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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.
I thought this would be a good time to review alfalfa's nutrient needs. In general, alfalfa removes 12.5# Phosphorus (P), 40-50# Potassium (K), 30# Calcium (Ca), 6# Magnesium (Mg), 6# Sulfur (S) and 0.08# Boron (B) per ton of dry matter yield. Plants may remove higher amounts of these nutrients if soil test levels are in the High (H) or Very High (VH) levels.