Table 3.

Three-way ANOVA of the effects of seed position (P), duration (D), amount of litter (L), and their interaction on seed viability of Setaria glauca in the field.

Source of variation	df	Mean square	F	P
Position (P)	1	4.279	42.054	<0.001
Duration (D)	2	8.950	87.963	<0.001
Litter amount (L)	3	0.581	5.708	0.001
P × D	2	0.647	6.363	0.003
P × L	3	0.520	5.113	0.003
D × L	6	0.157	1.542	0.173
P × D × L	6	0.100	0.985	0.440