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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.
Counties with 5000 or more acres of Alfalfa in 2001. Cultural Practices Alfalfa is normally planted at 15 to 20 lb of seed per acre for pure alfalfa stands. When moisture, timing, and seed-bed preparations are optimum, a lower rate of 10-12 lb of seed per acre can be used. Alfalfa can be planted in either spring or fall. Make spring seedings usually March 15 to April 15 in prepared seedbeds after danger of late freeze has passed.