Table 2.

Mean height increase (cm) and percentage growth differential in roadside soil compared to peat for Acer platanoides, Aesculus hippocastanum and Betula pendula, 1992 and 1993.

	Year	Height increase
	Year	Peat	Roadside soil	Percent^¹
A. platanoides	1992	129.6 a^²	21.6 b	83.3 a
A. platanoides	1993	123.3 a	43.0 a	65.1 b
A. hippocastanum	1992	26.2 b	16.7 a	36.3 b
A. hippocastanum	1993	31.6 a	17.4 a	44.9 a
B. pendula	1992	101.6 b	60.9 b	40.1 a
B. pendula	1993	140.7 a	97.6 a	30.6 b
Mean		88.9	31.6	64.4

↵1 Growth differential (%) in roadside soil compared to peat.
↵2 Values followed by the same letter within a species and column are not significantly different at P = 0.05 according to Ryan-Einot-Gabriel-Welsh (REGWQ) multiple-range test.