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DIVISION S-1-SOIL PHYSICS

Stability of Structural Form during Infiltration

Laboratory Measurements on the Effect of De-inking Sludge

Dép. des Sols et de Génie Agroalimentaire, FSAA, Université Laval, QC, Canada G1K 7P4

nematimr{at}inrs-eau.uquebec.ca

An adequate understanding of the mechanisms involved in the structural stabilization of soil by different sources of organic matter is needed to help design management strategies aimed at maintaining a stable soil structure. The objective of this study was to identify mechanisms involved in soil structure stabilization by paper sludge application, either by increasing the soil resistance to external stresses (aggregate stability) or by decreasing the magnitude of the external stresses (diminution of the wetting rate). A laboratory study was conducted on three different soil types with application of paper sludge at three rates (8, 16, and 24 dry t ha^-1). The mean weight diameter, bulk density, hydraulic conductivity, and water retention properties were measured before and after a wetting event. The results indicate that most of the changes in physical properties resulting from rapid wetting took place at the soil surface (0–50 mm) and the magnitude of these changes gradually decreased down to a depth of 150 mm. Paper sludge application significantly improved the stability of 1- to 4-mm aggregates to the destructive action of wetting in all three soil types. Paper sludge application increased porosity at potential > -2 kPa, which resulted in higher hydraulic conductivity values (up to 88%) and a smaller increase in soil bulk density (down to 67%) relative to a control following rapid wetting. The wetting rates observed during the wetting event were similar regardless of the treatment, because the increase in the water potential at the wetting front was compensated for by an increase in hydraulic conductivity with increasing rates of sludge application.

Abbreviations: DWR, difference between water retention values before and after wetting event • MWD, mean weight diameter • TDR, time domain reflectometry

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