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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.
To determine how many gallons of a particular liquid fertilizer are needed per acre, use the following equation (Burt, O'Connor, and Ruehr 1995): For example, the IFAS recommendation for commercial tomato production in Florida is 200 pounds of N per acre.The injection rate would be 1.5â2.5 pounds per acre per day from 1 through 13 weeks after planting (Olson et al. 2012).For this example, assume 2 pounds per acre per day for a particular fertigation event and 10 acres to fertigate.o determine how many gallons of a particular liquid fertilizer are needed per acre, use the following equation (Burt, O'Connor, and Ruehr 1995): For example, the IFAS recommendation for commercial tomato production in Florida is 200 pounds of N per acre.