Table 1.

Means and standard errors (SE) of cumulative area-scaled N₂O emissions (kg N₂O-N ha⁻¹) of a grass-clover – silage maize – green manure sequence.

Farming System	Grass-clover (24 Aug 2012 to 7 May 2013, 256 days)		Silage Maize (7 May 2013 to 24 Sep 2013, 140 days)		Green Manure (24 Sep 2013 to 18 Mar 2014, 175 days)		Overall (24 Aug 2012 to 18 Mar 2014, 571 days)		Annual data (18 Mar 2013 to 18 Mar 2014)
	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
BIODYN	0.30	0.04bc	2.07	0.38b	1.15	0.29bc	3.67	0.40c	3.38	0.38b
BIOORG	0.40	0.03ab	3.55	0.23ab	0.89	0.06bc	5.04	0.34bc	4.66	0.33b
CONFYM	0.49	0.02a	4.75	0.49a	2.81	0.51a	8.16	0.47a	7.68	0.48a
CONMIN	0.26	0.04c	4.22	0.85a	1.59	0.36ab	6.16	0.94ab	5.91	0.93ab
NOFERT	—a		4.17	1.03a	0.73	0.17c	—a		5.03	1.08ab
ANCOVA	F-value	p-value	F-value	p-value	F-value	p-value	F-value	p-value	F-value	p-value
(Intercept)	204.44	<0.0001	155.84	<0.0001	4.37	0.006	248.13	<0.0001	732.44	<0.0001
Clay content	16.04	0.003	1.10	0.316	9.98	0.009	1.62	0.238	4.00	0.070
Farming System	9.28a	0.005	3.38	0.049	7.70	0.003	10.68a	0.003	4.56	0.020
Contrasts	t-value	p-value	t-value	p-value	t-value	p-value	t-value	p-value	t-value	p-value
org vs. non-org	−0.96	0.333	−2.61	0.008	−4.31	<0.0001	−4.94	<0.0001	−3.95	<0.0001

^aMeasurements in NOFERT started at 14 March 2013 and thus were excluded from statistical analysis.

ANCOVA on log scaled N₂O emissions per farming system (n = 4). Letters = Post-hoc Tukey test (p < 0.05).

Contrasts: Post-hoc t-test on pairwise comparisons of org (BIODYN + BIOORG) and non-org (CONFYM + CONMIN) systems (n = 8).