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| Effects of organic fertilizer and controlled-release urea with reduced nitrogen on greenhouse gas emissions from ratoon rice paddies |
| Received:August 05, 2024 |
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| KeyWord:ratoon rice;greenhouse gas;global warming potential;organic fertilizer;controlled-release urea |
| Author Name | Affiliation | E-mail | | YU Qing | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | FENG Tao | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | DING Zijuan | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | KE Na | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | DUAN Hongbo | Hubei Rice Industry Technology Research Institute, Jingzhou 434200, China | | | NIE Jiangwen | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | ZHU Bo | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | | | JIANG Mengdie | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | mdjiang@yangtzeu.edu.cn | | LIU Zhangyong | Hubei Collaborative Innovation Center for Industrialization of Major Grain Crops, College of Agriculture, Changjiang University, Jingzhou 434200, China | lzy1331@hotmail.com |
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| Abstract: |
| To investigate the effects of combined application of organic fertilizer and controlled-release urea on greenhouse gas emissionsand yield in ratoon rice fields, five fertilization treatments were set up：conventional nitrogen application（FFP）, one-time side deep application of controlled-release urea（CRU）; Replacing 20% nitrogen with organic fertilizer+ one-time deep application of controlled-release urea（OF+CRU1）, reducing total nitrogen application by 10%+replacing 20% nitrogen with organic fertilizer+one-time deep application of controlled-release urea（OF+CRU2）, reducing total nitrogen application by 20%+replacing 20% nitrogen with organic fertilizer+one-time deep application of controlled-release urea（OF+CRU3）. Field monitoring of greenhouse gas emissions from paddy fields using static box gas chromatography method. The results showed that CH4 and N2O emissions from paddy fields were mainly concentrated in the first season, with their cumulative emissions accounting for 86.28%-89.39% and 72.88%-75.23% of the total emissions during the entire growth period, respectively; The CH4 and N2O emissions during the entire growth period of CRU treatment were reduced by 55.27% and 25.08%, respectively, compared to FFP treatment; Compared with CRU, the combination of organic fertilizer and controlled-release urea increased CH4 emissions throughout the growth period, but reduced N2O emissions; In the combination of three organic fertilizers and controlled-release urea treatments, the cumulative emissions of CH4 and N2O decreased with the decrease of total nitrogen application. Compared with FFP, CRU treatment reduced the global warming potential（GWP）of ratoon rice fields; The GWP of the combination of organic fertilizer and controlled-release urea was higher than that of the CRU treatment. Among the three organic fertilizer and controlled-release urea combination treatments, the order of GWP from highest to lowest was OF+CRU1>OF+CRU2>OF+CRU3. The Greenhouse gas emission intensity（GHGI）of CRU decreased by 54.69% compared to FFP; The GHGI of OF+CRU1, OF+CRU2, and OF+ CRU3 increased by 41.38%, 36.21%, and 41.38% respectively compared to CRU. Compared with FFP, Total yield of two seasons of CUR increased by 2.20%; The total yield of the two seasons treated with OF+CRU1 and OF+CRU2 increased by 9.58% and 9.27% respectively compared to CRU, but there was no significant difference in total yield between OF+CRU3 and CRU. There is a significant positive correlation（P<0.01）between CH4 emissions and net primary productivity（NPP）of rice aboveground parts, as well as soil NH4+-N and NO3--N content; N2O emissions were significantly negatively correlated with rice NPP（P<0.05）, and significantly positively correlated with soil NH4+-N and NO3--N content（P<0.01）. Research has shown that compared with the single application of controlled-release fertilizer in a single deep side, the combination of organic fertilizer substitution and controlled-release fertilizer application increased CH4 emissions but reduced N2O emissions. Among them, the OF+CRU2 treatment not only had the highest yield, but also produced the lowest greenhouse effect per unit yield. |
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