Anew highly nutritious crop is going to be planted in an area where it has never been planted before. which is the most likely outcome of such an event?

It will threaten local biodiversity. 

The new plants planted in an area where they have never been planted before are called introduced species. They can greatly affect local ecosystem. In the new area, they have no natural predators and are able to spread. If they spread beyond the area they are planted, they become invasive species which can overgrow native biotopes and are a great threat to the local biodiversity. This could lead to the extinction of some native species.