Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Rangappa, Raju Bheemanahalli

Committee Member

Guihong, Bi

Committee Member

Bryant, Corey

Committee Member

Reddy, K. Raja

Committee Member

Jha, Prakash

Date of Degree

8-7-2025

Original embargo terms

Visible MSU Only 1 year

Document Type

Graduate Thesis - Campus Access Only

Major

Agronomy

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Drought and heat stresses during vegetative and reproductive stages cause yield losses up to 50% in soybeans. Biostimulants have potential to improve stress tolerance and enhance crop resilience, but selecting an effective product remains challenging due to the wide range of commercial options. This study aimed to identify suitable biostimulants that alleviate drought and heat stress during vegetative and reproductive stages. There was 64% and 76% reduction in stomatal conductance under vegetative and reproductive stage drought stress, respectively. Drought and heat stress during reproductive stages resulted in 44% and 36% reduction in total seed weight, respectively. Among biostimulants, treated check (T2) and Trevo (T14) increased total seed weight by 32% under drought stress and the combination of BioWake and Biofriendly increased total seed weight by 11% under heat stress compared to untreated check (T1). Biostimulants showed non-significant effects on soybeans across growth stages in soybeans under drought and heat stress.

Sponsorship (Optional)

Mississippi Soybean Promotion Board (MSPB)

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