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5264. Pikul, J.L. Jr., R.R. Allmaras and C.R. Rohde. 1983. Water movement through tillage pans after 52 years of crop residue management.. OR Agr. Expt. Sta. Special Report 680, p.8-13.
The objective of this study was to measure and compare the saturated hydraulic conductivity in and below the tillage pan produced in plots which have received different treatments of crop residue management. Soil hydraulic conductivity was 35% lower on plots which had been fall burned as compared to plots into which strawy manure plus straw was incorporated. These results are consistent with the measured declines in soil organic matter and the development of denser tillage pans. Once a tillage pan is created (no matter how slight) mechanical compaction, water flow, and soil chemical changes (silica migration) may interact to form a nucleus for subsequent accelerated pan formation. T: Bulk density of soil where the straw residue was burned in the fall or straw plus 10,800 kg/ha strawy manure was plowed under in the spring. Saturated hydraulic conductivity and percent organic matter change since 1931.