Table 2.

Effect of chlorpyrifos on the morphological parameters of Allium seedlings

Chlorpyrifos conc. (ppm)	Germination (%)	Survival (%)	Root length (cm)	Shoot length (cm)	Root shoot length ratio	Phytotoxicity (%)	Tolerance index	Seedling vigor index
0	100.00 ± 0.00f	100.00 ± 0.00f	12.90 ± 0.38e	20.67 ± 0.88g	0.62 ± 0.01c	0.00 ± 0.00a	0.00 ± 0.00a	3357.00 ± 119.35f
5	71.66 ± 1.67e	48.33 ± 4.41e	4.90 ± 0.26d	17.33 ± 0.17f	0.28 ± 0.01b	62.01 ± 2.05b	0.37 ± 0.02d	1593.66 ± 44.38e
10	45.00 ± 2.89d	40.00 ± 5.05d,e	2.30 ± 0.15c	14.43 ± 0.23e	0.15 ± 0.00a	82.17 ± 1.18c	0.17 ± 0.01c	753.33 ± 54.63d
15	43.33 ± 3.38c,d	31.66 ± 3.34c,d	2.13 ± 0.33b,c	10.83 ± 0.12d	0.19 ± 0.02a	83.46 ± 2.58c	0.16 ± 0.02c	564.66 ± 62.83c
20	36.67 ± 1.66c	28.33 ± 3.33b,c	1.43 ± 0.18a,b	8.73 ± 0.12c	0.16 ± 0.01a	88.88 ± 1.44d	0.11 ± 0.04b	373.66 ± 15.46b
25	28.33 ± 1.67b	18.33 ± 3.33a,b	1.30 ± 0.10a	6.33 ± 0.03b	0.20 ± 0.10a	89.92 ± 0.77d	0.10 ± 0.07b	216.00 ± 10.54a,b
30	18.33 ± 4.41a	13.33 ± 3.33a	0.90 ± 0.05a	3.40 ± 0.10a	0.26 ± 0.01b	93.02 ± 0.44d	0.06 ± 0.04b	77.83 ± 17.11a

Superscripts (a, b, c, d, e and f) represent groups which are significantly different at P < 0.05, as determined by ANOVA followed by Duncan’s multiple range test amongst the mean ± S.E. of 3 replicates at different treatment concentration when compared to control