Table 4. The effective climate variables on dry matter yield of whole crop maize by stepwise selection of multiple regression modeling

Parameters	Estimate	p-value	Correlation coefficient		Variance inflation factor
			Pearson’s	Partial
Constant	42,557.10	< 0.01
Seeding-silking growing degree days	17.75	< 0.01	0.07	0.36	2.46
Seeding-silking high temperature	−1,713.01	< 0.01	−0.07	−0.28	3.15
Seeding-silking soil surface temperature	1,533.25	< 0.01	0.11	0.27	3.06
Seeding-silking rainfall amount	6.95	< 0.01	−0.10	0.12	2.36
Seeding-silking wind speed	−4,136.70	0.03	0.02	−0.23	2.47
Seeding-silking sunshine duration	42.49	< 0.01	0.18	0.23	1.98
Silking-harvesting growing degree days	12.35	< 0.01	0.18	0.31	2.08
Silking-harvesting soil surface temperature	1,101.47	< 0.01	0.01	0.23	2.15
Silking-harvesting rainfall amount	−1.57	0.02	−0.10	−0.08	1.13