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Pauline H. Andrews and P. Allen Hammer

–17906 of the Purdue University Office of Agricultural Research. We thank The Scotts Company for supplying root media and Oglevee Ltd. for supplying rooted cuttings for this study.

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Taryn L. Bauerle, William L. Bauerle, Marc Goebel, and David M. Barnard

moisture for root uptake a challenge ( Daniels et al., 2012 ). Given that water uptake by plant roots is the primary driver of soil moisture depletion in irrigated crop production systems ( Clothier and Green, 1994 ), surprisingly few studies report how

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David H. Suchoff, Christopher C. Gunter, and Frank J. Louws

The efficacy of herbaceous grafts relies on the replacement of a scion root system with that of a rootstock with known disease resistance. The use of disease-resistant rootstocks in grafted tomato production has proven efficacious in managing

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Arthur Villordon and Jeffrey C. Gregorie

). Investigations of B deficiency in plants show that B is necessary for proper plant development, as it leads to root, leaf, flower, and meristem defects (reviewed in Matthes et al., 2020 ). Cumulative evidence appears to support the hypothesis that root growth is

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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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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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Nahla V. Bassil, William M. Proebsting, Larry W. Moore, and David A. Lightfoot

Hazelnut (Corylus avellana L.) softwood cuttings of the cultivars Ennis and Casina were propagated under mist during June and July 1987 and 1988. Rooting of stem cuttings was stimulated by both Agrobacterium and IBA treatment; however, IBA caused nearly complete bud abscission. Better rooting and bud retention were observed in `Casina' than in `Ennis' in 1988. Bud retention on Agrobacterium -inoculated cuttings improved as the cuttings approached the semi-hardwood stage. Six months after transplanting, Agrobacterium -inoculated hazelnut cuttings had an extensive root system, characteristic of hairy root. Although the mechanism remains unclear, strains of Agrobacterium rhizogenes are effective rooting agents in hazelnut and may cause less bud abscission than IBA. Chemical name used: 1 H -indole-3-butyric acid (IBA).

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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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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