Fertilizing Landscape Trees and Shrubs
http://www.ext.vt.edu/pubs/nursery/430-018/430-018.html
Tree and shrub fertilization is especially important in urban and suburban areas of Virginia where soils have been altered due to construction. These urban soils tend to be heavily compacted, poorly aerated, poorly drained, and low in organic matter. Even where soils have not been affected, fertilization may be needed as part of a maintenance program to increase plant vigor or to improve root or top growth.
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Fertilizing Trees and Shrubs
http://www.ext.vt.edu/pubs/envirohort/426-715/426-715.html
In urban or suburban neighborhoods, trees and shrubs often need fertilizing. Modern home- building methods create adverse growing conditions for plants. Often, good topsoil is completely removed and not replaced. Heavy machinery scrapes and compacts fertile soil, reducing its aeration and drainage. Plants are crowded by streets and sidewalks, and must compete with grass for nutrients. Proper fertilization is especially important to landscape plants in this type of environment.
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Making Nitrogen Available to Trees
http://www.forestry.uga.edu/warnell/service/library/index.php3?docID=278
Nitrogen affects the molecular interactions, compound shapes and functions, and the chemical symmetry of life-maintaining materials. In ecosystems, nitrogen is the most precious of elements--carefully used, relentlessly recycled, and biologically hoarded.…
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Nitrogen Prescriptions for Trees
http://www.forestry.uga.edu/warnell/service/library/index.php3?docID=283
Supplemental nitrogen fertilization should be treated as a fined-tuned, carefully considered, constantly modified, whole tree prescription process. The whole tree wins or loses with the changing reactions of one major organ or resource.
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