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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.
The soil test will also give you the specifics for how much fertilizer to apply. Since clover is a legume, it does not require as much nitrogen unless you are planting it in a blend with a cereal grain like wheat, oats or rye. When planted alone, clover can be established with 300 pounds of 5-10-15 per acre. Soil preparation is critical to ensure good establishment of this crop.