Table 1.

Harvest yield, unit weight, percentage of dry matter, and plant nutrient concentrations presented as average ± standard deviation (n = 3 plots per system and year). p(system) and p(year) are p values of the two-way ANOVA with system (C, O1, O2) and year (2007 and 2008) as factors (n = 6 per system or n = 9 per year). Where p(system) <0.05, systems not sharing a common superscript row-wise are significantly different (Student’s t test, n = 3 per system) for that year

	Year	System			p(system)	p(year)
		C	O1	O2
Yield (1,000 kg FW/ha)	2007	87.2 ± 7.6a	67.6 ± 8.3b	72.5 ± 9.3ab	0.0023	1.3 × 10−5
	2008	105.3 ± 1.2a	92.0 ± 2.5b	93.5 ± 9.7ab
Unit weight (g FW)	2007	3213 ± 325a	2755 ± 147b	2783 ± 225b	0.00077	5.2 × 10−7
	2008	3969 ± 104a	3614 ± 28b	3409 ± 152b
DM (%)	2007	9.61 ± 0.38	9.42 ± 0.26	9.79 ± 0.14	NS	NS
	2008	9.56 ± 0.17	9.76 ± 0.39	9.73 ± 0.24
N (%)	2007	1.97 ± 0.06	1.97 ± 0.03	2.04 ± 0.07	NS	3.8 × 10−7
	2008	1.76 ± 0.06	1.65 ± 0.11	1.62 ± 0.01
P (%)	2007	0.29 ± 0.02	0.28 ± 0.01	0.29 ± 0.02	NS	0.0031
	2008	0.27 ± 0.01	0.26 ± 0.01	0.25 ± 0.03
K (%)	2007	2.60 ± 0.12	2.49 ± 0.19	2.62 ± 0.17	NS	0.0072
	2008	2.35 ± 0.08	2.26 ± 0.11	2.05 ± 0.49
S (%)	2007	0.63 ± 0.02	0.63 ± 0.03	0.60 ± 0.03	NS	NS
	2008	0.62 ± 0.03	0.60 ± 0.03	0.56 ± 0.04
Mg (%)	2007	0.12 ± 0.00	0.12 ± 0.01	0.12 ± 0.01	NS	0.00014
	2008	0.11 ± 0.00	0.10 ± 0.01	0.10 ± 0.00

Nutrient concentrations are presented as weight−% (g/100 g DM). Some of these data have partially been presented earlier: Yield data have been published in the supporting material of [21] as averaged over two instead of three field plots and in [18] as averages over 3 years. DM (%), N (%), and S (%) have been presented in [18] as averages over 3 years

NS not significant, FW fresh weight, DM dry matter