Table 2.

Assay performance. Specific growth rate (SGR, d⁻¹) and photosynthetic efficiency (ΔF/F_m′) measurements of control and reference (diuron, 4 µg L⁻¹) treatments and diuron reference percent inhibition effect (Ref. inh (%)) (mean ± SD; n = 5 per treatment).

Herbicide	SGR d−1			ΔF/Fm′
	Control	Reference	Ref. inh. (%)	Control	Reference	Ref. Inh. (%)
Diuron	1.20 ± 0.01	0.82 ± 0.03	31.4 ± 2.14	0.53 ± 0.01	0.10 ± 0.01	80.2 ± 1.4
Metribuzin	1.29 ± 0.02	0.55 ± 0.04	57.2 ± 2.8	0.47 ± 0.01	0.03 ± 0.01	93.9 ± 1.4
Hexazinone	1.24 ± 0.04	0.77 ± 0.06	37.7 ± 4.8	0.51 ± 0.01	0.08 ± 0.01	84.8 ± 1.0
Bromacil	1.07 ± 0.06	0.47 ± 0.06	55.9 ± 5.8	0.45 ± 0.02	0.05 ± 0.01	89.0 ± 1.8
Tebuthiuron	1.27 ± 0.02	0.59 ± 0.06	46.4 ± 4.3	0.47 ± 0.01	0.01 ± 0.01	97.7 ± 2.2
Simazine	1.18 ± 0.03	*0.92 ± 0.06	*22.0 ± 5.1	0.49 ± 0.01	0.08 ± 0.01	83.2 ± 0.8
Propazine	1.19 ± 0.02	0.61 ± 0.05	48.3 ± 3.8	0.52 ± 0.01	0.10 ± 0.01	81.4 ± 1.9
Imazapic	1.22 ± 0.03	0.85 ± 0.02	30.1 ± 2.2	0.52 ± 0.01	0.11 ± 0.01	78. 7 ± 1.2
Haloxyfop	1.18 ± 0.05	0.80 ± 0.01	31.8 ± 1.4	0.47 ± 0.01	0.10 ± 0.01	78.4 ± 2.0
2,4 D	1.13 ± 0.07	0.71 ± 0.04	37.0 ± 3.8	0.47 ± 0.01	0.07 ± 0.01	84.5 ± 1.9

*Note for the simazine toxicity bioassay, a reference treatment of diuron, 2 µg L⁻¹ was used instead of 4 µg L⁻¹ and therefore not included in calculations of the total mean.