Topsoil Loss Does Not Necessarily Equal Lost Crop Yield Potential: Evaluating Agronomic Characteristics of Surface Soils On a Pipeline Right-of-Way.

Lack of adequate topsoil depth and perception of lost soil fertility on pipeline construction rights-of-way are major concerns for landowners and can become extensive post-construction costs for pipeline companies.  Reduction in crop productivity can occur in agricultural fields after pipeline construction due to numerous factors including compaction, drainage, and changes in surface soil characteristics. 

Significant changes in soil texture and/or organic matter content can change cation exchange capacity (CEC) and water holding capacity of the soil.  Reduced CEC, as well as low soil fertility levels, can reduce the crops ability to withstand environmental stress, therefore reducing crop yield.  

Topsoil stockpiled and replaced on the construction right-of-way (ROW) of a 42 inch natural gas pipeline through Kansas and Missouri was evaluated and compared to the topsoil adjacent to the ROW.  Soils were evaluated on and off the ROW to compare topsoil depths, soil fertility, texture and other agronomic factors. 

Varying amounts of topsoil loss was found at a majority of sample sites.  Differences between the on-ROW and off-ROW values for the other soil parameters tested were not significant.  The lack of significant change in tested parameters on-ROW, compared to the undisturbed topsoil off-ROW indicates no loss of crop yield potential would be expected due to the reduction in topsoil depth. 

Keywords: [crop productivity, soil fertility, topsoil, topsoil depth, topsoil removal, topsoil replacement, yield, yield loss].