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Abstract

In the present study, growth inhibition effect of 3,5-dichlorophenol was studied against Lemna gibba for 7 days. The different concentration of 3,5-dichlorophenol was tested against Lemna gibba. After treatments the following parameters of average specific growth rate, growth inhibition and yield reduction were calculated on 0-4, 4-7 and 0-7 days. The test met all the validation criteria as per OECD guideline 221 especially average specific growth rate were 0.273 and 0.289 day1501 for frond number and dry weight of fronds, respectively in control. Section by section average growth rate were 0.273, 0.326 and 0.295 day1501 for 0- 4, 4-7 and 0-7 day, respectively in control. The maximum average specific growth rate was noticed in 4-7 day. There was no growth rate was observed in entire exposure period at 8 mg L1501 concentration. In case of dry weight the average specific growth rate -0.005 day1501 was reduced at 8 mg L1501 concentration of 3,5-dichlorophenol. The maximum growth inhibition rate of 66.64 and 87.34 were observed for 0-4 and 0-7 days, respectively at 8 mg L1501 concentration. The effective concentration of 4.38 and 2.96 mg L1501 for growth inhibition rate frond on 0-4 and 0-7 days, respectively. The 100 yield reduction of frond was recorded inall the section at 8 mg L1501 concentration. More than 80 inhibition of growth rate and yield were recorded at 8 mg L1501 concentration in dry weight of frond.