_____is useful in fields that have uneven land, or where the soil is sandy.

Options

A. Sprinkler system
B. Drip irrigation
C. Pulley system
D. Lever system

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a method that is useful in fields with uneven land or sandy soil.

2. **Identifying Irrigation Methods**: The two main irrigation methods mentioned in the video are the sprinkler system and drip irrigation.

3. **Analyzing the Sprinkler System**: The sprinkler system is designed to distribute water evenly across crops, similar to rainfall. It is particularly effective in uneven terrains, such as mountainous areas, because it can reach various parts of the field without the need for a flat surface.

4. **Analyzing Drip Irrigation**: Drip irrigation delivers water directly to the roots of plants, which is efficient for water usage. However, it typically requires a more even land surface for effective installation.

5. **Conclusion**: Since the question specifies the need for a method suitable for uneven land or sandy soil, the sprinkler system is the most appropriate choice.

6. **Final Answer**: The answer is **"Sprinkler system."**

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