Author(s)

Jonathan W. Fox¹, Ahmad Khalilian^1*, Young J. Han¹, Phillip B. Williams¹, Ali Mirzakhani Nafchi¹, Joe Mari Maja², Michael W. Marshall², Edward M. Barnes³

¹Department of Agricultural Sciences, Clemson University, Clemson, SC, USA.
²Edisto Research and Education Center, Clemson University, Blackville, SC, USA.
³Cotton Incorporated, Cary, NC, USA.

Cotton root growth is often hindered in the Southeastern U.S. due to the presence of root-restricting soil layers. Tillage must be used to temporarily remove this compacted soil layer to allow root growth to depths needed to sustain plants during periods of drought. However, the use of a uniform depth of tillage may be an inefficient use of energy due to the varying depth of this root-restricting layer. Therefore, the objective of this project was to develop and test equipment for controlling tillage depth “on-the-go” to match the soil physical parameters, and to determine the effects of site-specific tillage on soil physical properties, energy requirements, and plant responses in cotton production. Site-specific tillage operations reduced fuel consumption by 45% compared to conventional constant-depth tillage. Only 20% of the test field required tillage at recommended depth of 38-cm deep for Coastal Plain soils. Cotton taproot length in the variable-depth tillage plots was 96% longer than those in the no-till plots (39 vs. 19.8 cm). Statistically, there was no difference in cotton lint yield between conventional and the variable-depth tillage. Deep tillage (conventional or variable-rate) increased cotton lint yields by 20% compared to no-till.

Variable-Rate Tillage, Cotton, Soil Compaction, Precision Agriculture, Energy

Fox, J. , Khalilian, A. , Han, Y. , Williams, P. , Nafchi, A. , Maja, J. , Marshall, M. and Barnes, E. (2018) Real-Time, Variable-Depth Tillage for Managing Soil Compaction in Cotton Production. Open Journal of Soil Science, 8, 147-161. doi: 10.4236/ojss.2018.86012.