Yes.
Organic fertilizers such as compost, manure and decomposed leaves can be used to provide nitrogen and other nutrients. Synthetic fertilizers should only be applied under the tree three months before budding begins in order to allow it time to work its way down into the root system for maximum benefits. When applying synthetic fertilizer, select one containing higher levels of Phosphorous than Nitrogen (Phosphorus is a nutrient that encourages root development).
Different types of trees vary with regard to their need for summer or fall application but will often benefit from 1" Around the trunk and outer branches at the drip line each year...