How many bales of alfalfa can you get from an acre?

That all depends on the size and type of bales you have, as well as the forage biomass of that field. Bales come in not just one size, they come in small square, large square, small round and large round bales. Forage biomass is also different from year to year, depending on current seasonal conditions (moisture, sunlight, soil) for your area.