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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.
The ï¬xation of nitrogen in alfalfa roots by the bacte-. ria Rhizobium meliloti is optimized between a soil pH of. 6.2 and 7.5. Use lime to establish new alfalfa stands and to. ensure high yields the ï¬rst two years after seeding if the pH. of the topsoil is 6.2 or less. Once alfalfa roots penetrate deep.