3.1 Dissipation dynamics of pesticides in nutrient solution.
The
dissipation dynamic of CLO, DFN and DFZ in nutrient solution during the
experimental period were shown in Fig 1 A , and the half-lives
(t1/2) of the
pesticides in nutrient solution were shown in Table 2 . None of
the target pesticides were detected in the control group C1. The three
pesticides showed the same dissipation trend, and all of them followed
the first-order kinetics. Approximately 80-90% of pesticides were
degraded in nutrient solution during the 28-day experimental period, and
the dissipation half-lives of CLO, DFN and DFZ were 6.3, 11.5 and 13.8
days, respectively. However, in unplanted nutrient solution, the
dissipation half-lives of CLO, DFN and DFZ were 12.4, 15.8 and 18.2
days, respectively.
The effects of exogenous SA on the dissipation dynamics of pesticides
are shown in Fig 1 B, C, D and the half-lives
(t1/2) are shown in Table 2 . For CLO,
the half-lives decreased by 8%
and 35% with
supplementing SA at 1mg L-1 and
10 mg L-1, respectively, compared with the without SA
treatments. For DFN, the
half-lives decreased by 14% and 40% with
supplementing SA at 1mg L-1 and
10 mg L-1, respectively, compared with the without SA
treatments. For DFZ, the half-lives decreased by 8%, 61% and 28%
with
supplementing SA at 1mg L-1, 10
mg L-1 and 50 mg L-1, respectively,
compared with the without SA treatments.