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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.
I use alfalfa meal (along with dehydrated chicken manure) as fertilizer in my garden. The alfalfa meal, when added to soil, heats up for a while (haven't measured how much but it gets warm like a compost pile if you use enough).