What is mixed cropping? What are the criteria for selecting crops for mixed farming?

Explanation

### Step-by-Step Solution:

1. **Definition of Mixed Cropping**:
Mixed cropping refers to the agricultural practice of growing two or more different crop plants simultaneously on the same piece of land. This method allows for the cultivation of various crops together, which can lead to several agronomic benefits.

2. **Benefits of Mixed Cropping**:
- **Nutrient Balance**: Different crops have varying nutrient requirements. For instance, while one crop may deplete nitrogen from the soil, another may contribute to its replenishment. This balance helps maintain soil fertility.
- **Economic Value**: Growing multiple crops can enhance economic returns as farmers can sell different products, thus diversifying their income sources.
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