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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.
Posted 07 October 2008 - 03:47 PM. I dont know if this helps but i allways soil test, then put on what it says plus 50 or 100 pounds of nitrate , I cut my pasture for cattle hay then let theme graze it, and yes this all happens in the spring but in the fall ive been told alfalfa is best ferdlized in the fall.