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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.
If the recommended amount of 8-32-16 fertilizer for new garden soil is 4 #/100 sq. feet, the amount of this fertilizer needed for a 4 ft. X 8 ft. raised bed is 1.25 pounds. One pound of granular fertilizer equals two cups. The fertiliz-er should be spread on the soil before planting and raked in.