Table 3.

Trial 2, 2003. The influence of different sugars and concentrations applied as a root drench on leaf chlorophyll and carotenoid concentrations, photosynthetic rates, and chlorophyll fluorescence of transplanted birch (Betula pendula Roth.).

Sugar	Chlorophyll concentration (μg/g fresh weight)		Carotenoid (μg/g fresh weight)		Photosynthetic rate (CO₂ pmol/m/s)		Fv/Fm
Sugar	Week 6	Week 24	Week 6	Week 24	Week 6	Week 24	Week 6	Week 24
Control	77.4	79.2	8.9	9.3	7.1	6.3	0.82	0.82
Sucrose
25 g/L	82.1^ns	83.2^ns	7.6^ns	9.3^ns	7.4^ns	7.0^ns	0.83^ns	0.83^ns
50 g/L	61.3^*	78.6^ns	5.3^*	10.2^ns	5.3^*	6.1^ns	0.66^ns	0.79^ns
70 g/L	57.0^*	80.4^ns	4.8^*	7.8^ns	5.0^*	6.8^ns	0.62^*	0.80^ns
Fructose
25 g/L	75.4^ns	70.1^ns	6.3^*	7.7^ns	7.8^ns	7.2^ns	0.79^ns	0.82^ns
50 g/L	66.8^ns	79.0^ns	6.1^*	9.2^ns	5.3^*	6.3^ns	0.81^ns	0.82^ns
70 g/L	50.2^*	78.3^ns	5.2^*	7.0^ns	5.3^*	7.2^ns	0.60^*	0.78^ns
Glucose
25 g/L	89.0^ns	82.5^ns	8.4^ns	8.7^ns	8.4^ns	6.2^ns	0.81^ns	0.81^ns
50 g/L	60.2^*	79.3^ns	5.0^*	9.9^ns	4.3^*	6.5^ns	0.67^ns	0.82^ns
70 g/L	58.1^*	84.5^ns	6.3^*	10.2^ns	5.5^ns	7.1^ns	0.70^ns	0.80^ns
LSD	14.87	17.90	2.43	2.14	1.67	2.05	0.190	0.14

All chlorophyll fluorescence values (Fv/Fm) mean of 30 leaf readings. All photosynthesis, chlorophyll, and carotenoid values are mean of two leaves on each of five trees.
LSD = least significant difference; ns = not significant;
↵* = P ≤ 0.05 (control versus sugar treatment mean within a column).