Why NPK is essential for plants?

Explanation

### Step-by-Step Solution:

1. **Understanding NPK**: NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). These are three essential nutrients required for the healthy growth of plants.

2. **Role of Nitrogen (N)**:
- Nitrogen is crucial for the growth of leaves.
- It is a key component of chlorophyll, which plants use for photosynthesis.
- Adequate nitrogen promotes overall plant growth and increases biomass.
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