Table 4. Loading scores of the selected growing condition variables in the factor analysis, showing dominance of the selected variables in the field trial data collected from 1983 to 2008

Selected growing condition variable	Loading scores of factor
	Factor 1	Factor 2	Factor 3
Accumulated temperature within temperature range1)
0°C to 25°C	0.889	0.380	−0.202
5°C to 25°C	0.896	0.333	−0.246
10°C to 30°C	0.907	0.259	−0.273
Sunshine duration
Hour within 5°C to 25°C	0.030	0.561	−0.557
Duration of temperature 0°C to 25°C	0.133	0.939	0.042
Daily mean temperature > 25°C
Days > 25°C	0.942	−0.162	−0.086
Accumulated temperature > 25°C	0.937	−0.164	−0.088
January temperature
Daily low	0.518	0.486	−0.026
Precipitation
Over 0 mm per day	−0.359	−0.005	0.820
Accumulated rainfall over 0 mm	−0.080	0.012	0.750
Soil property2)
Clay content	0.310	0.171	−0.036
Drainage	0.132	0.084	0.066

Daily temperature higher than 25°C.
Jitter-transformation was applied to transform the soil characteristics into continuous variables.