Table 4.

Effects of T. capitata (T1, T2 and T3 are 4, 8 and 12 µL mL⁻¹ dose of essential oil), M. piperita (M1, M2 and M3 are 12, 16 and 20 µL mL⁻¹ dose of application), and S. chamaecyparissus (S1, S2 and S3 are 12, 16 and 20 µL mL⁻¹ dose of application) essential oils applied by irrigation against A. fatua on the efficacy (E), plant biometric variables [aerial part (APL), root (RL) and total length (TL), fresh (FW) and dry weights (DW)] and damage level (DL). Cw (only water, neither Fitoil nor EO application), Cf (0.03 μL Fitoil g⁻¹ of soil, no EO application). The damage level (DL) was assessed developing a damage scale ranging from 0 (no damage) to 4 (death of the plant). The efficacy (E) of a given EO was considered as its capacity to kill the plants and was assessed by attributing the value 0 if the plant was alive and 100 if the plant was dead. Both DL and E are dimensionless. Data are the arithmetic mean of 10 replicates.

Treatment/Dose	E	APL cm	RL cm	TL cm	FW g	DW g	DL
Cw	0 e	28.0 a	18.1 a	46.1 a	1.02 b	0.19 b	0.15 d
Cf	0 e	28.5 a	17.7 a	46.2 a	1.45 a	0.23 a	0.15 d
T1	80 abc	6.0 cd	3.3 c	10.4 cd	0.20 d	0.02 d	3.2 ab
T2	90 ab	2.4 cd	1.8 c	4.2 cd	0.09 d	0.02 d	3.6 ab
T3	100 a	0 d	0 c	0 d	0 d	0 d	4.0 a
M1	70 bc	5.0 cd	4.1 c	9.2 cd	0.09 d	0 d	3.0 b
M2	90 ab	1.4 d	0.5 c	1.9 cd	0.01 d	0 d	3.7 ab
M3	100 a	0 d	0 c	0 d	0 d	0 d	4.0 a
S1	30 d	16.3 b	9.3 b	25.6 b	0.57 c	0.09 b	1.4 c
S2	60 c	8.8 c	3.7 c	12.6 c	0.16 d	0.02 d	2.9 b
S3	60 c	5.0 cd	3.5 c	8.5 cd	0.06 d	0.01 d	3.1 ab

Different letters along the column indicate significant differences among treatments at p < 0.05.