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Tạp chí quốc tế 2018
Số tạp chí Vol 10 No 1 (2018)(2018) Trang: 49-55
Tạp chí: Journal of Vietnamese Environment

This  study resulted in a comparative analysis of  greenhouse gas emissions (GHGE) for rice production with different infield rice straw management practices based on an experiment conducted An Giang Province of  Vietnam, during the autumn - winter season  of  2016. Direct field  GHGE  was analyzed  based on in-situ   measurement and the   total   direct  and   indirect GHGE  were   estimated by  applying the life cycle assessment  using Ecoinvent3 database  which is  incorporated in SIMAPRO software. The experiment was conducted based on a completely random design  with  three  reatments and  three replications. The three treatments are [T1]  Incorporation of   straw and stubbles  treated  with   Trichoderma; [T2]  Incorporation  of stubbles and  removal   of  straw; and [T3]  In-field burning straw. Closed  chamber protocol  and  gas  chromatography (SRI  8610C) was used to measure and analyse CH4 and N2O. CH4 emission rate was not significantly  different (p>0.05) among  the  three   treatments  during sampling  datesexcept  on the  days  17  and  24  after sowing (DAS). N2O emission  rate  was not significantly different (p>0.05) either. However,  there were high variations of N2O emission after the dates of ure applied. Direct field emissions of CH4, N2O and CO2 equivalent (CO2eq) are not significantly  different  among  the  three  treatments, but the amount of CO2eq  per kg straw in T1 of  incorporating   rice straw treated  with Trichoderma is significantly higher than in T3 of  in-field  burning straw. LCA  based analysis resulted in total GHGE in  the  range  of  1.93-2.46 kg CO2-eq kg-1 paddy produced consisting of 53-66% from direct soil emissions. Incorporation  of straw treated  with  Trichoderma  did not  indicate the improvement of paddy yield. However, the  organic matter, N-NH4+, and N-NO3- of this treatment  was higher than those of the other researchedtreatments. This research was just conducted in one crop season, however, the results have initial implications for the other crop seasons. 

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