TABLE 2.

The mean values of replicates (n = 5) ± SD for root length (cm), root weight (g) of the different treatments, and controls (absence of Hg and presence of Hg).

No.	Length (cm)	Weight (g)	Sec. roots (No)	No.	Length (cm)	Weight (g)	Sec. roots (No)
11	15.5 ± 3.87	0.78 ± 0.16	0.00	69II	9.73 ± 0.88	0.5 ± 0.06b	1.20
18	13.3 ± 1.10	0.61 ± 0.07	6.50	74	13.05 ± 0.91	0.70 ± 0.09	0.50
20	17.1 ± 0.61	0.81 ± 0.15	0.50	76	17.18 ± 1.05	0.79 ± 0.11	0.25
21	6.50 ± 0.76a	0.31 ± 0.05b	0.00	79	13.70 ± 0.81	0.79 ± 0.03	0.00
22	8.10 ± 0.29a	0.36 ± 0.05b	0.00	80	7.23 ± 2.75a	0.40 ± 0.05b	0.00
23	12.93 ± 0.57	0.75 ± 0.11	0.75	112	13.68 ± 1.48	0.72 ± 0.12	0.00
25	8.60 ± 0.86a	0.5 ± 0.08b	0.00	130	12.83 ± 0.99	0.68 ± 0.05	2.00
31	11.95 ± 0.47	0.70 ± 0.07	1.00	146	13.50 ± 1.41	0.74 ± 0.05	0.00
43	16.40 ± 2.15	0.65 ± 0.10	1.20	168	7.83 ± 0.30a	0.37 ± 0.05b	1.25
48	15.77 ± 1.50	0.85 ± 0.13	0.00	197	14.53 ± 0.87	0.85 ± 0.15	0.75
50	10.82 ± 1.68	0.50 ± 0.02b	0.00	211	13.10 ± 0.87	0.89 ± 0.06	0.75
57	7.57 ± 0.48a	0.27 ± 0.03	0.00	Cont. −Hg	7.63 ± 0.06a	0.42 ± 0.01b	0.15
69I	14.82 ± 1.72	0.52 ± 0.13b	2.00	Cont. +Hg	1.48 ± 0.02	0.05 ± 0.00	0.00

Data with superscripts indicate that there are no significant differences with control without Hg (Duncan’s test; “a” for length and “b” for weight). The absence of superscripts means that the means are statistically different from control without Hg. The shaded cells indicate that the differences with control without Hg are statistically significant (p < 0.05). The number of secondary roots is not accompanied by ± SD since it is a discrete variable.