TY - JOUR T1 - Correlating Foliar Nitrogen Levels with Growth in Two Landscape Tree Species JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 149 LP - 153 DO - 10.48044/jauf.1998.019 VL - 24 IS - 3 AU - Ed Perry AU - Gary W. Hickman Y1 - 1998/05/01 UR - http://auf.isa-arbor.com/content/24/3/149.abstract N2 - 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. ER -