Correlating Foliar Nitrogen Levels with Growth in two Landscape Tree Species    (View PDF)

Ed Perry and Gary W. Hickman

Abstract: Trials were conducted to determine the effect of applied soluble nitrogen fertilizer on leaf nitrogen concentrations and growth in valley oak (Quercus lobata) and Chinese pistache {Pistacia chinensis) trees. Leaf nitrogen concentrations in valley oak were not significantly affected by the fertilizer at 3,9,16, and 28 months following treatment. Leaf nitrogen concentrations in Chinese pistache were not significantly affected by the fertilizer at 9 and 12 months following treatment. The fertilizer treatments did not cause increases in trunk diameter growth in either species over the period of the study. Additionally, no correlation could be made between visual nitrogen deficiency symptoms and actual leaf nitrogen concentrations. Keywords. Nitrogen fertilization; ornamental tree nutrition; leaf analysis; Quercus lobata; Pistacia chinensis.

Keywords: Nitrogen fertilization; ornamental tree nutrition; leaf analysis; Quercus lobata; Pistacia chinensis.

https://doi.org/10.48044/jauf.1998.019