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Figure 3. A multi-year Purdue study found that the highest alfalfa yields were recorded when fertilizer rates were 50 pounds of P 2 O 5 per acre per year, and 200 pounds or more of K 2 O per acre per year.igure 3. A multi-year Purdue study found that the highest alfalfa yields were recorded when fertilizer rates were 50 pounds of P 2 O 5 per acre per year, and 200 pounds or more of K 2 O per acre per year.
Alfalfa seed yields generally average from 150-200 pounds per acre statewide; however, individual yields of 500-1100 pounds per acre have been reported. After the seed crop is harvested, if there is adequate moisture, another hay crop may be harvested, or the stand may be grazed by cattle during the fall.