Table 1. The estimated parameters of the hydro and thermal time model to describe Hordeum vulgare L. seed germination under different temperatures (Ts) and water potentials (ѱs).

T	Ψ (MPa)	TTsub (θT1)	TTsupra (θT2)	θH (MPa h)	θHTT (MPa h)	Hydro time GR(g)	Thermal time GR(g)
15°C	0	768	1920	38.4	384	0.013	0.013
	-0.5	544	1360	27.2	272	0.018	0.018
	-1.0	448	1120	22.4	224	0.022	0.022
	-1.5	448	1120	22.4	224	0.022	0.022
	-2.0	96.0	240.0	4.8	48.0	0.104	0.104
20°C	0	896	2240	44.8	448	0.011	0.011
	-0.5	736	1840	36.8	368	0.014	0.014
	-1.0	640	1600	32.0	320	0.016	0.016
	-1.5	448	1120	22.4	224	0.022	0.022
	-2.0	128	320.0	6.40	64.0	0.078	0.078
25°C	0	640	1600	32.0	320	0.016	0.016
	-0.5	448	1120	22.4	224	0.022	0.022
	-1.0	320	800.0	16.0	160	0.031	0.031
	-1.5	320	800.0	16.0	160	0.031	0.031
	-2.0	96.0	240.0	4.80	48.0	0.104	0.104
30°C	0	576	1440	28.8	288	0.017	0.017
	-0.5	448	1120	22.4	224	0.022	0.022
	-1.0	352	880.0	17.6	176	0.028	0.028
	-1.5	224	560.0	11.2	112	0.045	0.045
	-2.0	96.0	240.0	4.80	48.0	0.104	0.104
35°C	0	256	640.0	12.8	128	0.039	0.039
	-0.5	416	1040	20.8	208	0.024	0.024
	-1.0	320	800.0	16.0	160	0.031	0.031
	-1.5	320	800.0	16.0	160	0.031	0.031
	-2.0	96.0	240.0	4.80	48.0	0.104	0.104
40°C	0	224	560.0	11.2	112	0.045	0.045
	-0.5	96.0	240.0	4.80	48.0	0.104	0.104
	-1.0	96.0	240.0	4.80	48.0	0.104	0.104
	-1.5	64.0	160.0	3.20	32.0	0.156	0.156
	-2.0	32.0	80.0	1.60	16.0	0.313	0.313

Temperatures (T); Water potential (ψ); Thermal time constant at sub-optimal temperature (TTsub); Thermal time constant at supra-optimal temperature (TTsupra); Hydrotime constant (θH); Hydrothermal time constant (θHTT); Germination rate (GR).