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| Effects of reduced CRNF applications on N2O emissions and ammonia volatilization in spring maize soil |
| Received:May 23, 2015 |
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| KeyWord:CRNF;nitrogen application rate;N2O emission;ammonia volatilization;yield |
| Author Name | Affiliation | E-mail | | XIE Yong | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | RONG Xiang-min | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | rongxm2005@126.com | | ZHANG Yu-ping | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | HE Xin | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | SHI Dun-jie | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | LIU Qiang | Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Nutrition in common University, National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization, College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| Effects of controlled-release nitrogen fertilizer(CRNF) applied at different rates on N2O emissions and ammonia volatilization from spring maize soil were studied using both closed chamber with intermittent aeration and closed static chamber. The treatments were no-nitrogen control(T1), common urea at normal rate(240 kg·hm-2, T2); controlled-release urea at normal rate(240 kg·hm-2,T3); controlled-release urea at 10% less(216 kg·hm-2,T4); controlled-release urea at 20% less(192 kg·hm-2,T5); and controlled-release urea at 30% less(168 kg·hm-2,T6). Results showed that the dynamics of N2O emissions from the treatments T3~T6 were relatively stable, with no obvious peaks, compared with the treatment T2. Cumulative N2O emissions were 27.80%, 33.66%, 45.85%, and 55.12% lower in T3, T4, T5, and T6 than in T2, respectively. The N2O emissions in T3 and T4 were not significantly different from that in T2, whereas there were significant differences in N2O emissions between T2 and T5 and T6. However, no significant differences were found among CRNF treatments(T3~T6). The N2O emission had an exponential relationship with N application rate(P<0.01). The peak of ammonia volatilization in T2 emerged on the 2nd~4th day of fertilization, but on the 9th, 6th, and 1st~2nd day of base fertilization, seedling fertilization and panicle fertilization, respectively, in treatments T3~T6. The ammonia volatilization in T3 and T4 was 8.02% and 0.97% higher than that in T2, respectively, with no significant differences between them. However, the ammonia volatilization in T5 and T6 were 8.86% and 16.65% lower than that in T2. A linear relationship between ammonia volatilization and N application was found(P<0.01). The yields of maize in all treatments with N applications were significantly higher than in the control, but no significant differences were found among nitrogen-applied treatments. The present results suggest that appropriate reduction of CRNF would alleviate N2O emissions and ammonia volatilization while maintaining maize yields. |
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