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1 Sander, B. O.; Wassmann, R.; Siopongco, J. D. L. C. 2015. Mitigating greenhouse gas emissions from rice production through water-saving techniques: potential, adoption and empirical evidence. In Hoanh, Chu Thai; Johnston, Robyn; Smakhtin, Vladimir. Climate change and agricultural water management in developing countries. Wallingford, UK: CABI. pp.193-207. (CABI Climate Change Series 8)

Greenhouse gases ; Methane emission ; Nitrous oxide ; Crop production ; Flood irrigation ; Rice ; Water conservation ; Water management ; Farmers ; Wet season ; Dry season

(Location: IWMI HQ Call no: IWMI Record No: H047379)

http://www.iwmi.cgiar.org/Publications/CABI_Publications/climate-change-series/chapter-12.pdf

(599 KB)

2 Islam, S. M. M.; Gaihre, Y. K.; Islam, Md. R.; Ahmed, Md. N.; Akter, M.; Singh, U.; Sander, B. O.. 2022. Mitigating greenhouse gas emissions from irrigated rice cultivation through improved fertilizer and water management. Journal of Environmental Management, 307:114520. (Online first) [doi: https://doi.org/10.1016/j.jenvman.2022.114520]

Irrigated rice ; Greenhouse gas emissions ; Emission reduction ; Irrigated farming ; Water management ; Global warming ; Fertilizers ; Nitrous oxide ; Methane emission ; Urea ; Use efficiency ; Crop management ; Integrated plant nutrient management / Bangladesh / Gazipur

(Location: IWMI HQ Call no: e-copy only Record No: H050888)

https://www.sciencedirect.com/science/article/pii/S0301479722000937/pdfft?md5=0eaa9b512d6b0a05efd7497c1b19b265&pid=1-s2.0-S0301479722000937-main.pdf
https://vlibrary.iwmi.org/pdf/H050888.pdf

(0.91 MB) (928 KB)

Greenhouse gas (GHG) emissions from agriculture sector play an important role for global warming and climate change. Thus, it is necessary to find out GHG emissions mitigation strategies from rice cultivation. The efficient management of nitrogen fertilizer using urea deep placement (UDP) and the use of the water-saving alternate wetting and drying (AWD) irrigation could mitigate greenhouse gas (GHG) emissions and reduce environmental pollution. However, there is a dearth of studies on the impacts of UDP and the integrated plant nutrient system (IPNS) which combines poultry manure and prilled urea (PU) with different irrigation regimes on GHG emissions, nitrogen use efficiency (NUE) and rice yields. We conducted field experiments during the dry seasons of 2018, 2019, and 2020 to compare the effects of four fertilizer treatments including control (no N), PU, UDP, and IPNS in combination with two irrigation systems— (AWD and continuous flooding, CF) on GHG emissions, NUE and rice yield. Fertilizer treatments had significant (p < 0.05) interaction effects with irrigation regimes on methane (CH4) and nitrous oxide (N2O) emissions. PU reduced CH4 and N2O emissions by 6% and 20% compared to IPNS treatment, respectively under AWD irrigation, but produced similar emissions under CF irrigation. Similarly, UDP reduced cumulative CH4 emissions by 9% and 15% under AWD irrigation, and 9% and 11% under CF condition compared to PU and IPNS treatments, respectively. Across the year and fertilizer treatments, AWD irrigation significantly (p < 0.05) reduced cumulative CH4 emissions and GHG intensity by 28%, and 26%, respectively without significant yield loss compared to CF condition. Although AWD irrigation increased cumulative N2O emissions by 73%, it reduced the total global warming potential by 27% compared to CF irrigation. The CH4 emission factor for AWD was lower (1.67 kg ha-1 day-1) compared to CF (2.33 kg ha-1 day-1). Across the irrigation regimes, UDP increased rice yield by 21% and N recovery efficiency by 58% compared to PU. These results suggest that both UDP and AWD irrigation might be considered as a carbon-friendly technology.

3 Zhang, Z.; Macedo, I.; Linquist, B. A.; Sander, B. O.; Pittelkow, C. M. 2024. Opportunities for mitigating net system greenhouse gas emissions in Southeast Asian rice production: a systematic review. Agriculture, Ecosystems and Environment, 361:108812. (Online first) [doi: https://doi.org/10.1016/j.agee.2023.108812]

(Location: IWMI HQ Call no: e-copy only Record No: H052391)

https://www.sciencedirect.com/science/article/pii/S0167880923004711/pdfft?md5=f6cf432eca45807ac8395f42cb54e212&pid=1-s2.0-S0167880923004711-main.pdf
https://vlibrary.iwmi.org/pdf/H052391.pdf

(2.27 MB) (2.27 MB)

Southeast Asia (SEA) is a key producer and exporter of rice, accounting for around 28% of rice produced globally. To effectively mitigate greenhouse gas (GHG) emissions in SEA rice systems, field methane (CH4) and nitrous oxide (N2O) emissions have been intensively studied. However, an integrated assessment of system-level GHG emissions which includes other carbon (C) balance components, such as soil organic carbon (SOC) or energy use, that can positively or negatively influence the net capacity for climate change mitigation is lacking. We conducted a systematic review of published research in SEA rice systems to synthesize findings across four main components of net system emissions: (1) field GHG emissions, (2) energy inputs, (3) residue utilization beyond the field, and (4) SOC change. The objectives were to highlight effective mitigation opportunities and explore cross-component effects to identify tradeoffs and key knowledge gaps. Field GHG emissions were the largest contributor to net system emissions in agreement with existing scientific consensus, with results showing that practices such as floodwater drainage and residue removal are sound options for CH4 mitigation. On the other hand, increasing SOC potentially provides a large GHG mitigation opportunity, with long-term continuous rice cropping and practices such as residue incorporation and biochar application promoting SOC increase. A reduction in energy inputs was mainly achieved by optimizing agrochemical use, especially N fertilizers. For residue utilization beyond the field, GHG emission mitigation mainly came from preventing open field burning through residue removal. Removed residue can subsequently be used for producing energy that offsets GHG emissions associated with conventional fuel sources (e.g. fossil fuel-based electricity generation) or substituting material used in other production systems. Integrating all four components of net system emissions into one analysis underscores the following two main takeaways. First, the components of field GHG emissions and SOC change are the biggest opportunities for reducing net system emissions and need to be considered for effective climate change mitigation. Second, the reduction of C inputs through residue removal and increased soil aeration through multiple drainage will lower CH4 emissions but may also potentially decrease SOC stocks over time. Hence, we argue that future research needs to consider cross-component effects to optimize net system emissions, specifically the “stacking” of best management practices for mitigation related to field GHG emissions or SOC change in long-term experiments.