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Hydraulic Properties in a Silt Loam Soil under Natural Prairie, Conventional Till, and No-Till

Dep. of Crop and Soil Sciences, Center for Multiphase Environmental Research, Washington State Univ., Pullman, WA 99164

View larger version (36K): [in a new window]   Fig. 1. Temporal variation of hydraulic conductivity for sampling depths 0 to 5 cm (left panels) and 5 to 10 cm (right panels). Symbols represent the geometric mean and the bars are 95% confidence intervals (n = 8).

View larger version (26K): [in a new window]   Fig. 2. Monthly precipitation and temporal variation of bulk density for sampling depths 0 to 3, 3 to 6, and 6 to 9 cm. Symbols represent the mean and the bars are one standard error (n = 5). Precipitation data courtesy of Pullman NOAA Weather Station, WA (Jeff Smith, USDA-ARS, Pullman, WA, personal communication, 2003).

View larger version (41K): [in a new window]   Fig. 3. Measured soil moisture characteristic (symbols) and fitted van Genuchten relationships (lines) for different sampling times and depths.

View larger version (58K): [in a new window]   Fig. 4. Variation in time and depth in the distribution of pore sizes (expressed as percentage of total porosity f), determined from the soil moisture characteristic.

View larger version (29K): [in a new window]   Fig. 5. Hydraulic conductivity averaged over all sampling periods for sampling depths (a) 0 to 5 cm and (b) 5 to 10 cm. Symbols represent the geometric mean and the bars are 95% confidence intervals (n = 48). Inserts show data on a semi-logarithmic plot, with the same units of the axes as the linear-linear plots.