Theres a lot of misunderstanding going on here about both corn and solar power.

Corn is not something that requires ideal or fertile real estate. People imagine corn being grown in the stereotypical midwestern river-adjacent and particularly fertile type of places, like Iowa or Ohio or whatever. The reality is that modern corn production requires a shitload of artificial nitrogen fertilization, so the actual fertility of the land is virtually unimportant. Believe it or not, Texas is actually one of the most productive places for corn farming, and in particularly hot and arid areas where you wouldnt be farming much else. More like typical ranching land, not prime farming land.

Now with solar power, at the current levels of efficiency (and unlike corn), having a cloudy day is a major killer. UV intensity at high elevation can be virtually nothing when it gets a little cloudy. Whereas on a sunny say it would be extremely high. So you need ideally somewhere that is as high altitude as possible, but where it is also sunny almost all the time. There are not a lot of places that meet that description, and even the few places that do are largely very expensive to acquire land in because people want to build houses and hotels and golf courses and whatever else in (or adjacent to) the mountains. Take Pueblo, CO, for example. It’s one of the solar hubs of the US. But its difficult to expand from there because you can either go east, down in elevation, and increase the number of cloudy days. Or you can try to go west and everything becomes exponentially more expensive the closer you get to the Rockies.

More importantly though, corn and solar production necessitate two completely different environments. No one is growing corn in Pueblo, and you wont find many solar fields in places where corn is grown effectively. Because a lot of the time people grow corn where it rains often, therefore those places have many more cloudy days in a year. Realistically you cant just take corn fields and turn them into solar fields