To increase crop yields,farmers use crossbreeding,genetic engineering,and polycultures of perennial crops.

Genetic Engineering

The direct manipulation of an organism's genes using biotechnology, altering the genetic makeup to achieve desired traits.

Crossbreeding

The process of breeding an animal or plant with another of a different breed, variety, or species to create offspring with desired characteristics.

Polycultures

Farming practice that grows multiple species of plants together to mimic the diversity of natural ecosystems.