Explanation:

Ans. Relay cropping 

Relay Cropping: Example- Planting maize, then sowing beans between the maize rows four weeks later.

Relay Cropping the process of growing one crop, then planting another crop (usually a cover crop) in the same field before harvesting the first. This helps avoid competition between the main crop and the intercrop. It also uses the field for a longer time, since the cover crop usually continues to grow after the main crop is harvested.