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| Effects of controlled release fertilizer combined with rice straw on ammonia volatilization from doublecropping rice fields |
| Received:March 16, 2021 |
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| KeyWord:straw returning;slow-release fertilizer;controlled release fertilizer;double-cropping rice;ammonia volatilization;field water |
| Author Name | Affiliation | E-mail | | XIAO Qiliang | Longping Branch of Graduate School of Hunan University, Changsha 410125, China | | | ZHU Jian | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agri-Environment in the Middle Reach Plain of Yangtze River, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China
Hunan Dongting Lake Basin Engineering Research Center for Agricultural Non-point Source Pollution Control, Changsha 410125, China | | | PENG Hua | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agri-Environment in the Middle Reach Plain of Yangtze River, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China
Hunan Dongting Lake Basin Engineering Research Center for Agricultural Non-point Source Pollution Control, Changsha 410125, China | | | JIAN Yan | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agri-Environment in the Middle Reach Plain of Yangtze River, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China
Hunan Dongting Lake Basin Engineering Research Center for Agricultural Non-point Source Pollution Control, Changsha 410125, China | | | JI Xionghui | Longping Branch of Graduate School of Hunan University, Changsha 410125, China
Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agri-Environment in the Middle Reach Plain of Yangtze River, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China
Hunan Dongting Lake Basin Engineering Research Center for Agricultural Non-point Source Pollution Control, Changsha 410125, China | 1546861600@qq.com |
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| Abstract: |
| This study evaluated seven treatments to reduce ammonia(NH3) volatilization in double-cropping rice fields. These included two straw utilization methods[straw returning(R1) and straw removal(R0)] and three deep fertilization modes[conventional urea(CU), coated urea reduction(PU), and controlled urea reduction(LU)]. Conventional fertilization[surface application of urea(CF)] was used as a control. The effects of deep fertilization, straw utilization, and fertilization modes on surface water nitrogen concentrations, pH, and NH3 volatilization dynamics were investigated. Results of the study show that NH3 volatilization from early and late rice fields occurred primarily within one week of fertilization. Moreover, late rice fields exhibited considerably large NH3 volatilization than early rice fields. Total NH3 volatilization rates from treatment combinations of CF, CUR0, CUR1, PUR0, PUR1, LUR0, and LUR1 in double-cropping rice fields are:CF> CUR0>CUR1>LUR0>LUR1> PUR0>PUR1. Straw returning significantly affected NH3 volatilization, but had a negligible effect on nitrogen concentrations in field water. Compared to the R0 treatment, the NH3 volatilization with the R1 treatment was measurably reduced(by 8.67%). The fertilization mode significantly affects NH3 volatilization and nitrogen concentration in field water. Compared with the CU treatment, the NH3 volatilization from the PU and LU treatments was substantially reduced(by 75.68% and 39.14%, respectively). Moreover, there was a significant interaction between the straw returning method and fertilization mode. The combination of R 1 and PU produced the best results. Compared to the PUR0 treatment, the PUR1 treatment reduced NH3 volatilization by 15.07%. Results suggested that the combination of reduced nitrogen fertilizer, deep fertilization of coated urea, and straw returning is an effective and environmentally friendly strategy for nitrogen management in double-cropping rice production. |
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