RT Journal Article
SR Electronic
T1 The Effect of Broadcast Nitrogen Fertilization Rates and Placement on the Growth of Green Ash Trees
JF Arboriculture & Urban Forestry (AUF)
FD International Society of Arboriculture
SP 179
OP 182
DO 10.48044/jauf.2010.024
VO 36
IS 4
A1 Gary Watson
YR 2010
UL http://auf.isa-arbor.com/content/36/4/179.abstract
AB Tree responses to slow-release nitrogen fertilization treatments were limited, but application of fertilizer to the inner half of the root zone improved caliper growth and relative chlorophyll content. Concentrating nitrogen fertilizer applications closer to the base of the tree may be able to take advantage of naturally higher root density, in addition to any further root stimulation resulting from the applied fertilizer treatment. The study site was moderately fertile, as are many urban landscapes where lawn and planting beds surrounding trees are fertilized. The pre-existing level of fertility may have contributed to the limited growth response to the nitrogen applications.