Good fruit tree fertilizers include superphosphate, balanced fertilizers, bone meal and chicken manure. Fruit trees are different from other trees in that they don't need as much nitrogen. Giving too much nitrogen to a fruit tree causes it to grow large amounts of foliage but very little fruit.
Gardeners use fertilizers that are high in phosphorous or potassium, such as superphosphate, to promote flowering and fruiting. Bone meal is an organic fertilizer option that contains large amounts of phosphorous and is an alternative to superphosphate. Chicken manure’s highly concentrated phosphorous content makes it ideal for use with fruit trees. However, gardeners should compost chicken manure before application because too much phosphorous could damage the tree.