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Impacts of Long-Term Wheat Straw Management on Soil Hydraulic Properties under No-Tillage

Carbon Management and Sequestration Center, FAES/OARDC, School of Environment and Natural Resources, Ohio State Univ., 2021 Coffey Rd., Columbus, Ohio 43210-1085

View larger version (17K): [in this window] [in a new window]   Fig. 1. Geometric means of (A) saturated hydraulic conductivity by depth and (B) unsaturated hydraulic conductivity for the 0- to 3-cm depth under an uncropped no-till system managed with three levels (0, 8, and 16 Mg ha–1yr–1) of wheat straw for 10 yr on a Crosby silt loam. The water-content-dependent hydraulic conductivity, K(), did not differ between 8 and 16 Mg ha–1yr–1, but both mulched treatments differed significantly (P < 0.05) from the unmulched (0 Mg ha–1yr–1) treatment.

View larger version (19K): [in this window] [in a new window]   Fig. 2. Mean (A) water infiltration rates and (B) antecedent volumetric water content for 10 yr on a Crosby silt loam under an uncropped no-till system managed with three levels (0, 8, and 6 Mg ha–1yr–1) of wheat straw. Error bars represent the standard deviation of the mean of infiltration rates for each time of measurement.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Soil water characteristic curves for three depth intervals under an uncropped no-till system managed with three levels (0, 8, and 6 Mg ha–1yr–1) of wheat straw for 10 yr on a Crosby silt loam. Error bars represent the LSD values to compare differences in treatment effects at each pressure head.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Soil bulk density with depth under an uncropped no-till system managed with three levels (0, 8, and 16 Mg ha–1yr–1) of wheat straw for 10 yr on a Crosby silt loam.

View larger version (21K): [in this window] [in a new window]   Fig. 5. Pore-size distribution expressed as fraction of pore volume per pore diameter within two soil depth intervals under an uncropped no-till system managed with three levels (0, 8, and 6 Mg ha–1yr–1) of wheat straw for 10 yr on a Crosby silt loam. Error bars represent the LSD values to compare differences in treatment effects within each pore-size interval.

View larger version (14K): [in this window] [in a new window]   Fig. 6. Log-transformed saturated hydraulic conductivity (Ksat) as a function of effective porosity as affected by 10 yr of straw management on a Crosby silt loam.