TABLE 1.

Effective dose (ED) of N‐trans‐cinnamoyltyramine (NTCT) on the mean shoot and root growth of eight test plant species.

Species	Tissue	Equation (LL.4)	R‐square	ED10 (SE) a	ED50 (SE)	ED90 (SE)
				μM
Canola	Shoot	y = −0.34+$\frac{109.2+0.34}{1+\exp \left(-1.8\left(\log \left(x\right)-\log \left(5.8\right)\right)\right)}$	0.99	1.63 (±0.49)	5.29 (±0.84)	13.7 (±5.0)
	Root	y = 1.67+$\frac{101.1-1.67}{1+\exp \left(-1.9\left(\log \left(x\right)-\log \left(2.4\right)\right)\right)}$	0.99	0.70 (±0.29)	2.40 (±0.23)	7.39 (±2.41)
Cress	Shoot	y = −24.2+$\frac{101+24.2}{1+\exp \left(-0.58\left(\log \left(x\right)-\log \left(0.19\right)\right)\right)}$	0.99	0.036 (±0.045)	0.37 (±0.19)	10.8 (±6.8)
	Root	y = −11+$\frac{96.9+11}{1+\exp \left(-0.98\left(\log \left(x\right)-\log \left(0.41\right)\right)\right)}$	0.99	0.098 (±0.03)	0.54 (±0.09)	6.38 (±3.3)
Lettuce	Shoot	y = −8.3+$\frac{122.7+8.3}{1+\exp \left(-0.68\left(\log \left(x\right)-\log \left(1.55\right)\right)\right)}$	0.97	0.11 (±0.26)	1.12 (±1.15)	7.75 (±3.08)
	Root	y = −28.8+$\frac{122.3+28.8}{1+\exp \left(-0.55\left(\log \left(x\right)-\log \left(0.63\right)\right)\right)}$	0.97	0.092 (±0.21)	0.73 (±0.87)	6.56 (±2.51)
Amaranth	Shoot	y = 9.7+$\frac{401.6-9.7}{1+\exp \left(-0.66\left(\log \left(x\right)-\log \left(166.1\right)\right)\right)}$	0.98	0.003 (±0.005)	6.15 (±3.6)	21.10 (±5.23)
	Root	y = 14.5+$\frac{107.6-14.5}{1+\exp \left(-1.43\left(\log \left(x\right)-\log \left(5.25\right)\right)\right)}$	0.99	–	3.73 (±0.2)	14.5 (±2.2)
Timothy	Shoot	y = −14.5+$\frac{144\mp 14.5}{1+\exp \left(-0.56\left(\log \left(x\right)-\log \left(4.6\right)\right)\right)}$	0.99	0.22 (±0.17)	2.33 (±2.11)	14.7 (±4.9)
	Root	y = −6.7+$\frac{121.7+6.7}{1+\exp \left(-1.04\left(\log \left(x\right)-\log \left(4.76\right)\right)\right)}$	0.99	0.77 (±0.3)	3.81 (±1.08)	13.9 (±5.4)
Weedy rice PI 653426	Shoot	y = −1.6+$\frac{58.9+1.6}{1+\exp \left(-1.06\left(\log \left(x\right)-\log \left(1.98\right)\right)\right)}$	0.99	0.5 (±0.16)	10.33 (±6.7)	–
	Root	y = 0.96+$\frac{80.2-0.96}{1+\exp \left(-2.35\left(\log \left(x\right)-\log \left(4.4\right)\right)\right)}$	0.99	1.85 (±0.11)	5.44 (±0.22)	–
Weedy rice PI 653431	Shoot	y = −6.45+$\frac{96.7+6.45}{1+\exp \left(-0.83\left(\log \left(x\right)-\log \left(6.2\right)\right)\right)}$	0.99	0.85 (±0.16)	7.77 (±3.1)	151.2 (±14.6)
	Root	y = 7.5+$\frac{83.2-7.5}{1+\exp \left(-2.2\left(\log \left(x\right)-\log \left(4.1\right)\right)\right)}$	0.99	0.89 (±0.11)	4.56 (±0.21)	–
Barnyard grass	Shoot	y = 3.3+$\frac{94.7-3.3}{1+\exp \left(-2.2\left(\log \left(x\right)-\log \left(2.7\right)\right)\right)}$	0.99	0.87 (±0.6)	2.77 (0.46)	10.04 (±8.05)
	Root	y = 2.95+$\frac{96.3-2.95}{1+\exp \left(-2.1\left(\log \left(x\right)-\log \left(2.4\right)\right)\right)}$	0.99	0.73 (±0.42)	2.43 (±0.28)	8.42 (±4.5)
Red sprangletop	Shoot	y = −2.7+$\frac{93.9+2.7}{1+\exp \left(-1.07\left(\log \left(x\right)-\log \left(2.2\right)\right)\right)}$	0.99	0.39 (±0.09)	2.64 (±0.32)	42.7 (±8.7)
	Root	y = −5.3+$\frac{90.3+5.3}{1+\exp \left(-1.4\left(\log \left(x\right)-\log \left(1.35\right)\right)\right)}$	0.99	0.42 (±0.17)	1.69 (±0.35)	77.9 (±8.0)

^a Using the best‐fit equation based on the F‐test, the ED₁₀, ED₅₀ and ED₉₀ values (Concentrations in μM of each allelochemical required for 10, 50, and 90% inhibition of shoot and root growth of tested seedlings) were determined. Abbreviation: SE, standard error. Absence of some ED₁₀ and ED₉₀ values indicates that these values could not be derived based on the four‐parameter log‐logistic model.