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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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M. Gabriela Buamscha, James E. Altland, Dan M. Sullivan, Donald A. Horneck, and James Cassidy

available on the chemical and physical properties of DFB as it pertains to use as a container substrate. Most literature on this subject refers to the chemical properties of soluble components extracted for pulpwood or other industrial chemical purposes

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James E. Altland and Charles R. Krause

objective was to determine the influence of substituting PB at commercial nursery operations with commercially harvested and processed PW on substrate physical properties. Materials and Methods Chipped pine ( Pinus taeda ) logs, including bark and wood but

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Jordan M. Craft, Christian M. Baldwin, Wayne H. Philley, James D. McCurdy, Barry R. Stewart, Maria Tomaso-Peterson, and Eugene K. Blythe

). Hollow-tine aerification, also known as core aerification, is an effective practice that physically removes a soil core to improve soil physical properties. Research has shown that HT aerification improves water infiltration and reduces VWC in putting

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James E. Altland, James S. Owen Jr., and Magdalena Z. Gabriel

reduction in substrate volume results in a change in physical properties that affect AS and CC. Aendekerk (1997) showed the relative decomposition and shrinkage of several peat sources as a function of substrate pH and sub-irrigation level. While pH and

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Johann S. Buck and Michael R. Evans

significantly different from those grown in parboiled fresh rice hull-containing substrates. Sambo et al. (2008) reported the physical properties of various ground nonparboiled fresh rice hulls. No fresh ground rice hulls products passed through 1-, 2-, 4

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Eugene K. Blythe and Donald J. Merhaut

The physical properties of container-growing substrates, particularly air space, container capacity, and bulk density, have a significant impact on plant growth, and knowledge of these properties is essential in properly managing nursery

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Michael R. Evans, Giampaolo Zanin, and Todd J. Cavins

-value was reduced. This concurs with previous research in which it was demonstrated that adding perlite up to 20% had little effect on the physical properties of the substrate ( Evans and Gachukia, 2007 ). However, adding 30% perlite reduced water

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Paolo Sambo, Franco Sannazzaro, and Michael R. Evans

by the blending of two or more components such as peat, composted bark, perlite, whole rice hulls, or vermiculite ( Hanan, 1998 ; Nelson, 2003 ). Substrates are designed to have appropriate physical properties for specific crops and growing

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Jean-Charles Michel

these additives is often evaluated in terms of their effects on physical properties such as water-holding or air-filled capacity ( Bunt, 1983 ; Martinez et al., 1997 ) or indirectly during the growing ( Rivière et al., 1995 ) and rarely in terms of