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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.
The cost of alfalfa seed averages $4 to $9 per pound, as of 2015. However, alfalfa seed generally costs less per pound when you buy in bulk. For example, HancockSeed.com sells 1-pound bags of seed for $9.50 and 5-pound bags for $28.99.