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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.
To take a closer look at the issue of alfalfa seeding rates, letâs start at the beginning with the seed itself. One of my references indicates that there are 199,000 alfalfa seeds per pound. If that one pound was evenly spread over one acre (43,560 ft.2), there would be in the neighborhood of five seeds per square foot.