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

Plant breeding:

1. Plant breeding is a technique by which traits of plants are changed to get desired characteristics.
2. It is a part of crop variety improvement in which plants are genetically modified for better yield.
3. The crops produced by plant breeding have the following characteristics:
   • New varieties of crops are superior to the existing varieties in terms of both quality and quantity.
   • Resistance to diseases.
   • Better response to fertilizers.

Final answer: The method of producing a new variety of crops that are superior to the existing varieties is known as plant breeding.