Which of the following statements is incorrect ?

Options

A. Fertilisers contain much higher amount of nutrients in comparison to the manures.
B. Manures add a great amount of organic mater in the form of humus in the soil.
C. Both fertilisers and manures are nutrient specific.
D. Fertilisers give short-term benfits whereas manures give long-term benefits.

Explanation

To determine which statement is incorrect regarding fertilizers and manures, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Fertilizers and Manures**:
- Fertilizers are synthetic substances that provide nutrients to plants.
- Manures are natural substances, typically organic, that improve soil quality.

2. **Analyzing Statement A**:
- **Statement A**: "Fertilizers contain much higher amount of nutrients in comparison to the manures."
- This statement is **correct** because fertilizers are designed to have a concentrated amount of nutrients.

3. **Analyzing Statement B**:
- **Statement B**: "Manures add a great amount of organic matter in the form of humus in the soil."
- This statement is **correct** as manures are rich in organic matter, which contributes to the formation of humus.

4. **Analyzing Statement C**:
- **Statement C**: "Both manures and fertilizers are nutrient-specific."
- This statement is **incorrect**. Fertilizers can be nutrient-specific (targeting specific nutrients), while manures are not nutrient-specific as their nutrient content varies based on the source of the organic matter (e.g., cow dung, vegetable waste).

5. **Analyzing Statement D**:
- **Statement D**: "Fertilizers give short-term benefits whereas manures give long-term benefits."
- This statement is **correct** because fertilizers provide immediate nutrients, while manures improve soil health over time.

6. **Conclusion**:
- The incorrect statement among the options provided is **Statement C**.

### Final Answer:
The incorrect statement is: **"Both manures and fertilizers are nutrient-specific."**