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More rice with lower emissions and lower water consumption


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Presented by Abubakar Girei on May 9, 2019, as part of the first CCAFS & GRA CLIFF-GRADS Webinar Series. See the Introduction for more details: 2019 CLIFF-GRADS Webinar Series - Using modeling, life cycle assessment, and trade-off analysis to understand low emissions development options.

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More rice with lower emissions and lower water consumption

  2. 2. Purpose of research Irrigated rice production systems are important sources of livelihoods and greenhouse gas emissions. Yet, the high water demands associated with irrigated rice production makes it vulnerable to conditions of limited or sporadic water supply and high air temperatures. A new collaborative multidisciplinary research project funded through FONTAGRO is currently being implemented in Colombia (FEDEARROZ), Chile (INIA) and Perú (UNALM). This project aims to compare socio-economic and environmental impacts of continuously flooded rice production systems to those of two water saving practices: safe alternate wetting and drying (AWD1) and intense AWD2.
  3. 3. Research methods Experimental site: Lagunas experimental station in the municipality of Saldaña, Tolima. Experimental design: Randomize Complete Block Design Total Plot size: 4050m2 (9 plots of 10m X 5m each) Treatments: AWD1 (water level at 5 cm below the soil surface), AWD2 (level of water at 10 cm below the soil surface) and Continuous Flooding (water level at 3 cm above the soil surface) Rice Variety: FEDEARROZ 67 Planting Method: Direct sowing
  4. 4. Research methods Measurements of methane and nitrous oxide from the ground Collection of gas samples for determination of CH4 and N2O was carried out by the closed-chamber technique. Sampling of emitted gases was conducted one day before and three days after each fertilization and when the criteria of the AWD1 and AWD2 treatments (water levels) are met Gas sample in each chamber every 15 minutes between 9 a.m. to 11 a.m. The concentrations of methane and nitrous oxide in each of the samplings carried out to date were analyzed by means of a GC-2014 Shimadzu reference gas chromatograph in the laboratory of the International Center for Tropical Agriculture _ CIAT. The fluxes of the gases was calculated from the rate of change of the concentration of carbon dioxides, methane and nitrous oxide in the chamber headspace using a linear regression method
  5. 5. Results Figure 1. Daily methane and nitrous oxide flows in a 31-day evaluation period
  6. 6. Results Período de muestreo (días) 0 5 10 15 20 25 30 35 Emisiones(mgN2Om -2 d-1 ) -10 -5 0 5 10 15 20 Inundado AWD1 AWD2 1ra dosis de fertilización 0 1 2 3 4 Emisiones(mgN2Om-2d-1) -5 0 5 10 15 Figure 2. Daily Nitrous oxide flows for the first dose of fertilizer
  7. 7. Conclusions Result from this studies though not completed shows that AWD represents an innovative water management practice that can contribute to the adaptation and mitigation of climate change in family rice farms and at the same time support a sustainable intensification of water management expressed in kg of rice produced per cubic meter used.
  8. 8. Advice to future CLIFF-GRADS students • CLIFF-GRADS provides opportunity to connect with researchers from your host institution as well as with researchers outside the Institute. Make sure you use the opportunity to pave way for future collaborations as this will benefit your future career. • Also try and attend or participate in as many as possible seminars, conferences and training that will be organise by your host institution as well as other institution near-by. • Use the opportunity of the research visit to create frequent interactions with your host supervisor, fellow interns (if available) and institutes staffers to enabled you further develop your proposed methodology and ideas. • Use the experiences that will be gained during the research visit to enhance your core competencies, which are or may not have being addressed in your former research experiences.