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| Identification of Nitrogen Isotope for Organic Vegetables and Soils in Beijing, China |
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| KeyWord:Beijing; organic agriculture; vegetable; δ15N; synthetic nitrogen |
| Author Name | Affiliation | | LI Guang-de | College of Resources and Environmental Sciences, Shandong Agricultural University | | QIN Feng-qin | College of Sciences, China Agricultural University, | | ZHUGE Yu-ping | College of Resources and Environmental Sciences, Shandong Agricultural University | | LI Xue-qian | College of Resources and Environmental Sciences, China Agricultural University | | MENG Fan-qiao | College of Resources and Environmental Sciences, China Agricultural University | | WU Wen-liang | College of Resources and Environmental Sciences, China Agricultural University | | GUO Yan-bin | College of Resources and Environmental Sciences, China Agricultural University |
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| Abstract: |
| Organic vegetable production prohibits the use of synthetic nitrogen（N） fertilizer and this leads to the differences on δ15N for vegetable and soil from organic farm, which can be utilized as the approach to identify organic vegetable from conventional products. We selected 5 organic and 1 conventional vegetable bases from Beijing suburb and sampled their soil and vegetables for the analysis of δ15N. Research indicated that as organic operation period and organic fertilizers amount increased, total N and δ15N of soil had the tendency of increase and, vegetable reflected sensitively for the fertilizer applied of its δ15N. The relationship between vegetable δ15N and total N, vegetable δ15N and soil δ15N, soil δ15N and soil total N can be modeled by linear regression with significant level of correlation（P<0.01）. Adoption of 15N can effectively reflect the using of synthetic nitrogen fertilizer for tomato production but not for celery, which obtained false negative result in Beijing. For organic vegetables in Beijing, δ15N of leave, root and fruit vegetables was higher than 7.55‰, 7.64‰ and 5.42‰ respectively at 95% probability level. δ15N value can be adopted as an effective tool but not as the sole tool for identifying if synthetic N was applied in vegetable production and farming record, on-site inspection and other measures should be also employed together. |
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