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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.
Collecting soil and irrigation water samples is the ï¬rst. step in determining fertilizer and lime needs for alfalfa. Col-. lect soil samples at any time of the year from a depth of 0. to 8 inches every three to ï¬ve years to determine soil pH, soil buffer pH and phosphorus and potassium needs.