EFFECTS OF 234-D AND C PHOSATE ON SUBSTRATE INDUCED RESPIRATIONNamita Joshi and Deep Gupta
The present study examines the effect of herbicides viz. 2,4-D and glyphosate following the exposure of 20 days on ECso, 1/2 ECso and 'A ECso doses.The effect of these herbicides on substrate-induced respiration (SIR) was studied and showed varied results on I " and 20 day of treatment. 2,4-D significantly restricts the SIR on I" day when compared with control while insignificant recovery of SIR was noted on 20' day. Whereas glyphosate induces SIR initially but showed insignificant decrease recorded at the end of experiment. Microbial biomass also shows same trend of effects that was directly proportional to the dose concentration. Ratio of Basal and SIR were found suppressed in 2,4-D treatment on I day and 20 day. Glyphosate treatment recorded increased values for the BR: SIR ration I" day while Y4 ECso BR: SIR ratio shows higher values than control whereas 1/2 ECso and ECso concentrations recorded lesser values as compared to control on 20' day. 2,4-D and glyphosate, both restrict the present bacterial and fungal propagules although glyphosate observed relatively mild than that of 2,4-D.
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