Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Ferguson, Jason Connor
Committee Member
Reynolds, Daniel B.
Committee Member
Kruger, Greg R.
Committee Member
Irby, Jon Trenton
Date of Degree
12-14-2018
Original embargo terms
Worldwide
Document Type
Graduate Thesis - Open Access
Major
Plant and Soil Sciences (Weed Science)
Degree Name
Master of Science
College
College of Agriculture and Life Sciences
Department
Department of Plant and Soil Sciences
Abstract
Field studies conducted in Missouri and Mississippi, in 2017 and 2018, respectively, indicated no droplet size effect on PRE herbicide efficacy, regardless of the herbicide, weed, soil, crop residue and weather conditions during spraying. Nozzle type enhanced herbicide efficacy for one location and herbicide. The TTI60 dual fan nozzle increased pendimethalin weed control, up to 91%, in a high organic matter (OM) soil with large clods and substantial weed pressure. Pendimethalin efficacy was reduced under high OM soils (> 2%) while metribuzin efficacy was reduced under low OM (< 0.7%), low cation exchange capacity (<13.1%) soils and 12.2 mm of rain three days after application. The greenhouse studies indicated that increasing crop residue levels reduced velvetleaf control by 7%. Simulated rainfall eight days after herbicide application decreased johnsongrass dry weight reductions by 29% in comparison to two day rainfall.
URI
https://hdl.handle.net/11668/18739
Recommended Citation
Urach Ferreira, Pedro Henrique, "Effect of the Spray Droplet Size and Herbicide Physiochemical Properties on Pre-Emergence Herbicide Efficacy for Weed Control in Soybeans" (2018). Theses and Dissertations. 1691.
https://scholarsjunction.msstate.edu/td/1691