The rents paid for this kind of land are relatively minimal in my experience. If you already own it, it's a nice little extra, but that's it. It's not like owning a prime piece of corner real estate where McDonald's or Starbucks will sign a ground lease for $100,000 a year.
Here's a recent example -
https://www.bizjournals.com/albuquerque/news/2017/12/26/nm-leases-hundreds-of-acres-to-california-company.html1,600 acres of land that would probably sell for - at most - $1,000 an acre as ranchland. So that's $1.6 million to buy it, maybe less. The initial ground lease rate is $3,295 per year but increases to $107,222 per year once the windfarm is up and running. Based on the latter number that's a return of 6.7% assuming no expenses (which would frankly be minimal if any). That's not bad but it's not great. They could just as easily pick the 1,600 acres next door where the owner is willing to sign a lease for $100,000 a year since he already runs cattle on the land and the windfarm would do little to interfere with that. Then you're stuck spending over a million dollars to buy land that's only productive use is for ranching.
If you bought a prime piece of commercial land for say $25/SF for an acre site you would spend $1,089,000 but could likely get a ground lease with some fast food restaurant paying $100,000 a year. Plus, you could turn around and sell that for a lot more than the underlying land value, especially if it's a tenant like McDonalds, Chick-fil-A, Starbucks, etc. The former routinely sell at 4% cap rates which would mean a sale price of $2,500,000 if they had a long-term ground lease paying $100,000 a year. That windfarm land on the other hand. Good luck.