Fertilization is extremely important for a healthy tree, with Nitrogen being the most essential nutrient a tree needs. Nitrogen occurs in natural environment (like a forest), because leaves and wood r READ MORE http://www.allabouttreecare.com/learn.html
Björkman, Erik (1970). Mycorrhiza and tree nutrition in poor forest soils. Technical Report. Stockholm: Faculty of Forest Sciences, Sveriges lantbruksuniversitet. Studia forestalia Suecica ; 83
A READ MORE http://pub.epsilon.slu.se/5807/