Table 2.

P values for growth and tree vitality of four tree species [Betula pendula (silver birch), Quercus rubra (red oak), Prunus avium (cherry), and Sorbus aucuparia (rowan)] following sugar treatments. P < 0.05 is considered significant.

Factor	Growth								Vitality
Factor	Leaf area	Root length	Leaf DW	Shoot DW	Root DW	Total plant DW	R:S	RGP	Fv/Fm	Pn	Chlorophyll content
Species	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.018	0.003	<0.001	<0.001
Sugar	0.038	<0.001	0.004	0.003	<0.001	<0.001	<0.001	<0.008	0.649	0.386	0.107
Species × sugar	0.688	0.625	0.151	0.312	0.016	0.103	0.271	0.402	0.505	0.445	0.098