Theses and Dissertations

ORCID

https://orcid.org/0000-0002-2149-9969

Issuing Body

Mississippi State University

Advisor

Tseng, Te-Ming Paul

Committee Member

Avila, Luis

Committee Member

Shankar, Ganapathi Shanmugam

Committee Member

Rai, Aswathy

Date of Degree

12-13-2024

Original embargo terms

Visible MSU only 1 year

Document Type

Graduate Thesis - Campus Access Only

Major

Plant and Soil Sciences (Weed science)

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Reducing herbicide carryover in soybean production is imperative to sustain future soybean cropping systems in Mississippi and the rest of the world. This research was conducted to determine the response of inoculated soybean to corn (Zea mays L.) residual herbicides. The herbicide treatments included aatrex (atrazine), callisto (mesotrione), lexar (atrazine+mesotrione+s-metolachlor), and steadfast (nicosulfuron+rimsulfuron) at 100%, 75%, 50%, and 25% of the total label rate. Inoculant treatments were Bradyrhizobium japonicum, Bacillus subtilis, and no inoculant. Bacterial inoculants positively impacted most shoot and root growth parameters, significantly increasing depending on the herbicide x inoculant treatment combination and its rate. B.japonicum alone and in combination with B.subtilis can be potentially used in soybean production to alleviate corn residual herbicide carryover effects. However, due to the complex interaction between soybean, rhizobia, and herbicides, further long-term evaluations are needed to develop a more robust technology and make recommendations for use by farmers.

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