Table 1.

Analysis of Variance for IT-MS and TOF-MS Data

	n	df	variance	percent	mean variance	F value
IT-MS
grand means residuals (G)			87.890
between years (Y)	2	1	19.613	22.3%	19.6130	4312.30
between farming modes (M)	2	1	4.597	5.2%	4.5970	1010.74
between harvests (H)	3	2	3.697	4.2%	1.8485	406.43
between runs (R)	5	4	2.602	3.0%	0.6505	143.03
between Y × M × H × R	10	8	54.924	62.5%	6.8655	1509.52
within Y × M ×H × R (i.e. biological)		540	2.456	2.8%	0.0045
			87.889	100.0%
TOF-MS
grand means residuals (G)			3.686
between years (Y)	2	1	0.384	10.4%	0.3840	407.92
between farming modes (M)	2	1	0.200	5.4%	0.2000	212.46
between harvests (H)	3	2	0.844	22.9%	0.4220	448.29
between runs (R)	3	2	0.023	0.6%	0.0115	12.22
between Y × M × H × R	10	4	1.929	52.3%	0.4823	512.29
within Y × M ×H × R (i.e. biological)		324	0.305	8.3%	0.0009
			3.685	100.0%