Which of the following soil requires less irrigation?

Options

A. Sandy soil
B. Alluvial soil
C. Loamy soil
D. Clayey soil

Explanation

To determine which type of soil requires less irrigation, we need to analyze the water retention properties of different soil types. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understand Soil Types**: There are various types of soil, including sandy, alluvial, loamy, and clayey soils. Each type has different properties regarding water retention.

2. **Analyze Sandy Soil**: Sandy soil has large particles and a high sand content. This type of soil does not retain water well, meaning it drains quickly and requires more frequent irrigation.

3. **Examine Alluvial Soil**: Alluvial soil, which is often found in river valleys, can vary in texture but generally has a good balance of sand, silt, and clay. While it can hold some water, it still requires regular irrigation.

4. **Look at Loamy Soil**: Loamy soil is a mixture of sand, silt, and clay. It has good water retention capabilities but still needs irrigation, especially in dry conditions.

5. **Consider Clayey Soil**: Clayey soil is composed of very fine particles and has a high clay content. This type of soil has excellent water retention properties, meaning it can hold a significant amount of water and does not require as much irrigation compared to the others.

6. **Conclusion**: Since clayey soil retains water well and has a high water-holding capacity, it requires less irrigation than sandy, alluvial, or loamy soils. Therefore, the correct answer is clayey soil.

### Final Answer:
**Clayey soil requires less irrigation.**