. 2017 Feb 15;239:324–333. doi: 10.1016/j.agee.2017.01.029

Table 2.

Yields, cumulative N₂O-N and CH₄-C emissions and N₂O emission factors (EF) of two cropping seasons: grass-clover (18/09/2012–22/09/2013, 369 days) and winter wheat (22/09/2013–15/07/2014, 296 days). Means (SE, n = 8 for gas data, n = 4 for yield data) are given per treatment and ANCOVA results mark significant differences between tillage and fertiliser systems.

Treatments	grass-clover ley				winter wheat
	yield	N₂O-N		CH₄-C	yield	N₂O-N		CH₄-C
	t ha⁻¹	kg ha⁻¹	EF%	kg ha⁻¹	t ha⁻¹	kg ha⁻¹	EF%	kg ha⁻¹
CT x SL	11.7 (0.4)	0.82 (0.09)	0.71^a/0.09^b	−0.14 (0.02)	4.49 (0.12)	2.07 (0.23)	1.64^a/0.24^b	−0.24 (0.04)
CT x MC	11.3 (0.7)	0.82 (0.12)	0.69/0.09	−0.12 (0.08)	4.32 (0.19)	2.96 (0.56)	1.91/0.77	−0.25 (0.06)
RT x SL	11.2 (0.2)	0.75 (0.20)	0.65/0.16	0.01 (0.10)	4.62 (0.07)	2.27 (0.24)	1.81/0.29	−0.08 (0.05)
RT x MC	10.3 (0.3)	0.89 (0.22)	0.74/0.27	−0.07 (0.03)	4.23 (0.22)	2.80 (0.24)	1.80/0.57	−0.39 (0.08)

ANCOVA (F-Statistics and significance levels)
Clay content	2.11 ^ns	9.04 ^*		15.07 ^**	47.63 ^***	2.14 ^ns		5.68 ^*
Tillage	9.08 ^*	0.02 ^ns		4.78 ^(*)	2.72 ^ns	0.82^ns		0.37 ^ns
Fertilisation	7.12 ^*	0.05 ^ns		0.01 ^ns	5.16 ^*	3.91 ^(*)		12.25 ^**
Tillage x Fertilisation	0.23 ^ns	0.14 ^ns		0.82 ^ns	0.55 ^ns	0.23 ^ns		5.31 ^*

Treatments: CT – ploughing, RT – reduced tillage, SL – slurry, MC – manure compost. ns = not significant.

^(*)p < 0.1. ^*p < 0.05. ^**p < 0.01. ^***p < 0.001.