Reducing greenhouse gas emission by alternation of the upland crop rotation in the Mekong Delta, Vietnam

Abstract

Agricultural production is one of the main sources of anthropogenic greenhouse gas (GHG) emissions, contributing 50% and 60% of CH<sub>4</sub> and N<sub>2</sub>O emissions, respectively. This study evaluated the rice yield and components, the CH<sub>4</sub> and N<sub>2</sub>O emissions and the global warming potential between the triple rice (R-R-R) and sesame-rice rotation (S-R-R) systems in Can Tho city, Vietnam. The experiments were conducted in three cropping seasons: spring-summer 2016, summer-autumn 2016, and winter-spring 2016–2017. The results showed that there was no significant difference in the yield components and grain yield between the triple rice and sesame-rice rotation systems. The application of a sesame rotation in rice-based system could reduce the CH<sub>4</sub> and N<sub>2</sub>O emission by 30.5% and 18.7%, respectively. The global warming potential in the S-R-R rotation was 9 860 kg CO<sub>2e</sub>/ha, significantly lower than the R-R-R rotation (12 410 kg CO<sub>2e</sub>/ha) by 20.6%. These results show that the S-R-R rotation has the potential to mitigate the GHG emissions, especially CH<sub>4</sub>, which contributes a large amount of emissions in the rice cultivation.

Effect of Alternate Wetting and Drying on the Emission of Greenhouse Gases from Rice Fields on the Northern Coast of Peru

“…Emission fluxes were determined from the slope through linear regression, the concentration of CH 4 or N 2 O against chamber closure time [13,30]. Then, the slope was converted to mass per unit area per unit time (mg m −2 h −1 ) through Equation ( 3) [3,29]:…”

Response of Bacterial Community Structure in the Bulk Soil and Rice Straw Residues under Different Crop Rotation Systems

“…In the agricultural systems, several management practices including crop monocultivation, fertilizer application, soil preparation, and various crop rotation systems such as triple rice or rice-upland crops have been found with significant impacts on the structure and diversity of microbial communities in the soil [8][9][10][11][12]. Recently, farmers in the Vietnamese Mekong Delta (VMD) region have converted the intensive rice cultivation system into the rice-upland crops rotation model due to the change in environmental conditions [13][14][15][16]. Previous studies reported that bacterial communities had been associated with the decomposition of rice straw residues in flooded rice soil microcosms [15,[17][18][19].…”