explanation:

Overuse of fertilizer can also cause plants to develop shallow root systems, which reduces their stability and ability to obtain water during dry conditions. Too much fertilizer can decrease the soil fertility, seriously affect the quality of crops, and the health of the human body as a result of chemical residues.

Answer 2

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Excessive fertilizer that washes into storm drains eventually makes its way into bodies of water, such as rivers and lakes, causing pollution. Although the environmental impact is considerably larger from the overuse of fertilizers on farms -- simply due to the amount they use -- it's also a problem from fertilizer use in home gardens.