The traditional practice of shifting cultivation (jhum) in Manipur often involves growing mixed crops (rice, millets, vegetables). This is because jhum is a sustainable agricultural practice that allows the land to regenerate after each harvest. By growing a variety of crops, farmers can ensure that the soil is not depleted of nutrients. Additionally, mixed cropping helps to control pests and diseases.
Single crop monocultures are not sustainable in the long term, as they can lead to soil erosion and nutrient depletion. Cash crops like ginger and turmeric are also not ideal for jhum cultivation, as they require more intensive farming practices. Plantation crops like tea and coffee are even less suitable for jhum, as they require large areas of land and intensive management.
Therefore, the correct answer is: Mixed crops (rice, millets, vegetables).