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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 establishment (without nurse crop) net cost of $122.46 (total cost minus estimated gross revenue) were amortized over 5 hay production years. 2. Alfalfa-grass establishment (with oat greenfeed nurse crop) net cost of $173.99 (total cost minus estimated gross revenue) were amortized over 8 hay production years.