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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.
Best Answer: Depends on a lot of things-what kind of hay, irrigated or not, location, season, etc. - but where I'm from in Colorado an alfalfa/rye mix, irrigated, will usually yield about 2 1/2 - 3 tons per acre, per cutting, for the first two cuttings.hat means the hay was harvested on average three times, during the growing season, to attain the 5-6 tons per acre. Some farmers are getting 8 tons per acre of alfalfa hay, and a few are getting 12 tons per acre, with exceptional management, and usually the application of additional fertilizers. A ton is 2000lbs.