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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: Alfalfa has about 4 - 5% protein in flake form, 8 - 10% protein in bale form since it's compressed more as a bale. It depends, because it can vary. The only way to know for sure is to have your particular hay tested, because the amount of protein can differ based on several factors. In general you're looking at about 16% crude protein, but it can vary between 13 and 20%. http://www.ca.uky.edu/agc/pubs/agr/agr13...