(European Committee for Standardization, CEN methods) and the Rural Development Administration (RDA methods) Methods for Determining Physical Properties of Horticultural Substrates

National Instrumentation Center for Environmental Management, Seoul, 151-921, KoreaThis study was carried out to compare physical properties of the horticultural substrates measured by theEuropean standard methods (CEN methods) and the Rural Development Administration of Koreamethods (RDA methods). Sixty horticultural substrates including 40 marketed substrates and 10 organicand inorganic raw materials such as peat moss, coir dust, rice hull, perlite and zeolite were sampled. Thesamples were then analyzed for 6 physical properties by both CEN methods and RDA methods. The resultsof both methods were analyzed by linear regression. Bulk density (R