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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.
Step 3. Use a high-phosphorus fertilizer, such as 0-18-0 or 0-46-0, to encourage blooms. Bone meal is a good organic phosphorus source which gives good results. Hydrangeas will produce lovely green leaves if you use a balanced fertilizer, but they need high phosphorus to produce the best flowers. Work phosphorus fertilizer into the soil early each spring.