RT Journal Article SR Electronic T1 Predicting Root Spread From Trunk Diameter and Branch Spread JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 85 OP 89 DO 10.48044/jauf.1988.021 VO 14 IS 4 A1 Edward F. Gllman YR 1988 UL http://auf.isa-arbor.com/content/14/4/85.abstract AB Trunk diameter and branch crown spread were linearly correlated with root spread in honeylocust (Gleditsia triacanthos var. inermis), green ash (Fraxinus pensylvanica),poplar (Populus x generosa), red maple (Acer rubrum) and southern magnolia (Magnolia grandifiora) but not in live oak (Quercus virgìniana). Maximum root spread (excluding live oak) ranged from 1.68 times the dripline for ash to 3.77 for magnolia. Mean maximum root spread was 2.9 times the dripline. Roots growing farthest from the trunk were consistently near the soil surface.