If fire blight is a concern, minimize nitrogen. Otherwise: 1/2 cup 13-13-13 in 2-ft circle at growth start (new trees). Increase 1/2 cup/year to 2 cups at year 4. Maintain 2 cups/year for mature trees. Stop if blight appears. Lawn-fertilized trees may need less. Apply spring, keep 6" from trunk.
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