Abstract
Rice plant and soil are playing vital role for produce of methane (CH4) emission from flooded rice soil. Contribution of rice plants and cover crop biomass amended soil on methane emission has not been yet studied under different cover crop biomass incorporated in paddy fields. Closed-chamber method was used to estimate CH4 emission rates during rice cultivation under soil plus rice plants and soil alone condition. Soil plus rice plants chambers 62 × 62 × 112 cm3 and soil alone chambers 20 × 20 cm2 were placed at the same time during rice cultivation (0 days after rice transplanting). Therefore, to evaluate the contribution of soil plus rice plants and soil alone on methane (CH4) emission under different rates of cover crop biomass incorporated soil during rice cultivation. Methane emission from soil plus rice plants increased up to 53 days after transplanting (DAT) and then it’s decreased and continued till harvesting. It was found that ca. 47% - 52% CH4 was mediated by rice plants and ca. 48% - 53% through rice soil alone under 12 Mg·ha-1 cover crop biomass incorporated treated plots. Whereas, only ca. 9% - 10% CH4 emission was mediated by rice plants and ca. 90% - 91% by rice soil alone when 0 and 3 Mg·ha-1 cover crop biomass was incorporated. Therefore, it could be concluded that rice soil alone was more influenced for CH4 emission than rice plants in paddy fields.
Highlights
Methane, a major component of natural gas is the second most important greenhouse gas (GHG) and the concentration of atmospheric CH4 was 700 1774 ppb in 2005 [1]
Higher CH4 emission rates were observed from paddy field due to incorporation of 6 Mg∙ha−1 or more cover crop biomass (Figure 1)
The highest peak of CH4 emission was observed at 30 days after transplanting (DAT) with organic amended soils
Summary
A major component of natural gas is the second most important greenhouse gas (GHG) and the concentration of atmospheric CH4 was 700 1774 ppb in 2005 [1]. It is the most potent GHG gas with global warming poten-. CH4 is a major issue in flooded rice culture accounting for 10% - 40% of the global CH4 emissions [2] [3] [4] and will continue to be a major source as global rice production needs to be increased to feed an ever increasing population, especially in Asian countries [5]. To meet up future demand, annual rice production must to be increased from 520 million tons to at least 880 million tons by 2025 [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
