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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.
If you want to add nitrogen to your soil, try using alfalfa meal or the alfalfa pellets sold for rabbit feed, instead of blood meal or fish emulsion. Alfalfa is a quick-acting source of nitrogen, with healthy amounts of phosphorus and potash.