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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.
Apply the fertilizer at a rate of no more than 1 pound of nitrogen per 1,000 square feet of lawn. more info on figureing out fertilizers . After the first fertilization, follow the UF/IFAS guidelines for annual lawn fertilization for your grass species and your location.