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Determining Air Entry Value in Peat Substrates

^a Université du Québec, INRS-Eau, 2800 rue Einstein, C.P. 7500, Ste-Foy, QC, Canada, G1V 4C7
^b Département des Sols et de Génie Agroalimentaire, FSAA, Université Laval. Québec, QC, Canada, G1K 7P4
^c Université du Québec, INRS-Eau, 2800 rue Einstein, C.P. 7500, Sainte-Foy, QC, Canada, G1V 4C7

View larger version (18K): [in a new window]   Fig. 1. A schematic diagram of the tension table used in the determination of air entry value.

View larger version (40K): [in a new window]   Fig. 2. A schematic diagram of the tension chamber apparatus used in the determination of air entry value. Two wing bolts are hidden in the figure.

View larger version (21K): [in a new window]   Fig. 3. Determination of air entry values using the tension table method for four different peat mixes in one replicate. The dotted line represents the air entry value.

View larger version (22K): [in a new window]   Fig. 4. Example of the evolution of the potential in the tension chamber apparatus for the peat substrate treatment using the tensiometer located on the upper plate (upper tensiometer, both corrected and uncorrected), and the tensiometer located at the bottom of the cylinder (lower tensiometer) showing five drainage response curve. The data from the upper tensiometer was corrected by adding a positive pressure value corresponding to the suction associated with the column height to eliminate the effect because of this hanging water column on the upper tensiometer reading.

View larger version (21K): [in a new window]   Fig. 5. Determination of air entry values using the tension chamber apparatus for four different peat mixes in one replicate.

View larger version (15K): [in a new window]   Fig. 6. Relationship between air entry values obtained from the two different methods. ***, significant at P 0.001.