Table 3.

Germination rate and plant-growth parameters in Baccharis linearis plants sown and grown in non-irradiated or irradiated tailing substrates from Huana and Tambillos.

Study sites	Growth parameters†, ‡	Non-irradiated substrate	Irradiated substrate	Statistic	p-value¶
Huana	Germination (%)	71.6 ± 4.5	67.6 ± 6.6	T = − 0.34	0.7356
	Height (mm)	22.9 ± 0.8	15.0 ± 0.7	T = − 7.38	**
	Number of leaves	7.3 ± 0.1	5.0 ± 0.2	W = 1294.5	**
	Primary root length (mm)	36.8 ± 1.3	28.3 ± 2.2	T = − 3.46	**
	Number of secondary roots	1.9 ± 0.3	1.2 ± 0.2	W = 253.5	*
	Shoot dry weight (μg)	382.0 ± 19.6	195.1 ± 30.8	T = − 5.11	*
	Root dry weight (μg)	69.8 ± 6.4	32.1 ± 3.0	T = − 5.77	**
	Root/shoot ratio	0.2 ± 0.0	0.2 ± 0.0	T = 0.25	= 0.8088
Tambillos	Germination (%)	76 ± 4.5	67.2 ± 4.5	T = − 1.41	= 0.1757
	Height (mm)	23.6 ± 0.9	14.7 ± 0.6	T = − 8.37	**
	Number of leaves	7.8 ± 0.2	5.3 ± 0.2	W = 1314.5	**
	Primary root length (mm)	27.2 ± 1.8	28.8 ± 3.7	T = 0.13	= 0.8973
	Number of secondary roots	2.7 ± 0.4	0.6 ± 0.2	W = 130	**
	Shoot dry weight (μg)	496.4 ± 29.9	172.9 ± 18.5	T = − 9.22	*
	Root dry weight (μg)	92.5 ± 9.9	61.5 ± 6.1	T = − 2.62	*
	Root/shoot ratio	0.2 ± 0.0	0.4 ± 0.0	T = 5	*

^†Plant-growth parameters were measured seven weeks after sowing.

^‡Values represent averages ± SE of 50 replicates per treatment.

^¶Significant differences considering irradiation as factor, T-Student test (T) or Wilcoxon (W).

*p < 0.05.

**p < 0.01.