Rarely.
1) need to know the local going rate per acre
2) need to know the relative profit per acre
3) need to know the local rents per acre
4) need to know those 3 numbers compute to lead to profit. There can be gains from inflation and relative land value increasing, too; which is part of why Bill Gates and others are looking into farm land.
My local area, farmland is going anywhere from 5k to 30K per acre depending upon size of land, location, and other numerous variables.
Local crops at best can conservatively count on grossing $400 per acre. $500 per good year. But definitely less in bad year. Simply doing a hay crop, count on normal overhead of 50% - (not including major break downs of equipment).
Seeds, fertilizer, diesel, storage of crops, twine/wrap, transport of crop to market/destination, machine breakage, tractor breakage, maintenance, etc
Rents per acre in my area go for $30-100 per acre, but really $50-60 is most common.
So you have 100 acres here locally, renting for $60 = $6000/year. Now minus your land monthly payments, property taxes.... Not really left with much, unless you paid cash up front for whole land, no bank loan. Then you need to think, is farm land, $800k for that 100 acres? the best investment or, was a VOO, SPY etc better for that 800K? If you did the haying yourself, grossed $400/ac, but Net is $200/ac; that's 20K before taxes.
A dividend yield stock like PTY, NLY, FDUS, etc could get ~10% per year, so that 800K gets 80K in dividends.
Pretaxes: 80K is > 20K > 6K