Table 2.

Two-way ANOVA indicating the effects of nitrogen and phosphorus treatments on arbuscular mycorrhizal fungi (AMF).

Factors	Source of variation	SS	df	MS	F
Root colonization rates	N deposition	19,287.87	2	9,643.94	712.25**
	P addition	451.99	2	226.00	16.69**
	N × P interaction	1,015.09	4	253.77	18.74**
Spore density	N deposition	6.82	2	3.41	4.64*
	P addition	1.34	2	0.67	0.91
	N × P interaction	17.92	4	4.48	6.11**

SS sum-of-squares, df degrees of freedom, MS mean square.

* P < 0.05 and ** P < 0.01, respectively.