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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.
As the old saying goes, âPut it (fertilizer) on, donât put it offâ. Following first harvest is an excellent time to apply fertilizer. Letâs discuss some aspects about phosphorus, potassium, sulfur, and boron fertilization for alfalfa hay. A soil test is the starting point for a fertilizer program for any crop.