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| Effects of Nitrogen Fertilizer Application Modes on Nitrous Oxide Emissions During Growing Season of Oilseed Rape（Brassica napus） |
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| KeyWord:N2O emission; nitrogen application modes; nitrogen use efficiency; grain yield; specific N2O emission; oilseed rape（Brassica napus） |
| Author Name | Affiliation | | ZHANG Yue-fang | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | ZHOU Wei | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | WANG Zi-chen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | CHEN Liu-gen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | ZHU Pu-ping | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | SHENG Jing | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences | | ZHENG Jian-chu | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences |
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| Abstract: |
| Deep point placement of nitrogen fertilizer has been shown to increase nitrogen use efficiency and grain yield, but its affect on N2O emissions is currently not well documented. This paper studied the effects of nitrogen fertilizer application modes, including surface broadcast placement（SN）, band placement（BN）, and hole placement（HN） of urea, plus an unfertilized control（CK）, on soil nitrous oxide（N2O） emissions during the oilseed rape-growing season from a rice-oilseed rape rotation field in the lower reaches of the Yangtze River. The results showed that the seasonal variation characteristic of N2O emission was significantly influenced by nitrogen fertilizer application. During the oilseed rape-growing season, CK had only one peak of N2O flux at 10 days after oilseed rape transplanting. However, SN, BN and HN had three peaks of N2O flux, and the largest peak was observed at 100 days after oilseed rape transplanting. Compared with SN, BN significantly increased seasonal N2O total emissions, nitrogen use efficiency and grain yield by 37.2%, 72.3% and 28.8%, while HN increased by 19.3%, 59.3% and 25.8%, respectively. The SN practice did not decrease specific N2O emission as compared with BN and HN, respectively. Relative to HN, BN significantly decreased specific N2O emission. Considering N2O emission and grain yield, the results of this preliminary study suggest that deep point placement of nitrogen fertilizer would not increase seasonal N2O total emissions; band placement of nitrogen fertilizer can effectively decrease N2O total emissions during the oilseed rape-growing season from the rice-oilseed rape rotation system as compared to hole placement. |
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