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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.
Key Words: Nutrients, essential elements, visual symptoms, fertilizer, nitrogen, phosphorus, potassium, magnesium, sulfur, boron, molybdenum. There are 18 nutrients essential or beneficial for the growth of alfalfa which can be classified.