Residual Concentrations of Diazinon and Dursban and its Impacts on Soil and Carrot

摘要

At early growth stage after application of two pesticides, the growth of Carrot (Daucus carota L.) was enhanced but at middle and mature stages the growth rate was slowed down. At initial stage the response of uptake Diazinon ranged from 0.302 μg l-1 to 3.064 μg l-1 (Diazinon doses were 0.50 l ha-1, 1.00 ha-1, 2.00 l ha-1 and 4.00 l ha-1); in second stage and at maturity stages the uptake ranged from 3.064 μg l-1 to 3.757 μg l-1 and 0.400 μg l-1 to 4.089 μg l-1 respectively. On the other hand, the residual values of Diazinon at different doses at different times ranged from 0.270 μg l-1 to 3.426 μg l-1. The residual effect and responses between soil and carrot were positively correlated at 0.01 level (r=1.00). In case of Dursban application at different doses were responded of uptake by Carrot ranged from 0.205 μg l-1 to 2.580 μg l-1 at rate of 0.50 l ha-1, 1.00 ha-1, 2.00 l ha-1 and 4.00 l ha-1 throughout the growth stages. On the other hand, the residual values of Dursban at different doses ranged from 0.443 μg l-1 to 0.329 μg l-1. The significant level of residual effect and responses between soil and carrot were correlated positively at 0.01 level (r=0.986) and at 1st sampling correlated at 0.05 level (r=0.0.951) and at 2nd and 3rd sampling there were no significant relation were found (r=0.854) with respective sampling time. The experiment concluded that there was a positive response of plant uptake and residual effect in soil was occurred in both pesticides.