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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.
However, a seeding. rate of more than 1 bu oats per acre will hurt the alfalfa more. Further, the. alfalfa, when severely stressed in the seeding year, will yield less in all future. years as shown by the data in Figure 2 where ryegrass seeded at more than. 4 lbs/a reduced yield of alfalfa in the next year.