Strategies for overcoming low agronomic nitrogen use efficiency in irrigated rice systems in China |
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| Institution: | 1. Crop, Soil, and Water Sciences Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines;2. Crop Physiology and Production Center, Huazhong Agricultural University, Wuhan, Hubei 430070, China;3. Agronomy Department, Agricultural College, Yangzhou University, Yangzhou, Jiangsu 225009, China;4. Rice Research Institute, Hunan Agricultural University, Changsha, Hunan 410128, China;5. Rice Research Institute, Guangdong Academy of Agricultural Science, Guangzhou, Guangdong 510640, China;6. College of Environmental and Natural Resources Sciences, Zhejiang University, Hangzhou, Zhejiang 310029, China;7. College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China;1. Africa Rice Center (AfricaRice), 01 BP 2031 Cotonou, Benin;2. Société Nationale d’Aménagement et d’Exploitation des Terres du Delta du fleuve Sénégal et des Vallées du fleuve Sénégal (SAED), BP 74 Saint-Louis, Senegal;3. AfricaRice, BP 96 Saint-Louis, Senegal;1. College of Resources and Environmental Sciences, China Agricultural University, Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture, Beijing, 100193, PR China;2. Biosystems Engineering Department, Auburn University, Auburn, AL, 36849, USA;3. College of Agricultural Engineering, Hohai University, Nanjing, 100193, PR China;4. National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing, 100021, PR China;5. Sino-France Institute of Earth Systems Science, Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, PR China;1. Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, People’s Republic of China;2. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, People’s Republic of China;3. Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, People’s Republic of China;4. Wuhu Dongyuan New Rural Development Co., LTD, Wuhu 241000, People’s Republic of China;1. International Center for Agro-Informatics and Sustainable Development (ICASD), College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China;2. Qixing Farm, Jiansanjiang, Heilongjiang Province, China;3. Department of Agronomy, Yangzhou University, Yangzhou, Jiangsu Province, China;4. Heilongjiang General Bureau of Agricultural Reclamation, Harbin, Heilongjiang, China |
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| Abstract: | Irrigated rice in China accounts for nearly 30% of global rice production and about 7% of global nitrogen (N) consumption. The low agronomic N use efficiency (AEN, kg grain yield increase per kg N applied) of this system has become a threat to the environment. The objective of this study was to determine the possibility to improve the AEN of irrigated rice in China by comparing the farmers’ N-fertilizer practices with other N management strategies such as real-time N management (RTNM) and fixed-time adjustable-dose N management (FTNM). Field experiments were conducted in farmers’ fields in four major rice-growing provinces in China in 2001 and 2002. The same experiment was repeated at the International Rice Research Institute (IRRI) farm in the dry seasons of 2002 and 2003. Agronomic N use efficiency was determined by the “difference method” using an N-omission plot. Maximum yield was achieved mostly at 60–120 kg N ha−1, which was significantly lower than the 180–240 kg N ha−1 applied in farmers’ practices at the Chinese sites. With the modified farmers’ fertilizer practice, a 30% reduction in total N rate during the early vegetative stage did not reduce yield but slightly increased yield and doubled AEN compared with the farmers’ practice at the Chinese sites. The total N rate in RTNM and FTNM ranged from 30 to 120 kg ha−1 at the Chinese sites, but their yields were similar to or higher than that of the farmers’ practice. Compared with the modified farmers’ practice, RTNM and FTNM further increased AEN at the Chinese sites. Overall, FTNM performed better than RTNM at the Chinese sites because the total N rate of FTNM was closer to the optimal level than RTNM. A quantum leap in AEN is possible in the intensive rice-growing areas in China by simply reducing the current N rate and by allocating less N at the early vegetative stage. |
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