Environmental hazards related to fertilizers' use:

1. The massive quantities of inorganic fertilizers affect the soil nutrient-holding capacity
2. Eutrophication:

High solubilities of fertilizers also degrade ecosystems through eutrophication (which means an increase in chemical nutrients - typically compounds containing nitrogen or phosphorus - in an ecosystem).

1. Storage and application of some nitrogen fertilizers may cause emissions of the greenhouse gas nitrous oxide (N₂O). Ammonia gas (NH₃) may be emitted from the applied inorganic fertilizers. This extra ammonia can also increase soil acidity
2. Excessive nitrogen fertilizers can lead to pest problems by increasing their reproduction rate.

Note:

For these reasons, it is recommended that the nutrient content of the soil and nutrient requirements of the crop are carefully balanced with the application of inorganic fertilizer.