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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.
Alfalfa is an all-purpose fertilizer and soil conditioner. I use alfalfa on the bit of turf that I have left and on all my gardens. The pellets are an easy way to add organic matter to your soil while topping up the nitrogen. On turf, I rake the pellets in. Otherwise, just as with conventional fertilizer, you will end up with patches of deep green.