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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.
It was good that this grower had all of his information collected when he called this week because fall is the time to fertilize! It is recommended that phosphorus applications are scheduled sometime between October and February because it takes 60-90 days for alfalfa to fully respond to the fertilizer application.