Instead of getting 1.25 tons/acre in each of the next three years for a total 3.75 tons/acre or five bales per acre, she expects to maintain 2.0 tons/acre/year for a total of 6.0 tons/acre or eight bales/acre. That's an increase of 2.25 tons/acre (6.0-3.75), or 4,500 lbs. as-fed with 3,915 lbs. DM.