What are fertilizers? How are they classified ? Explain the classification of fertilizers with an example.

Explanation

### Step-by-Step Text Solution:

**Step 1: Definition of Fertilizers**
Fertilizers are substances that are added to soil or plants to provide essential nutrients that promote plant growth. They can be either natural or artificial and consist of various compounds or mixtures of compounds.

**Step 2: Classification of Fertilizers**
Fertilizers can be classified into two main categories based on their source:
1. **Natural Fertilizers**
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