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.