Table 1. Regression of weather variables against dry matter yield of sorghum-sudangrass hybrid

Weather variables	Estimate	p-value	Variance inflation factor
Constant	2,200.65	0.28
Growing degree days	13.72	< 0.01	3.62
Rainfall amount	−7.49	< 0.01	1.88
Sunshine duration	−16.82	< 0.01	4.53