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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.
Good-quality alfalfa hay that cost about $12 per bale in January is now running about $18 at local feed stores. In some cases, prices have nearly doubled in the past year, in a run-up blamed on short supplies and keen demand for hay in drought-stricken areas like Texas, as well as overseas demand in China and Japan.