Step 1: Role of nitrogenous fertilizers.
They supply nitrogen, an essential nutrient for plant growth and protein synthesis.
Step 2: Examples.
- Urea (46% N): Most widely used nitrogenous fertilizer.
- Ammonium sulphate (20–21% N): Provides nitrogen and sulphur.
Step 3: Conclusion.
Thus, examples are Urea and Ammonium sulphate.