Table 1.

Canopy characteristics and N distribution parameters determined during the different experiments and N treatments studied. Parameters were obtained by fitting Eq. 1 to the N content measured in leaves separated in 10-cm strata. Standard errors are indicated in brackets.

Experiment	Nutrient solution	N acquisition mode	LAI	Nup	kN	r2
1	N+	Assimilation	5.1	2.12 (0.075)	0.23 (0.013)	0.95
1	N+	Assimilation	2.6	2.31 (0.106)	0.24 (0.020)	0.96
2	N+	Assimilation	8.1	2.59 (0.123)	0.21 (0.021)	0.96
1	N−	Assimilation	1	1.09 (0.259)	0.20 (0.088)	0.64
1	N−	Assimilation	0.7	0.76 (0.130)	0.09 (0.312)	0.20
1	N−	Assimilation + fixation	3.3	1.77 (0.134)	0.15 (0.033)	0.87
1	N−	Assimilation + fixation	2.1	1.69 (0.072)	0.29 (0.031)	0.94
3	N0	Fixation	2.0	1.71 (0.181)	0.24 (0.054)	0.75