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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.
The amount of decay product in the batch of alfalfa mix or soil can be measured by the smell it puts off. The better and more powerful the smell, the better it will work as fertilizer because the plant roots will work with the microbes to uptake nutrients. Here is the recipe if you want to give this a try: