Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Varco, Jac J.

Committee Member

Henry, W. Brien

Committee Member

Golden, Bobby R.

Committee Member

Paz, Joel O.

Date of Degree

1-1-2016

Document Type

Graduate Thesis - Open Access

Major

Agronomy

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Urea based fertilizers are susceptible to N losses through volatilization, denitrification, and leaching. A field and incubation experiment were conducted at Mississippi State between 2013 and 2015 to evaluate the effect of fertilizer stabilizers on grain yield, N use, and N transformations in various soil textures. Stabilizers were applied to liquid urea-ammonium-nitrate (UAN) solution (32%) and granular urea (46-0-0) at labeled rates for 179 and 112 kg N ha-1 for the field and incubation experiments, respectively. Grain yield and N content at tasseling and physiological maturity were measured for the field experiment. Extracts from the incubation experiment were measured for NH4+-N and NO3⁻-N concentrations. Results from the field experiment suggest greater plant N accumulation, but inconsistent yield increases with fertilizer stabilizers. Incubation results indicate fertilizer stabilizers significantly decrease the rate of N transformations. Further research is necessary to determine the effects of stabilizers over N rates and yearly environmental conditions.

URI

https://hdl.handle.net/11668/19499

Comments

urea||stabilizers||nitrogen

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