Table 4. Analysis of interactions between factors(treatment, dir, amount) for tree growth of Quercus variabilis.

	Source	df	Mean Square	F-value	p
Height	treatment	1	.072	414.491	.024*
	amount	1	.005	5.234	.545
	treatment×amount	1	.006	.368	.995
	dir	1	.187	14.642	.000***
	amount	1	.001	.078	.781
	dir×amount	1	.013	1.027	.313
	dir	1	.216	17.828	.000***
	treatment	1	.085	6.988	.009**
	dir×treatment	1	.012	.962	.329
RCD	treatment	1	.029	2.043	.155
	amount	1	.000	.014	.906
	treatment×amount	1	.010	.737	.392
	dir	1	.159	.008	.929
	amount	1	.000	12.088	.001**
	dir×amount	1	.006	.464	.497
	dir	1	.168	13.604	.000***
	treatment	1	.042	3.436	.066
	dir×treatment	1	.073	5.953	.016**

p<.05
p<.01
p<.001