Table 2.

Kinetics for fipronil degradation in soil by FA.

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	+	48.83f ± 1.91	16	0.91	0.044 ± 0.005	0.96 ± 0.11
			−	49.95ef ± 0.96	15	0.97	0.046 ± 0.002
		Non-sterile	+	83.89a ± 1.51	5	0.99	0.127 ± 0.004	1.63 ± 0.08
			−	66.90c ± 2.09	9	0.96	0.078 ± 0.003
	20	Sterile	+	59.73cd ± 0.84	11	0.99	0.065 ± 0.001	12.10 ± 0.93
			−	7.23i ± 0.68	129	0.89	0.005 ± 0.000
		Non-sterile	+	56.11de ± 2.37	12	0.98	0.056 ± 0.002	1.91 ± 0.18
			−	33.33g ± 1.94	24	0.90	0.029 ± 0.003
150	100	Sterile	+	43.42f ± 1.68	17	0.95	0.040 ± 0.006	3.01 ± 0.23
			−	17.53h ± 0.43	52	0.94	0.013 ± 0.001
		Non-sterile	+	76.10b ± 3.51	6	0.98	0.119 ± 0.006	1.52 ± 0.08
			−	65.98c ± 1.91	9	0.99	0.078 ± 0.002
	20	Sterile	+	44.99f ± 2.63	16	0.91	0.043 ± 0.004	6.50 ± 0.67
			−	8.93i ± 0.68	105	0.91	0.007 ± 0.000
		Non-sterile	+	56.72de ± 0.91	11	0.94	0.063 ± 0.004	2.03 ± 0.23
			−	35.25g ± 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 FA to the degradation rates of fipronil (Equation 3). Standard errors are calculated via the error propagation method.