Tens of thousands of acres of farmland have been leased for oil and gas drilling, a far more profitable enterprise than farming: no expensive machinery to buy, no weather that can wipe out a crop right before harvest, no labor issues.
Better start learning how to grow your own, urban dwellers.
And as a side issue...millionaires are being created at a rate of 2000 a year in North Dakota....mainly oil/gas royalties, pipeline access royalties and a few entrepreneurs.
Oil/Gas leases refer to exploration and drilling. The surface is still farmed/ranched. An oil derrick doesn’t take much space.