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Publication
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| Research Title |
Decomposition, greenhouse gas emissions, and nitrogen release of rice straw and its derived biochar in paddy soil under anaerobic incubation |
| Date of Distribution |
20 September 2023 |
| Conference |
| Title of the Conference |
Tropentag 2023 |
| Organiser |
Leibniz Centre for Agricultural Landscape Research (ZALF) and Humboldt-Universität zu Berlin |
| Conference Place |
Humboldt-Universität zu Berlin |
| Province/State |
Berlin |
| Conference Date |
20 September 2023 |
| To |
22 September 2023 |
| Proceeding Paper |
| Volume |
2023 |
| Issue |
1 |
| Page |
108 |
| Editors/edition/publisher |
Eric Tielkes |
| Abstract |
Organic soil amendments like rice straw improve soil fertility by decomposition process. However, the decomposition under anaerobic conditions results in CH4 production. Using pyrolysis to produce biochar may reduce CH4 production and subsequently affects nutrient availability such as nitrogen in soils. This research investigated the effects of application of rice straw (RS, 10 t ha-1) and its derived biochar (BC, 3 t ha-1) on decomposition, greenhouse gas emissions, and nitrogen release in a 56-day anaerobic incubation experiment of submerged paddy soil. Our results showed that the RS treatment had the highest CO2 and CH4 emission rates, while the BC treatment had significantly lower emission rates, similar to the control. The CO2 emission rate of RS were higher than the BC and control from day 3, with the highest value at week 5 (352.6 g CO2 m-2 d-1). Meanwhile, the CO2 emission rate in BC was increased after two weeks and were highest at week 6 (146.6 g CO2 m-2 d-1). Conversely, the CH4 emission rate of all treatments gradually increased after week 2. RS soil had the highest CH4 emission rate at week 5 (757.1 g CH4 m-2 d-1) and BC soil had the highest CH4 emission rate in week 4 (1.11 g CH4 m-2 d-1). Extractable NO3- content was higher in RS than in BC, while extractable NH4+ content was higher in BC than in RS. The highest contents of extractable NO3- and NH4+ in RS treatment were found in weeks 3 (4.7 mg kg-1) and 4 (165.0 mg kg-1), respectively. Meanwhile, the highest contents of extractable NO3- and NH4+ in BC treatment were found in weeks 4 (2.6 mg kg-1) and 5 (285.9 mg kg-1), respectively. Our findings indicated that transforming rice straw into biochar before soil application strongly reduces the decomposition and subsequently reduces CH4 and CO2 emissions from paddy soil. Furthermore, rice straw and biochar showed contrasting effects on NO3- and NH4+ availability that should be considered in fertilization management. |
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| Peer Review Status |
มีผู้ประเมินอิสระ |
| Level of Conference |
นานาชาติ |
| Type of Proceeding |
Abstract |
| Type of Presentation |
Poster |
| Part of thesis |
true |
| Presentation awarding |
false |
| Attach file |
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| Citation |
0
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Journal Publication
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