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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.
That's why alfalfa is such a great crop to 'scrub' N from soil water, since it's uptake level is so high (300-900 lbs N/acre per year). It's higher than corn, and because it's cut 5-9 times, one can apply every cutting.