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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.
In general, however, about 0.5 cup (about 113 g) of alfalfa meal should be used for each plant. For an entire garden or field, as much as 5 lbs (about 2.4 kg) of alfalfa meal can be used for every 100 square feet (about 9.3 square m).