Table 2.

Statistical significance of fertilizer, topsoil depth (TSD) and fertilizer × TSD interaction effects on crop yield, aboveground residue and cumulative greenhouse gas (GHG) emissions in 2012 growing season.

	P > F
	Grain yield	Above ground residue	CO2	N2O	CH4
Fertilizer	NS	0.0151	0.0345	<0.0001	<0.0001
Topsoil depth	<0.0001	0.0012	0.0003	<0.0001	<0.0001
Fertilizer × TSD	0.0256	NS	0.0014	<0.0001	<0.0001