The method of producing new variety of crops that are superior to the existing varieties is known as __________

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the method used to produce new varieties of crops that are superior to existing ones. This implies a process that involves improving the genetic traits of plants.

2. **Identifying the Process**: The process of creating new plant varieties involves selecting plants with desirable traits and breeding them to enhance these traits. This is a systematic approach to agriculture.

3. **Defining the Term**: The method of producing new varieties of crops that are superior to the existing varieties is known as "plant breeding." This term encompasses various techniques used to select and propagate plants with desirable characteristics.

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