|
| Impacts of biochar and biochar-based fertilizer application on N2O emissions and nitrogen leaching in a sweet corn field |
| Received:January 08, 2025 |
| View Full Text View/Add Comment Download reader |
| KeyWord:vegetable field;straw biochar;biochar-based fertilizer;N2O;leaching loss |
| Author Name | Affiliation | E-mail | | WANG Yanpei | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China | | | ZHANG Jing | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | JIANG Wenqian | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China | | | ZHU Junyi | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China | | | WU Jinshui | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China | | | SHEN Jianlin | Institute of Subtropical Agriculture, Chinese Academy of Sciences/Changsha Agricultural Environment Observation and Research Station, Changsha 410125, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China | jlshen@isa.ac.cn |
|
| Hits: 1114 |
| Download times: 1131 |
| Abstract: |
| A field experiment was conducted in a sweet corn field located on the suburban area of Changsha City, Hunan Province, to investigate the effects of straw derived biochar applied directly and as a component in biochar-based fertilizer combined with reduced nitrogen fertilizer application on greenhouse gas emissions and nitrogen leaching. The experiment comprised four treatments：no fertilizer application（CK）, conventional nitrogen fertilizer application（CON）, 20% reduced nitrogen fertilizer + direct straw biochar application （BC）, and 20% reduced nitrogen fertilizer + biochar-based fertilizer application（BF）. Static chamber-gas chromatography was employed to monitor N2O emission fluxes during the sweet corn growing season. Additionally, nitrogen losses from leaching, corn yields, nitrogen fertilizer use efficiency, and changes in soil factors were assessed. The results showed that compared to the CON treatment, both BC and BF treatments significantly decreased N2O emissions. Notably, the BF treatment exhibited a significant reduction in the N2O emission factor by 11.6%, while the unit yield-based N2O emissions for BF and BC treatments were significantly reduced by 33.9% and 26.4%, respectively. TN leaching factors for CON, BF, and BC treatments were 27.0%, 26.3%, and 48.0%, respectively, indicating that the loss rate of nitrogen fertilizer through TN leaching was less in BF treatment as compared to BC treatment, with no significant differences between BF and CON. Compared to the CON treatment, the BC treatment significantly increased the TN leaching factor, while there was no significant difference for the BF treatment. However, when compared to the BC treatment, the TN leaching factor of the BF treatment was significantly reduced by 45.8%. There were significant differences in TN leaching per unit yield among the treatments, with the BF treatment showing a significant 35.0% reduction in TN leaching per unit yield compared to the CON treatment. The BF treatment showed a significant decrease in soil NH+4-N and NO-3-N contents by 28.7% and 10.4%, respectively, compared to the BC treatment. The application of straw biochar and biochar-based fertilizer significantly increased sweet corn yields and nitrogen fertilizer use efficiency by 14.6% to 17.2% and 29.9% to 53.4%, respectively. In summary, the combined application of biochar and biochar-based fertilizer with nitrogen reduction significantly reduced N2O emissions and increased sweet corn yield. Furthermore, biochar-based fertilizer reduced nitrogen leaching losses, whereas direct application of biochar increased nitrogen leaching losses. Therefore, biochar-based fertilizer can be considered as an optimized biochar application strategy for nitrogen fertilizer reduction and minimizing nitrogen losses in vegetable fields. |
|
|
|
