Name one nitrogen fertilizer.

1. Fertilizers are natural and synthetic materials that can be used for increasing the fertility of the soil by boosting the nutrients needed for plants.
2. Nitrogen fertilizers are compounds containing Nitrogen.
3. They are manufactured with the help of Ammonia($\mathit{N}{\mathit{H}}_{\mathbf{3}}$)
4. Urea, diamine hydrogen phosphate, ammonium sulfate, etc. are Nitrogen fertilizers.