Table 1.

Effect of 2,5-bis(alkylamino)-1,4-benzoquinones on the radicle growth of C. sativus and S. bicolor at 1.0 × 10^-3 mol/L.

Compound	Cucumis sativus				Sorghum bicolor
	24 h		48 h		24 h		48 h
	Radiclelength [cm]a	Inhibition [%]	Radiclelength [cm]a	Inhibition [%]	Radiclelenght [cm]a	Inhibition [%]	Radiclelength [cm]a	Inhibition [%]
12	1.40 def	42	1.94 fg	59	0.87 cd	36	1.04 fg	30
13	1.75 cde	28	3.91 bcd	18	1.90 ab	-40	3.50 abc	-135
14	2.17 abc	10	4.87 a	-2	1.69 ab	-24	3.70 ab	-148
15	2.02 abc	17	3.43 de	28	1.14 bcd	17	1.87 defg	-26
16	2.02 abc	17	4.24 abcd	11	1.52 abc	-12	1.91 defg	-28
17	1.89 bcd	22	2.73 ef	43	1.17 bcd	14	2.25 bcdef	-51
18	1.25 ef	48	1.25 g	74	0.49 d	64	0.51 g	66
19	2.26 abc	7	3.73 ef	22	1.81 ab	-33	3.81 a	-156
20	1.85 cd	24	2.33 f	51	1.23 bcd	10	2.07 cdef	-39
21	2.46 a	-2	4.41 abc	7	2.09 a	-54	3.21 abcd	-115
22	1.16 f	52	1.79 fg	62	0.85 cd	38	0.92 fg	38
23	2.10 abc	13	4.41 abc	7	1.47 abc	-8	2.82 abcde	-89
Control	2.42 ab		4.76 ab		1.36 abc		1.49 efg

^a Means, in the same column, with the same letter are not significantly different at P = 0.05% by Tukey’s test.