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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 If you buy it at the feed store, it will cost $2 more. 2  Basing it on pick up price, Alfalfa hay will come out $0.16 per pound multiplied by the weight of the horse, and its daily consumption will cost around $4.40 per day for hay. For instance, daily feed for a horse in North California area, for both hay and grain, will cost around $4 to $8 per day. 2  Monthly expenses can run to $130 to $275.