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.
| Identifer | oai:union.ndltd.org:MSSTATE/oai:scholarsjunction.msstate.edu:td-1440 |
| Date | 08 December 2017 |
| Creators | Turner, Richard Edward |
| Publisher | Scholars Junction |
| Source Sets | Mississippi State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Theses and Dissertations |
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