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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.
Since alfalfa roots quickly, it doesnât require deep plantingâonly about a half inch deep. Merely sprinkle the seeds evenly onto the soil and cover lightly with dirt. Use about Â¼ pound of seeds per 25 square feet and space rows about 18-24 inches. You should begin to see sprouts within seven to 10 days.