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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.
year of corn silage following alfalfa, 50 pounds of nitrogen per acre was credited. The first year. application of manure was credited at 3 pounds of nitrogen per ton, 3 pounds of P2O5 per ton, and. 7 pounds of K2O per ton.