The stated objective for fertilization with typically fall into 3 categories:
1. Correcting a Nutrient Deficiency.
2. Maintenance fertilization.
3. Growth Promoting Fertilization.
Fertilizer Types: are defined by their chemical composition, form, and mode of action
Fertilizer Application Methods: 4 methods of delivering fertilizer to a tree: broadcast application, sub-surface application, trunk injection, and foliar application.
Rate of Application: ANSI A300 standards (“N” content)
Maintenance fertilization – 1bls (0.5kg) per 1000ft2 (93m2)
Maximum fertilization fast release – 3bls (1.4kg) per 1000ft2 (93m2)
Slow release – 6bls (2.7kg) per 1000ft2 (93m2)
Growth promoting fertilization – 2bls (0.9kg) per 1000ft2 (93m2)
Timing of Application: When the tree can use it! Best time to apply is just as leaves expand
Prescription Fertilization & Nutrient Management Plan: nutrient management plan should address the “tree(s)” needs based on species, growth phase, health, and soil’s ability to meet annual demands for essential elements. The plan should also identify potential limiting factors for maximum tree health. Remember fertilizer helps trees in many ways, however the misapplication can seriously affect the health and longevity of a tree and have tremendous affects on the environment.