Importance of Nitrogen in Soil
Nitrogen is an essential nutrient for plant growth and development. It is a major component of amino acids, which are the building blocks of proteins. Proteins are crucial for plant growth as they are involved in various physiological processes such as photosynthesis, respiration, and enzyme activity.

Role of Nitrogen-Rich Fertilizers

1. Enhancing Plant Growth
Nitrogen-rich fertilizers provide plants with a readily available source of nitrogen, which helps them to grow faster and produce higher yields. This is especially important for crops that have high nitrogen requirements, such as corn and wheat.

2. Improving Soil Fertility
Adding nitrogen-rich fertilizers to the soil can also help improve its fertility. Nitrogen is a major component of organic matter in the soil, which is essential for maintaining soil structure, water retention, and nutrient cycling.

3. Promoting Protein Synthesis
While the soil itself does not contain protein, nitrogen in the form of nitrates and ammonium is taken up by plants and used in protein synthesis. This is why nitrogen is often referred to as the "building block" of proteins in plants.

4. Correcting Nitrogen Deficiencies
In soils where nitrogen levels are low, adding nitrogen-rich fertilizers can help correct deficiencies and ensure that plants have an adequate supply of this essential nutrient.

Conclusion
In conclusion, farmers add nitrogen-rich fertilizers to the soil to provide plants with a readily available source of nitrogen, which is essential for plant growth and development. While the soil itself does not contain protein, nitrogen plays a crucial role in protein synthesis in plants, making it a vital nutrient for agricultural productivity.