Nitrous oxide emission from herbicide-treated soybean |
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| Authors: | Zhang Lifeng Pascal Boeckx C Guanxiong Oswald Van Cleemput |
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| Institution: | (1) Institute of Applied Ecology, Chinese Academy of Science, P.O. box 417, 110015 Shenyang, China e-mail: gxchen@iae.syb.ac.cn, CN;(2) Faculty of Agricultural and Applied Biological Sciences, Ghent University, Department of Applied Analytical and Physical Chemistry, Coupure 653, 9000 Gent, Belgium, BE |
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| Abstract: | The emission of N2O from soybean plants treated with the herbicides dichlorophenoxyacetic acid (2,4-D) and bromoxynil was studied. The N2O flux from 2,4-D- and bromoxynil-treated soybean was 14.1 ng N2O-N g–1 fresh weight h–1 and 19.7 ng N2O-N g–1 fresh weight h–1, respectively, i.e. approximately twice that of the controls. The NO2
–-N concentration in 2,4-D- and in bromoxynil-treated soybean was about 8 μg N g–1 fresh weight, i.e. fivefold the concentration found in control plants. The NO3
– content in herbicide-treated soybean did not differ significantly from that of the control plants. Consequently, the accumulation
of NO2
–-N during the assimilation of NO3
–-N was thought to cause the observed N2O release. Probably, N2O is a by-product produced during either the reaction of NO2
–-N with plant metabolites or NO2
–-N decomposition. Final conclusions must await further experiments.
Received: 5 November 1999 |
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| Keywords: | Nitrous oxide emission Herbicides Soybean Dichlorophenoxyacetic acid Bromoxynil |
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