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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.
Use alfalfa meal to make a foliar tea that will quickly green up your plants! 1  Alfalfa Meal, 2.8-0.29-2.4, 40 lb bag SKU: 1308901. 2  Description. 3  Instructions. Shipping Info.  Technical.