TY - JOUR T1 - Effects of Soil Decompaction and Amendment on Root Growth and Architecture in Red Maple (<em>Acer rubrum</em>) JF - Arboriculture &amp; Urban Forestry (AUF) SP - 428 LP - 432 DO - 10.48044/jauf.2007.049 VL - 33 IS - 6 AU - William Hascher AU - Christina E. Wells Y1 - 2007/11/01 UR - http://auf.isa-arbor.com/content/33/6/428.abstract N2 - The TerraventTM soil injection device (Pinnacle Concepts, Ltd., Cornwall, UK) uses compressed nitrogen gas to fracture compacted soil and permits the subsequent injection of liquid amendments. In the current study, we measured fine root growth and architecture in soil that had received one of four treatments: 1) Terravent injections, 2) Terravent injections followed by liquid amendment (MycorTree® Injectable; PHC, Inc., Pittsburgh, PA, U.S.), 3) addition of amendment only, and 4) an untreated control. The experiment was conducted on ten red maples (Acer rubrum) growing on a moderately compacted urban clay soil next to a busy road on the Clemson University campus. Treatments were applied in April 2002. Seven weeks later, soil cores were pulled from locations adjacent to the injection sites, and fine roots (less than 2 mm [0.08 in] in diameter) from each core were washed free of soil. A variety of root parameters were measured, including length, surface area, diameter distribution, and mass. Terravent treatment had no effect on any root parameters measured. Application of MycorTree was associated with small, statistically significant reductions in root diameter, root mass density (mg root/cm3 soil), and root surface area density (cm2 root/cm3 soil). ER -