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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.
High-quality alfalfa has 20 percent to 25 percent more calories per pound than typical grass hay or pasture grass. If your horse is in a heavy work and competition program, his energy requirements are much higher; alfalfa may be a good choice for him.