Nutritional Requirements of Apples in Home Fruit Plantings

Generally, apple trees need fertilizing each year.
Nutritional Requirements of Apples in Home Fruit Plantings - Articles
Nutritional Requirements of Apples in Home Fruit Plantings

Nitrogen is the most important essential nutrient. Two other nutrients, phosphorus and potassium, are needed in relatively large amounts when the tree is young; however, after it reaches maturity, it usually requires only nitrogen.

Broadcast 8 ounces of 10-10-10 over a 2-foot circle about 1 month after planting. Keep the fertilizer 6 inches away from the trunk and broadcast it evenly over the recommended area. Do not put any fertilizer in the hole before planting. In June following the planting, broadcast another 8 ounces of 10-10-10 around the tree. Increase the amount of 10-10-10 applied by 0.25 pound per year to 2.5 pounds per tree for a dwarf tree, 5 pounds per tree for a semidwarf, and 10 pounds per tree for a standard tree. Maintain pH at 6.0 to 6.5. (See The Home Fruit Planting: Getting Startedfor more information on fertility and fertilizers.)