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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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Sven E. Svenson and Timothy K. Broschat

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

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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

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David I. Yates, Brandi L. Earp, Foster Levy, and Elaine S. Walker

To improve the success of vegetative propagation of Sciadopitys verticillata, stem cuttings were subjected to three treatments designed to minimize the accumulation of a latex-like sap at the cut ends of stems. A 24-hour soak in water before a hormone dip significantly enhanced rooting success and root mass. The water soak pretreatment was more beneficial to hardwood cuttings compared with softwood cuttings. Cuttings from shade-grown source trees showed the highest rooting success, but source tree age, height, and place of origin were not important factors. The water-insoluble latex-like sap had strong antibacterial activity against 3 of 11 bacterial species tested, but activity was not related to bacterial Gram reaction or the bacterial natural environment. In contrast, pine resins and latexes from selected angiosperms showed no antibacterial activity. The antibacterial component of the Sciadopitys latex-like sap was heat stable and therefore probably not protein based.

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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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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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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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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