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Soil Quality and Water Intake in Traditional-Till vs. No-Till Paired Farms in Washington's Palouse Region

^a USDA-ARS, 217 Johnson Hall, Washington State Univ., Pullman, WA 99164-6421
^b Dep. of Crop and Soil Sciences, Washington State Univ., Dryland Res. Stn., Lind, WA 99341

View larger version (34K): [in a new window]   Fig. 1. Soil organic C in traditional till (TT) vs. no-till (NT) soil at (A) the 0- to 5-cm and (B) 5- to 10-cm soil depths at three slope positions. Data are means across sites and years.

View larger version (21K): [in a new window]   Fig. 2. Principal component analysis (PCA) of whole-soil FAME for traditional till (TT) and no-till (NT) soils at summit-, side-, and toe-slope positions. Data are means across sites and years. Numbers below symbols indicate the site where the soil sample was obtained.

View larger version (48K): [in a new window]   Fig. 3. Soil water distribution in the 180-cm profile with traditional-till (TT) and no-till (NT) just after wheat harvest in September (left pair of data lines) and again in early April (right pair of data lines) at three slope positions at three paired farm sites. Data are the average for 2 yr. Numerical values are the 2-yr average net gain in over-winter soil water for TT vs. NT at each slope position. Figures A, B, and C are the three slope positions for summit, side and toe for Site 1. Figures D, E, and F are the three slope positions for summit, side and toe for Site 2. Figures G, H, and I are the three slope positions for summit, side and toe for Site 3.

View larger version (34K): [in a new window]   Fig. 4. Ponded water infiltration into traditional-till (TT) and no-till (NT) soil at three slope positions at three paired farm sites in September 2001. Measurements were obtained in standing and undisturbed wheat stubble. The quantity of water that had infiltrated into the soil was recorded at 10-min intervals during each 120-min run. Figures A, B, and C are the three slope positions for summit, side and toe for Site 1. Figures D, E, and F are the three slope positions for summit, side and toe for Site 2. Figures G, H, and I are the three slope positions for summit, side and toe for Site 3.