Apple trees should be fertilized each year in the spring. For optimum tree growth and fruit quality, conduct a soil test every two to three years to determine the appropriate fertilizer and application rates. Refer to Table 2 for suggested fertilizer application rates. Apply the recommended fertilizer as a broadcast over the area under the tree drip line. If trees are not grown in sod, reduce the amount by half.
Apples reach maturity at different times, depending on variety and climate.
There is not a specific date at which you can expect to harvest your apples. Instead, you can observe your apples as they grow and inspect the fruit for certain changes that indicate maturity. Flesh color also loses its greenish tint and turns yellow or white. A mature fruit will be crisp and juicy. A pleasing taste is the final indicator of fruit maturity.