Table 2.

Correlation matrices of nutrient data of Malus domestica computed across two scales: dry matter content and N-P-K-Ca-Mg.

Scale	Nutrients	N	P	K	Ca	Mg
Data scaled on dry matter content (common expression)	N	1	0.023	0.068ns	0.232**	0.271**
	P		1	−0.003ns	0.138**	0.220**
	K			1	−2.38**	−0.205**
	Ca				1	0.080ns
	Mg					1
Data scaled on the sum (N + P + K + Ca + Mg)	N	1	−0.029ns	−0.591**	−0.245**	0.293**
	P		1	−0.219**	−0.003ns	0.200**
	K			1	−0.574**	−0.455**
	Ca				1	−0.017ns
	Mg					1

ns, *, **: non-significant and significant at the 0.05 and 0.01 levels, respectively.