What are the main characters required in a crop during its improvement practices?

Explanation

To answer the question about the main characteristics required in a crop during its improvement practices, we can break it down into several key points:

### Step-by-Step Solution:

1. **Disease Resistance**:
- An ideal crop should possess resistance to diseases. This characteristic is crucial because if a crop is susceptible to diseases, it will struggle to grow and produce effectively. Disease-resistant crops can withstand various pathogens, ensuring a healthier yield.

2. **Response to Fertilizers**:
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