Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Golden, Bobby R.
Committee Member
Irby, Trent
Committee Member
Bond, Jason A.
Committee Member
Gore, Jeff
Date of Degree
12-8-2017
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
Rice (Oryza sativa L.) that is grown in the U.S. is predominantly grown in the mid-south. Current Mississippi State University recommendations for nitrogen (N) fertilization of rice suggest a single application of 168 kg N ha-1 on soils with CEC ¡Ü 20 and 202 kg N ha-1 on soils with CEC > 20. The primary objective was to identify alternative N management strategies that may potentially be used to reduce costs associated with aerial application of N fertilizer to rice. Research was established at the Delta Research and Extension Center, at Stoneville, MS, on two soil textures during 2015 and 2016. The combination of application timings and N sources resulted in a total of eight N management strategies. Data from all siteyears were pooled together for analysis to evaluate differences among N management strategy. Urea + [N-(n-butyl)thiophosphoric triamide] (NBPT) applied in a single application 7 days before flood (DBF), two-way split application, and PCU-2 LF produced statistically similar and greatest mean rice grain yield. These data suggests that N fertilizer can be applied early (2 to 3 leaf growth stage) from a ground based fertilizer spreader prior to the levee construction. Single optimum and two-way split N management strategies produced more total dry matter (TDM) at heading (HDG) and more N uptake at HDG. Urea + NBPT applied in a single application 7 DBF should be the N management strategy of choice in mid-southern U.S. rice production.
URI
https://hdl.handle.net/11668/19696
Recommended Citation
Turner, Richard Edward, "Alternative Post Emergence Nitrogen Management Strategies for Delayed-Flood Rice Production" (2017). Theses and Dissertations. 441.
https://scholarsjunction.msstate.edu/td/441