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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.
1 Feed: The cost of alfalfa hay in Southern California varies between $9 and $12 per bale, depending on the season and the feed store. 2  Grain costs about $9 per 50 pound bag. 3  One mature dairy goat eats approximately 1 bale of hay every 2 weeks.