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| Effects of nitrogen application rate and sources on yield of lettuce and nitrous oxide emission in vegetable soil |
| Received:April 07, 2016 |
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| KeyWord:lettuce;nitrous oxide;nitrogen application rate;emission reduction measure;emission factor |
| Author Name | Affiliation | E-mail | | YI Qiong | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | HUANG Xu | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | ZHANG Mu | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | HUANG Qiao-yi | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | PANG Yu-wan | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | TANG Shuan-hu | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | tfstshu@aliyun.com.cn |
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| Abstract: |
| Closed-chamber technology with gas chromatography method was used to study the effects of different nitrogen(N) application rates and sources on the yield of lettuce and nitrous oxide(N2O) emissions from vegetable soil. Seven treatments were including zero N fertilization(N0), 112.5 kg N·hm-2(N1), 225 kg N·hm-2(N2, conventional fertilization), 337.5 kg N·hm-2(N3), controlled release urea(CRU-N2), stability N fertilizer(SN-N2), integrate chemical and manure N fertilizer(MN-N2). The effects of different N levels and N sources with the same amount of N on characteristics of N2O emission, yield of lettuce were comparatively studied. Results showed that the N2O emission fluxes increased with the increasing of nitrogen fertilizer application. The optimum N rate to obtain the maximum yield of lettuce was 125 kg N·hm-2. Reasonable reduction of N application rate could effectively reduced N2O accumulative emission. Under the same N level condition, yield of lettuce increased by 13.3% and 17.2% with SN-N2 and MN-N2 compared with N2, however, there were not significant differences(P>0.05) for yield of lettuce between SN-N2, MN-N2 and N2. The total seasonal emission of N2O and N2O emission factor(EF)of SN-N2 only was 0.80 kg N·hm-2 and 0.36%,which was 84.8% and 1.97 percent point reduction compared to N2. In conclusion, optimized N fertilization rate along with stability N fertilization technology without sacrificing vegetable output is an important approach for N2O reduction emission and reducing on N loss in vegetable field. |
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