Which of the following statements is not true for chemical fertilisers?

Options

A. They are nutrient specific.
B. They are readily soluble in water.
C. They provide organic matter (humus) to the soil.
D. Overuse of chemical fertilisers pollutes the soil.

Explanation

To determine which statement is not true for chemical fertilizers, we need to analyze the provided statements one by one.

### Step-by-Step Solution:

1. **Understanding Chemical Fertilizers**:
- Chemical fertilizers are substances that provide essential nutrients to plants, primarily nitrogen, phosphorus, and potassium. They are used to enhance crop yield and maintain soil health.

2. **Analyzing the Statements**:
- **Statement 1**: "They are nutrient-specific."
- This statement is true. Chemical fertilizers are formulated to provide specific nutrients that plants need.

- **Statement 2**: "They provide organic matter humus to the soil."
- This statement is not true. Chemical fertilizers are inorganic and do not contribute organic matter or humus to the soil. Humus is typically derived from decomposed organic materials.

- **Statement 3**: "They are readily soluble in water."
- This statement is true. Chemical fertilizers dissolve easily in water, making nutrients readily available to plants.

- **Statement 4**: "Overuse of chemical fertilizers pollutes the soil."
- This statement is also true. Excessive use of chemical fertilizers can lead to soil degradation and pollution.

3. **Conclusion**:
- The statement that is not true for chemical fertilizers is **Statement 2**: "They provide organic matter humus to the soil."

### Final Answer:
The statement that is not true for chemical fertilizers is: **"They provide organic matter humus to the soil."**

---