Table 3.

Correlations between parameters describing root development in a split-root system with half the root system supplied with no N (NN) and the other half with high N (HN)

Parameter 1	Parameter 2	rs	Significance
Slope 1	DW total plant	-0.76	*
Slope 1	DW roots	-0.67	*
Slope 1	DW shoot	-0.60	(*)
Slope 1	FW shoot	-0.71	*
Reached 50% HN	DW shoot	0.89	*
Slope lat HN	DW roots HN	-0.89	*

DW, dry weight; FW, fresh weight; ‘Reached 50% HN’, time point at which 50% of all laterals were formed in the high N compartment; ‘Slope lat HN’, acceleration of elongation of laterals in the high N compartment. If not indicated otherwise, no N and high N root parameters were taken together. Spearman’s rank correlation coefficient (r_s) indicates statistical dependence (n=6−9; (paired t-test: ***, P<0.001; **, P<0.01; *, P<0.05; (*), P<0.1; NS, P<1.0). See Fig. 3 for model estimated parameters.