Table 1.

Mean tree growth responses*

Treatment	Trunk diameter (cm)				Height (m)				Annual shoot growth (m)
	1986	1987	1988	86-88	1986	1987	1988	86-88	1986	1987	1988	86-88
Auger	26.31	28.78	30.73	4.42	11.25	11.68	11.35	0.10	1.19	0.82	1.21	2.03
Auger + backfill	27.38	30.84	33.58	6.20	11.19	11.88	12.00	0.81	1.42	0.88	1.39	2.27
Water jet	29.74	34.21	37.29	7.55	12.14	12.22	12.00	0.00	1.31	0.97	1.26	2.23
PVC + gravel	28.42	32.84	36.22	7.80	11.95	12.65	12.57	0.62	1.43	0.96	1.57	2.53
Control	28.50	31.72	34.29	5.79	11.81	12.03	12.02	0.21	1.12	0.90	1.20	2.10