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Isabelle Lemay, Jean Caron, Martine Dorais, and Steeve Pepin

improved easily available water (EAW), which reached 0.12 cm 3 of water/cm 3 of bulk volume compared with 0.09 cm 3 ·cm −3 for sawdust without reducing air-filled porosity. Nonetheless, the improvement in EAW had no major effects on tomato plant growth

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important hydraulic characteristics of fresh rice hulls ground at different dimensions (1-, 2-, 4-, and 6-mm diameter). Reduction in particle size increased bulk density and the ability of the media to hold water, but reduced air filled porosity. Particles

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Erin J. Yafuso and Paul R. Fisher

saturation and provide air-filled porosity for oxygen supply to roots, even when irrigated to CC ( Argo et al., 1996 ; DeBoodt and Verdonck, 1971 ). In a typical peat-based substrate, air porosity can be up to 32% by volume at CC in a 1-L container, but this

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Michael R. Evans and Mary M. Gachukia

container grown plants Unwin Hyman London Byrne, P.J. Carty, B. 1989 Developments in the measurement of air filled porosity of peat substrates Acta Hort. 238 37 44 Evans, M.R. 2004 Ground bovine bone as a perlite alternative in horticultural substrates

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Paraskevi A. Londra, Maria Psychoyou, and John D. Valiantzas

over a period of 20 years, sterile, and has a high water retention capacity (57% v/v) ( Werminghausen, 1972 ). Furthermore, UFRF has been found to increase air-filled porosity and water infiltration of fine texture soils and water retention of coarse

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David R. Bryla and Robert G. Linderman

less in plants grown in pine bark than in those grown in a mix of peat, sand, and soil. The pine bark media had volumetric air-filled porosities that fluctuated from ≈40% just after irrigation to 45% 48 h later and matric potentials that fluctuated from

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Anthony LeBude, Amy Fulcher, Jean-Jacque Dubois, S. Kris Braman, Matthew Chappell, J.-H (J.C.) Chong, Jeffrey Derr, Nicole Gauthier, Frank Hale, William Klingeman, Gary Knox, Joseph Neal, and Alan Windham

(horticulture) practices section was presented to show attendees how other factors within the nursery production system can lead to pest and plant disease problems if not managed correctly. Measuring air-filled porosity (AFP) in substrates was a model hands

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Lance V. Stott, Brent Black, and Bruce Bugbee

water, which causes compaction and hypoxia. The air-filled porosity in these studies was preserved with slow, controlled irrigation; and even then, the maximum volumetric water content occurred only after each irrigation at 7- to 10-d intervals. In both

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Erin J. Yafuso, Paul R. Fisher, Ana C. Bohórquez, and James E. Altland

2 containers (7.3-cm diameter × 7.6-cm height). However, water and air balance is highly dependent on container size and shape, with air-filled porosity decreasing from 19% to less than 1% as substrate height decreased from a 15-cm-tall pot to a 1

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Theodore J.K. Radovich, Archana Pant, Ian Gurr, Ngyuen V. Hue, Jari Sugano, Brent Sipes, Norman Arancon, Clyde Tamaru, Bradley K. Fox, Kent D. Kobayashi, and Robert Paull

( Brassica rapa Chinensis group) ( Gurr, 2011 ). The total pore space, water holding capacity, and air-filled porosity were similar for peat and vermicompost used in the study. In early trials, amending peat, coconut coir, and thermophilic compost with