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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.
By offering grass hays on a free-choice basis and limiting the amount of alfalfa, a good balance can be obtained. A simple formula to decide how much alfalfa to feed will enable the caretaker to monitor this intake. Take 1-2% of the horseâs body weight and divide this by four. This will give the appropriate poundage of alfalfa to give the horse daily in addition to grass hay. For example; in the summer, Jake a 1000 lb.