Date of Award
9-22-2025
Document Type
Thesis
Degree Name
Agriculture, MSA
First Advisor
Steven Green
Second Advisor
Arlene Adviento-Borbe
Committee Members
Deepak Joshi
Abstract
Rice cultivation offers many opportunities including secure food supply, support livelihoods and mitigate greenhouse gas emissions (GHG), particularly methane (CH4) and nitrous oxide (N2O). This study evaluated the impact of irrigation method and nitrogen (N) fertilizer type on GHG emissions and yield in drill-seeded rice from 2022 to 2024. A field study was conducted to compare the impacts of flooded and furrow irrigation with either Urea or sulfur-enriched urea (Urea-S) at 168 kg N ha⁻¹ on rice yield, N use efficiency and GHG emissions. Gas samples were collected using flux vented chamber method and analyzed via gas chromatography. Furrow irrigation reduced CH₄ emissions by 90-100% but increased N₂O emissions by up to 86% across N fertilizer types. Urea-S reduced N₂O emissions under certain moisture conditions and improved N recovery in flooded plots by 67%. Grain yields were >10 Mg ha⁻¹ across all treatments and were unaffected by irrigation and N fertilizer types. Results highlight the relevance of aligning irrigation strategy with N fertilizer type to optimize N use and reduce N2O emissions.
Rights Management
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Recommended Citation
Larazo, Nikki Arivel, "Achieving Low Greenhouse Gas Emissions in Non-Flooded Rice Through Effective Nitrogen Fertilizer Management" (2025). Student Theses and Dissertations. 1104.
https://arch.astate.edu/all-etd/1104
