Predicting Physical and Chemical Properties of Container Mixtures

in HortScience
Authors:
J. R. JenkinsSoil and Environmental Sciences, University of California, Riverside, CA 92521

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W. M. JarrellEnvironmental Sciences and Engineering, Oregon Graduate Center, Beaverton, OR 97006-1999

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Abstract

This paper describes a system for predicting container mixture physical and chemical properties from component properties. An additive model is presented that assumes that a mixture property is the weighted sum of the properties contributed by the individual components. To test this hypothesis, 24 combinations of sandy loam soil (Typic Xerothent), sand (Typic Xeropsamment), bark, and perlite were tested for bulk density, total and air-filled porosities, container capacity, available water, saturated hydraulic conductivity, pH, and cation exchange capacity. The measured experimental data were compared with values predicted from the additive model. Measured and predicted values were in good agreement for most properties, except saturated hydraulic conductivity and air-filled porosity for mixtures with low total porosity. Application of the same approach also worked well for previously published data.

Contributor Notes

Received for publication 21 Mar. 1988. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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