Pedosphere 10(3): 257--264, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of some management practices on electron transport system (ETS) activity in paddy soil |
| A. SUBHANI, LIAO Min, HUANG Chang-Yong and XIE Zheng-Miao |
| Natural Resources Science Dept., College of Natural Resources and Environmental Sciersces, Zhejiang University, Hangzhou 310029 (China) |
| ABSTRACT |
| Electron transport system (ETS)/dehydrogenase activity in a paddy field soil was measured under a variety of incubation conditions using the reduction of 2-(p-iodophenyl-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride (INT) to iodonitrotetrazolium formazan (INTF). The results exhibited a high positive correlation between the ETS activity and the incubation temperature and soil moisture. Dehydrogenase/ETS activity displayed a negative correlation with insecticide concentrations, and the activity affected adversely as the concentration of the insecticide increased. The higher doses, 5 and 10 field rates (1 field rate = 1500 mL ha-1), of insecticide significantly inhibited ETS activity, while lower rates failed to produce any significant reducing effect. Inorganic N (as urea) of concentrations from 0 to 100 μg N g-1 soil showed a positive response to ETS activity. However, at concentrations of 200 and 400 μg N g-1, the activity was reduced significantly. |
| Key Words: electron transport system (ETS) activity, insecticide, moisture, nitrogen, temperature |
| Citation: Subhani, A., Liao, M., Huang, C. Y. and Xie, Z. M. 2000. Effects of some management practices on electron transport system (ETS) activity in paddy soil. Pedosphere. 10(3): 257-264. |
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