Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/3/2009
Publication Date: 6/1/2009
Citation: Webster, T.M., Timper, P., Sosnoskie, L.M. 2009. Long-term tillage system in a cotton-peanut rotation. Proceedings of Southern Weed Science Society. 62:318. Interpretive Summary:
Technical Abstract: Previous long-term tillage studies have evaluated shifts in weed species composition, with only limited research in cotton-peanut rotations. A study was established in 2000 (continuing through 2008) in an area with a 15-year history of reduced tillage. Treatments included conventional tillage (CT, moldboard plow followed by two diskings), strip tillage (ST, in-row subsoiler that disturbs a 21-cm band, leaving 71 cm undisturbed between crop rows), and no-tillage (NT, undisturbed prior to tillage). Tillage systems were in a cotton-peanut rotation, with each crop and tillage combination occurring each year. In the spring of the year following tillage treatments, but prior to crop planting, the soil seedbank was sampled in each treatment to quantify potential weed populations. Emerged weed populations in the field plots were scouted at appropriate times in each crop and tillage treatment. Herbicide control recommendations were generated using HADSS-Georgia (a decision support system developed at North Carolina State University, with a weed efficacy database tailored to Georgia). There were differences in cotton yield among tillage systems, with CT and ST having equivalent yields that were higher than NT. There were no differences in peanut yields among tillage systems. CT systems had fewer summer annual weeds than NT and ST systems. Greater broadleaf weed populations occurred in NT than the other systems. Summer annual and broadleaf weeds were higher following peanut than following cotton.