Table 2.

Parameter and SSE values for the Thermal Time model.

		Parameters of calculation matrix				Model optimum
		Min	Max	Step	Number	All	Odd years	Even years
Starting date	DOY	80	120	1	41	97	82	98
Temperature sum threshold	degree-day	100	300	5	41	175	295	210
Critical temperature threshold	° C	−5	5	0.25	41	−2	−2.5	−3.5
Total parameter combinations					68921
SSE, all	degree-day²					185,318	196,881	188,079
SSE, odd years	degree-day²					86,523	80,785	96,698
SSE, even years	degree-day²					98,795	116,096	91,381
Increase in SSE	%						13.1	20.1