Correct Option: B. Cassava Detailed Explanation: What is Capping? Capping is a cultural practice primarily associated with the cultivation of cassava (Manihot esculenta). It involves the practice of covering the soil around the cassava plants with organic materials or mulch. This is done to improve soil moisture retention, suppress weed growth, and enhance soil fertility as the organic material decomposes. Why is Cassava the Correct Answer? 1. Soil Moisture Retention: Cassava is a drought-tolerant crop, but it benefits significantly from adequate moisture during its growth stages. Capping helps retain moisture in the soil, which is crucial for the development of the tubers.

1. Weed Suppression: Weeds compete with cassava for nutrients and water. By applying a layer of organic material, capping reduces the amount of sunlight that reaches the soil, thereby inhibiting weed growth.
2. Soil Fertility: The organic materials used in capping, such as straw or leaves, decompose over time, adding nutrients back into the soil. This is particularly beneficial for cassava, which requires nutrient-rich soil for optimal growth.
3. Root Development: Capping can also promote better root development in cassava. The practice creates a more favorable microenvironment for the roots, allowing them to grow more robustly.

Why the Other Options are Incorrect:

• A. Carrot: While carrots do benefit from good soil conditions, the practice of capping is not commonly associated with their cultivation. Carrots are typically grown in well-tilled, loose soil to allow for proper root development, and they do not require the same moisture retention strategies as cassava.
• C. Potato: Potatoes are often hilled rather than capped. Hilling involves piling soil around the base of the plant to support tuber development and prevent greening. While moisture management is important for potatoes, the specific practice of capping is not standard in their cultivation.
• D. Yam: Yams are usually grown in mounds or ridges, which helps with drainage and aeration. Similar to potatoes, yams do not typically utilize capping as a cultural practice. Instead, they require specific soil conditions that are different from those needed for cassava.

Summary of Key Points:

• Capping is a cultural practice primarily used in cassava cultivation to retain soil moisture, suppress weeds, and enhance soil fertility.
• It involves covering the soil with organic materials, which decompose and enrich the soil over time.
• Other crops like carrots, potatoes, and yams do not utilize capping as a standard practice, focusing instead on different cultivation techniques suited to their growth requirements.

By understanding the specific cultural practices associated with different crops, students can better appreciate the agricultural techniques that enhance crop yield and sustainability.