Work Item
ASTM WK61127

New Test Method for Determining the Total Porosity, Container Capacity and Air Space of a Growing Media utilizing a Porometer

1. Scope

2.1 Scope The scope of the Committee shall be: The promotion of knowledge; stimulation of research; the development of specifications and methods for sampling and testing; and the development of terminology, definitions, and practices relating to the physical and chemical properties and behavior of soil, rock, and the fluids contained therein. Included are the physical and chemical properties and behavior of: soil-like materials and fluids occupying the pore spaces, fissures and other voids in soil and rock insofar as such fluids may influence the properties, behavior and uses of the soil and rock materials. Excluded are the uses of rock for building stone and for constituent materials in portland cement and bituminous paving and structures coming under the jurisdiction of other committees of the Society.

2.2 Interest Area The areas of interest of the Committee are soil, rock, powders, and such materials that may be intimately associated with soil and rock. . It will be the policy of this Committee to avoid, insofar as possible, dealing with methods of design of engineered structures and all those features of general practice in the use of soil and rock which may not involve the development of standards. It will, however, be considered within the scope of the Committee's work to promote by every desirable means the close cooperation of other organizations and committees whose field of endeavor is closely allied to that of the Committee.


Greenhouse growing medium, propagation substrate or media


Container growers worldwide must understand the physical properties of their growing media, specifically container capacity (Water Holding) and air space of their substrate. Roots require a careful balance of both for optimal growth. The porometer, developed by NC State over 2 decades ago is utilized by professional growers and soil blenders around the world for measuring these physical properties. Third party labs charge fees to measure growing media properties utilizing the porometer. There isnt a test method for using the apparatus, only published papers detailing various parameters of the test. Significantly inconsistent results can be reported within a single lab through technician bias alone. It is imperative that we develop a test method for operating the porometer that allows for repeatability of results.

The title and scope are in draft form and are under development within this ASTM Committee.


Developed by Subcommittee: D18.22

Committee: D18

Staff Manager: Katerina Koperna

Work Item Status

Date Initiated: 11-15-2017

Technical Contact: Daniel Norden

Item: 000