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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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Brian E. Jackson, Robert D. Wright, and Michael C. Barnes

amendments (fines) to PTS could be improvement of the hydrophysical properties such as hydraulic conductivity, which has been shown to be much higher in PTS than PL ( Jackson and Wright, 2009a ). The improvement of PTS hydrophysical properties (rewettability