Table 1. Means of soil temperature at planting, growing degree days at harvest, and silage corn biomass of the three maturity groups in the field trials between 1978 and 2018

Maturity	Variable
	STP (°C)		GDD (°C)		Biomass (Mg ha−1)
	N	Mean ± SE	N	Mean ± SE	N	Mean ± SE
Early	22	16.5 ± 0.9	16	1,424.4 ± 49.4	38	15.5 ± 1.0
Medium	39	16.1 ± 0.9	62	1,363.4 ± 33.7	101	17.3 ± 0.8
Late	24	15.5 ± 1.0	25	1,542.1 ± 64.8	49	16.1 ± 0.4

STP, soil temperature at planting; GDD, growing degree day; N, numbers of data.