Which one is not chemical fertilizer?

Options

A. a) Urea
B. b) Potash
C. c) Phosphate
D. d)Compost

Explanation

**Step-by-Step Solution:**

1. **Understand the Definition of Chemical Fertilizers:**
- Chemical fertilizers are substances that contain chemical elements which enhance plant growth. They can be either natural or artificial.

2. **Analyze the Options Given:**
- The options provided are:
- A. Urea
- B. Potash
- C. Phosphate
- D. Compost

3. **Evaluate Each Option:**
- **Option A: Urea**
- Urea is a nitrogenous compound that contains 46% nitrogen. It is widely used as a chemical fertilizer.
- **Option B: Potash**
- Potash refers to potassium-containing salts, which are also used as chemical fertilizers.
- **Option C: Phosphate**
- Phosphate fertilizers are derived from phosphate rocks and are used to supply phosphorus to plants. They are classified as chemical fertilizers.
- **Option D: Compost**
- Compost is made from decomposed organic matter and is considered a natural fertilizer, not a chemical fertilizer.

4. **Identify the Correct Answer:**
- After evaluating all options, it is clear that:
- Urea, Potash, and Phosphate are all chemical fertilizers.
- Compost is not a chemical fertilizer; it is a natural fertilizer.

5. **Conclusion:**
- Therefore, the answer to the question "Which one is not a chemical fertilizer?" is **D. Compost**.

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