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William R. Argo

Acceptable physical properties are an integral part of root-media quality. However, there is no one growing medium that works best in all situations because root-media physical properties are not constant, but rather can be affected by the grower. Understanding the root environment under production conditions requires an understanding of the dynamic nature of air : water : solid ratio in the medium. The objective of this review is to consider key aspects of root-medium physical properties, which include bulk density and particle size, container capacity, media settling, water absorption, rewettability, moisture release characteristics, and water loss due to evaporation from the root-medium surface.

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Karen Mitchell, Elizabeth French, Janna Beckerman, Anjali Iyer-Pascuzzi, Jeff Volenec, and Kevin Gibson

al., 2015 ; Olmo et al., 2016 ; Prendergast-Miller et al., 2011 ). Khan and Shea (2012) concluded that biochar can increase turf root growth in the Jandakot sands of West Australia. We are unaware of any published studies in which the effect of

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Brigitte D. Crawford, John M. Dole, and Ben A. Bergmann

cuttings are rooted. Stock plants are managed to maximize the quantity and quality of cuttings for rooting by starting with juvenile or rejuvenated source material, optimizing physiological status of the stock plant through environment manipulation, and

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James H. Aldrich and Jeffrey G. Norcini

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

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L.E. Datnoff and R.T. Nagata

Abbreviation: CR, corky root. 1 Assistant Professor of Plant Pathology. 2 Assistant Professor of Horticulture. Florida Agricultural Experiment Station, Journal Series no. R-01644. We thank South Bay Growers for their assistance in conducting these

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Arthur Villordon, Don LaBonte, Julio Solis, and Nurit Firon

Koshimizu and Nishida (1949) measured LR branching in sweetpotatoes and postulated that LR branching may be very important “to supply the internal growth elements” for storage root formation. Pardales and Yamauchi (2003) studied sweetpotato LR

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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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Lisa E. Richardson-Calfee, J. Roger Harris, Robert H. Jones, and Jody K. Fanelli

Root systems of most nursery-grown landscape trees extend well beyond the edge of the canopy. As a result, when large (greater than 2 m tall) field-grown trees are harvested for transplanting, only a small portion of the root system is moved and a

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Chrislyn Ann Particka and James F. Hancock

Black root rot (BRR) is a widespread disease of strawberry that causes the death of feeder roots and the degradation of structural roots resulting in an overall decrease in productivity ( Maas, 1998 ). By the 1950s, BRR had been reported in many

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Jason D. Lattier, Hsuan Chen, and Ryan N. Contreras

labeling techniques, such as fluorescent in situ hybridization and genomic in situ hybridization, and has proven valuable for characterizing hybrids in woody plants with small chromosomes ( Van Laere et al., 2010 ). Current root tip cytology consists of