Which one of these substances can farmers make in their fields, on their own, and use in their fields to improve crop yield?

Options

A. Manure
B. Fungicide
C. Fertilizer
D. Weedicide

Answer

To determine which substance farmers can make in their fields to improve crop yield, let's analyze the options provided: manure, fungicide, fertilizers, and weedicide.

### Step-by-Step Solution:

1. **Understanding Manure**:
- Manure is a natural fertilizer made from decomposed organic matter, such as dead plants and animal waste.
- Farmers can create manure by composting animal dung, urine, and plant residues in their fields.

2. **Analyzing Fertilizers**:
- Fertilizers are typically manufactured in factories and are synthetic.
- They are not made on the farm, so this option does not qualify.

3. **Examining Fungicides**:
- Fungicides are chemical substances used to kill fungi that can harm crops.
- These are usually produced in industrial settings and are not made by farmers in their fields.

4. **Looking at Weedicides**:
- Weedicides are chemicals used to eliminate unwanted plants (weeds) that compete with crops for nutrients and space.
- Like fungicides, these are also manufactured and not made on the farm.

5. **Conclusion**:
- Among the four options, only manure can be produced by farmers in their fields.
- It improves soil fertility and thus enhances crop yield, making it the correct answer.

### Final Answer:
Farmers can make **manure** in their fields to improve crop yield.