Effects of Some Management Practices on Electron Transport System （ETS） Activity in Paddy SoilEnglish Full Text
A. SUBHANI, LIAO MIN , HUANG CHANGYONG and XIE ZHENGMIAO 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- phellyl 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 ug N g-1 soil showed a positive response to ETS activity. However, at concentrations of 200 and 400 ug N g-1, the activity was reduced significantly.
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
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