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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.
Alfalfa should be seeded at 15 to 20 lb of seed per acre for pure alfalfa stands. When moisture, timing, and seed-bed preparation are optimum, the lower rate can be used. When conditions are less than optimum, use the 20-lb/acre rate.lfalfa should be seeded at 15 to 20 lb of seed per acre for pure alfalfa stands. When moisture, timing, and seed-bed preparation are optimum, the lower rate can be used. When conditions are less than optimum, use the 20-lb/acre rate.