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An Automated Vacuum Extraction Control System for Soil Water Percolation Samplers

USDA, ARS, Northwest Irrigation and Soils Research Laboratory, 3793 N 3600 E, Kimberly, ID 83341

View larger version (27K): [in a new window]   Fig. 1. Schematic diagram of a portion of the percolation monitoring system, including samplers, collection flasks, and the extraction vacuum controller installed at each of 12 sampling sites, and connections to the data logger and main vacuum supply.

View larger version (40K): [in a new window]   Fig. 2. Laboratory setup for testing percolation samplers, and determining the effect sampler extraction tension and in situ soil tension on percolation volume.

View larger version (71K): [in a new window]   Fig. 3. Field installation and placement of soil water percolation samplers.

View larger version (26K): [in a new window]   Fig. 4. Electrical circuit diagram for automated vacuum extraction controller. Components with identifier codes are further defined in Table 2.

View larger version (21K): [in a new window]   Fig. 5. Sampler extraction pressure and 1.2-m soil moisture tension from one sampling site, recorded over a 2-wk period beginning at furrow irrigation.