Table 2.

The number of experimental plots (crops y⁻¹), for which N balance variables were either low or high for set “value ranges” (kg N ha⁻¹)^*.

Value range (kg N ha−1)	N fertilizer		N fixed		N input		N output*,†		Biomass output*
	[0 and 2]	[30 and 345]	0	≥1	[0 and 25.5]	>25.5	0	≥1	0	≥1
Grain legume	99	0	1	98	1	98	0	99	0	99
Grain mix	36	2	0	38	0	38	0	38	0	38
Grain non-legume	393	730	1123	0	389	734	22	1097	22	1101
Forage mix	352	180	141	376	138	379	83	434	184	348
Forage non-legume	44	102	124	22	36	110	0	146	0	146
Grain legume + forage	73	1	0	74	0	74	0	74	0	74
Grain + forage legume	86	152	203	30	66	167	0	232	0	237

The sum of the number of low and high experimental plots is not consistent across N balance variables in some cases due to missing observations.

^*Zero values reported for N- and Biomass-output variables reflect the fact that there was no removal of crop material from the system.

^†Output N values do not include N losses due to leaching or denitrification, as stated in the Materials and Methods.