Theses and Dissertations

Advisor

Reed, Vaughn

Committee Member

Bumguardner, Amee

Committee Member

Dhillon, Jagmandeep

Committee Member

Zurweller, Brendan

Date of Degree

5-15-2026

Original embargo terms

Immediate Worldwide Access

Document Type

Graduate Thesis - Open Access

Major

Plant & Soil Sciences (Agronomy)

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Application timing of nitrogen (N) fertilizer within the corn growing season can be crucial to crop nutrient uptake and availability. A lack of region-specific timing recommendations may result in inefficient fertilizer use and inconsistent yield responses. The objectives of this study were to determine how late in the growing season a first and second N fertilizer application can be pushed until corn yield is impacted and investigate whether Growing Degree Days (GDDs) should be used as better estimate of timing for N application than calendar date or growth stage. First applications were able to be delayed until V4-V6 growth stages as long as a second application was made at V10. Second applications were pushed until V12-R1 without yield loss if a pre-plant application was made. GDD analysis confirmed that GDDs can be used to determine growth stage.

Sponsorship (Optional)

Mississippi Corn Promotion Board

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