Which of the following fertilizers replenishes only one essential among nitrogen, phosphorus

Options

A. Potassium nitrate
B. Triammonium phosphate
C. Potassium bisulphate
D. All the above.

Explanation

To determine which fertilizer replenishes only one essential nutrient among nitrogen and phosphorus, we need to analyze the common fertilizers and their nutrient compositions.

### Step-by-Step Solution:

1. **Identify the Nutrients**: The two essential nutrients we are focusing on are nitrogen (N) and phosphorus (P).

2. **List Common Fertilizers**: Some common fertilizers include:
- Urea (contains nitrogen)
- Superphosphate (contains phosphorus)
- Potassium Nitrate (contains nitrogen and potassium)
- Ammonium Phosphate (contains nitrogen and phosphorus)

3. **Examine Each Fertilizer**:
- **Urea**: Primarily provides nitrogen.
- **Superphosphate**: Primarily provides phosphorus.
- **Potassium Nitrate**: Provides nitrogen and potassium, but not phosphorus.
- **Ammonium Phosphate**: Provides both nitrogen and phosphorus.

4. **Determine the Answer**: The fertilizer that replenishes only one essential nutrient among nitrogen and phosphorus is **Superphosphate**, as it only provides phosphorus.

5. **Conclusion**: Therefore, the answer to the question is **Superphosphate**.