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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.
We usually get four cuttings per season on our alfalfa. We bale it up, and feed it to our sheep and goats. Then, we replant the crop every few years or so. Agronomist Stephen Barnhart says before planting alfalfa, test the soil to make sure you have the proper amount of nutrients such as phosphorous and potassium. Alfalfa also prefers a neutral pH level. Another test to do is checking for herbicide carryover.