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Pipeline installations have been reported to cause soil compaction. Recently, an energy transfer pipeline was installed across the upper Midwest of the United State that affected agricultural land throughout the state of Iowa. Long-term research is needed to determine the best management practices to remediate subsoil compaction, and restore topsoil productivity to allow for maximum crop yield recovery. A five-year research study has been undergoing to evaluate the response of crop productivity and soil physical properties to subsoiling treatments in the construction Right-ofWay [ROW] on a farm field at Iowa State University. The specific objectives for this study are to: (i) investigate the effects of subsoiling depths as remediation practices of soil bulk density and crop yield, and (ii) determine if the crop yield is affected by soil disturbance from pipeline installation. The experiment was set up in a Randomized Complete Block Design to investigate the subsoiling depths in three ROW zones designated by construction activities, and two adjacent unaffected zones. Soil bulk density samples were taken to quantify the soil compaction that occurred after heavy trafficking and pipeline installation, and proceeding subsoiling treatment. Crop yields (corn and soybean) were monitored in the subsequent years. Observed soil bulk density and crop yield values were statistically analyzed (P-value 0.05) with SAS statistical software to evaluate the effects of subsoiling treatments. The soil bulk densities were found to be the highest in the ROW, indicating subsoil compaction from construction activities. The highest soil bulk density value (1.74 g/cm) was found in the most heavily trafficked zone post-pipeline installation. Soil bulk density in the lightly trafficked zone had the highest soil bulk density value (1.74 g/cm) after subsoil

Evaluation of deep tillage remediation in a construction easement on soil compaction and crop yield