Because the root system of a newly planted tree is limited, fertilization is not always recommended at the time of planting.  Excessive fertilizer salts in the root zone can be damaging and can lead to increased water stress. If fertilizer is used in the first growing season, application of a slow-release nitrogen fertilizer is suggested.  Nitrogen stimulates root growth and may be beneficial when applied in conjunction with proper watering practices.     Contact Appalachian Tree Service for an evaluation of your newly transplanted trees along with the other trees and plants in your landscape.