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Measuring the Unsaturated Hydraulic Conductivity of Growing Media with a Tension Disc

^a Département des Sols et Génie agroalimentaire, Centre de Recherche en Horticulture, Université Laval, Sainte-Foy, Québec Canada, G1K 7P4
^b Land Resource Science Department, University of Guelph, Guelph, Ontario, Canada N1G 2W1

View larger version (17K): [in a new window]   Fig. 1. Schematic view of the experimental set up used to measure the unsaturated hydraulic conductivity under transient flow with a CS-615 and tensiometers.

View larger version (36K): [in a new window]   Fig. 2. Schematic view of the experimental apparatus used to measure the unsaturated hydraulic conductivity under steady-state flow with a tension disc. The glass bead height is not to scale, and is shown thicker for representation purposes only. A Mariotte bottle (not shown) is used to maintain a constant water level within the box.

View larger version (17K): [in a new window]   Fig. 3. The simple tension disc. The bottom surface is covered with nylon cloth (15-µm pore size), which is glued along the disc periphery. The bottom surface is made of acrylic through which large holes are made.

View larger version (26K): [in a new window]   Fig. 4. Unsaturated hydraulic conductivity curves for the two substrates. The curve parameters are in Table 2.

View larger version (17K): [in a new window]   Fig. A1. Hydraulic conductivity values calculated with the single exponential approach and the piecewise exponential approach (PEA) procedures from the theoretically generated Jw values, themselves using the theoretical K()– values.