Morphology and foliar chemistry of containerized Abies fraseri (Pursh) Poir. seedlings as affected by water availability and nutrition

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Table I

Statistical significance levels (ANOVA) of Fraser fir response variables after 2 y treatment with various irrigation and fertilization treatments.

Variable	Source	2007		2008

		P value	Significance	P value	Significance
RHG	Model	0.001	***	0.000	***
	IRR	0.000	***	0.000	***
	FERT	0.020	*	0.030	*
	IRR x FERT	0.579	ns	0.465	ns

SDG	Model	0.002	**	0.000	***
	IRR	0.003	**	0.000	***
	FERT	0.016	*	0.071	ns
	IRR x FERT	0.263	ns	0.908	Ns

LBD	Model	0.000	***	0.024	*
	IRR	0.000	***	0.332	ns
	FERT	0.015	*	0.042	*
	IRR x FERT	0.015	*	0.049	*

N	Model	0.0001	***	0.045	*
	IRR	0.0001	***	0.176	Ns
	FERT	0.0106	*	0.006	**
	IRR x FERT	0.3851	ns	0.444	Ns

P	Model	0.0015	*	0.079	Ns
	IRR	0.0377	*	0.942	Ns
	FERT	0.0023	*	0.251	Ns
	IRR x FERT	0.0722	ns	0.021	*

RHG: relative height growth; SDG: stem diameter growth; LBD: leader bud density. N: total nitrogen; P: total phosphorus. Significance levels are: ns= not significant, * P ≤ 0.05, ** P ≤ 0.01, *** P ≤ 0.001.