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Neutron Probe Calibration in a Vertically Stratified Vadose Zone

^a Soil Water and Environmental Science Dep., Univ. of Arizona, Tucson, AZ 85721
^b Hydrology and Water Resources Dep., Univ. of Arizona, Tucson, AZ 85721

View larger version (10K): [in a new window]   Fig. 1. Monitoring Locations 1 through 9 for Exp. 1 and 2.

View larger version (42K): [in a new window]   Fig. 2. Neutron probe count ratio profile at Monitoring Location 6, 6 d before Exp. 1. The dashed lines represent the texture boundaries by count ratio (CR): for sand, CR < 1.1; for loamy sand, CR 1.1–1.25; for sandy loam, CR > 1.25.

View larger version (60K): [in a new window]   Fig. 3. Soil texture, neutron probe count ratio (CR), and water content (WC) data at nine monitoring locations. There were no samples below 2 m for Sites 8 and 9. Samples were taken after 3 yr of redistribution, before the first irrigation experiment. (Samples taken every 25 cm except at the 225-cm depth.)

View larger version (21K): [in a new window]   Fig. 4. Water content vs. count ratio at the nine monitoring locations for the upper 2.5 m of soils. Triangles are sand, squares are loamy sand, and diamonds are sandy loam. The dashed line was fitted through all data. The calibration lines obtained by Young et al. (1999) and Thomasson (2001) are also shown.

View larger version (20K): [in a new window]   Fig. 5. Water content vs. count ratio for sandy loam, loamy sand, sand, and their corresponding least squares fitted straight lines.

View larger version (34K): [in a new window]   Fig. 6. Total water measured in the soil for the top 10 m using one layer (triangle), two-layer (cross), three-layer (square), and three-layer plus interface (circle) calibrations vs. the cumulative applied water (bold line) at all nine monitoring locations during Exp. 2. Between Days 6 and 20, mean RMSE values for the soil measured, using one-layer, two-layer, three-layer, and three-layer plus interface calibration equations, vs. surface applied water are 0.095, 0.067, 0.071, and 0.039 m water, respectively.