Table 3.

Kinetics for fipronil degradation in soil by FB.

Pesticide concentration (μg/g)	Soil Moisture (%)	Soil sterility	Isolate inoculation*	D (%) ± SD**	t1/2 (day)***	R2****	k***** ± SE (day−1)	k******(+/−) ± SE
15	100	Sterile	+	51.08c ± 1.73	12	0.88	0.059 ± 0.006	1.27 ± 0.13
			−	49.95c ± 0.96	15	0.97	0.046 ± 0.002
		Non-sterile	+	69.71b ± 4.27	8	0.97	0.090 ± 0.004	1.15 ± 0.07
			−	66.90b ± 2.09	9	0.96	0.078 ± 0.003
	20	Sterile	+	41.65cd ± 0.62	18	0.87	0.039 ± 0.004	7.27 ± 0.94
			−	7.23e ± 0.68	129	0.89	0.005 ± 0.000
		Non-sterile	+	84.24a ± 1.22	5	0.99	0.135 ± 0.004	6.67 ± 0.44
			−	33.33d ± 1.94	24	0.90	0.029 ± 0.003
150	100	Sterile	+	46.46c ± 2.44	17	0.93	0.040 ± 0.003	3.02 ± 0.26
			−	17.53e ± 0.43	52	0.94	0.013 ± 0.001
		Non-sterile	+	83.92a ± 5.13	4	0.96	0.171 ± 0.011	2.19 ± 0.14
			−	65.98b ± 1.91	9	0.99	0.078 ± 0.002
	20	Sterile	+	40.02cd ± 7.84	17	0.89	0.040 ± 0.005	6.11 ± 0.90
			−	8.93e ± 0.68	105	0.91	0.007 ± 0.000
		Non-sterile	+	44.06cd ± 1.29	16	0.97	0.044 ± 0.002	1.41 ± 0.15
			−	35.25d ± 3.45	22	0.98	0.031 ± 0.003

SE: Standard error (n = 3). SD: Standard deviation (n = 3).

^*+ and − indicate soils with and without isolate inoculation, respectively.

^**Degradation after 14 days. Values with the same lowercase superscript letters in the column do not defer significantly (Tukey’s HSD post hoc test, p = 0.05).

^***Half-lives of fipronil are calculated based on the first-order exponential decay model (Torabi et al., 2017).

^****The first-order exponential decay model coefficient of determination (Torabi et al., 2017).

^*****Fipronil degradation rates based on the first-order exponential decay model (Torabi et al., 2017).

^******The contribution of FB to the degradation rates of fipronil (Equation 3). Standard errors are calculated via the error propagation method.