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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.
Alfalfa is a cool-season perennial commonly grown for feeding livestock or as a cover crop and soil conditioner. Alfalfa is highly nutritious and a natural source of nitrogen. Itâs ideal for improving the soil and providing erosion control. Alfalfaâs extensive root system nourishes both plants and soil.lfalfa is a cool-season perennial commonly grown for feeding livestock or as a cover crop and soil conditioner. Alfalfa is highly nutritious and a natural source of nitrogen. Itâs ideal for improving the soil and providing erosion control. Alfalfaâs extensive root system nourishes both plants and soil.