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Erick G. Begitschke, James D. McCurdy, Te-Ming Tseng, T. Casey Barickman, Barry R. Stewart, Christian M. Baldwin, Michael P. Richard, and Maria Tomaso-Peterson

and Coats, 1994 ; Johnson, 1996 ). Many sod producers use preemergence herbicides, such as prodiamine, pendimethalin, and dithiopyr, to control these grassy weeds. However, many preemergence herbicides may hinder root growth and establishment of

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Michael A. Arnold

122 WORKSHOP 16 Quality and Management of Tree Root Systems: Current Status and Future Directions

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John Watson, François Hébert, Eric M. Lyons, Theo Blom, and Katerina S. Jordan

lead to increased frequency of mowing. Furthermore, excess nitrogen may also reduce root depth and density ( Bowman et al., 1998 ; Schlossberg and Karnok, 2001 ) and nutrient uptake ( Bowman et al., 1998 ). Three additional factors that can impact

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Steven E. Newman and Jesse R. Quarrels

143 POSTER SESSION 23 (Abstr. 849-859A) Ornament&/Floriculture: Weed & Root Growth Culture

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Almudena Montoliu, Aurelio Gómez-Cadenas, and Rosa M. Pérez-Clemente

-scale propagation of several woody species such as Vitis , Prunus rootstocks, Malus , and so on ( George et al., 2008 ). However, in many others species, adventitious root formation is still a major problem. Root formation of woody species was found to be

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Sven E. Svenson and Timothy K. Broschat

143 POSTER SESSION 23 (Abstr. 849-859A) Ornament&/Floriculture: Weed & Root Growth Culture

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Jesús Gallegos, Juan E. Álvaro, and Miguel Urrestarazu

The response of roots to mechanical impedance has intrigued horticulturists, plant biologists, and substrate physicists for at least two centuries ( Araki and Iijima, 2001 ; Atwell, 1993 ), whereas the model of root growth as a function of multiple

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Fucheng Shan and Kevin Seaton

, involving the establishment of mother vines from which dormant cuttings are taken for rooting or bench grafting, are relatively slow and not suited to rapid multiplication for commercial cultivation for newly released cultivars ( Singh et al., 2004 ). Mother

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John M. Ruter and Dewayne L. Ingram

125 ORAL SESSION (Abstr. 624-630)Root Environment

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Edward L. McCoy

Root zone amendments are typically organic materials or inorganic materials of diverse mineralogy that when added to sand at modest rates of 5% to 20% by volume are capable of substantially and permanently altering the physical and chemical