Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Reynolds, Daniel B.

Committee Member

Dodds, Darrin M.

Committee Member

Irby, J. Trenton

Committee Member

Cox, Michael S.

Date of Degree

5-17-2014

Original embargo terms

MSU Only Indefinitely

Document Type

Graduate Thesis - Campus Access Only

Major

Weed Science

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

New low volatile formulations of dicamba and 2,4-D are being developed to reduce injury to non-tolerant crops. Experiments were conducted comparing dicamba and 2,4-D volatility as affected by formulation, soil moisture content and soil texture. All formulations were applied to soil contained in greenhouse flats. After application greenhouse flats were then placed between a bio-indicator row of cotton and soybean. An open ended plastic dome covered the treated flats and crops for 48 hours prior to removal. Plant heights and yield of bio-indicator crops were unaffected by 2,4-D and dicamba volatility. Soil texture and moisture content did not significantly affect volatility. The greatest soybean crop injury was observed following application of the dimethylamine salt of dicamba and cotton injury was greatest following application of the ethylhexylester salt of 2,4-D. Volatility was generally reduced with new formulations of dicamba or 2,4-D; however, volatility was not completely eliminated.

URI

https://hdl.handle.net/11668/17818

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