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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.
Feeding strictly alfalfa hay, it is not uncommon to have large amounts of calcium with marginal amounts of phosphorus. In addition, the ratio of calcium to phosphorus in some alfalfa hays approaches 15 parts calcium to 1 part phosphorus.