Table 4. Variance analysis of the effects of block, Al, P, and clone on Al-induced secretion of organic acids from roots.

Source	df	MA		OX		CI
		MS	P	MS	P	MS	P
B	2	0.03	0.36	0.04	0.20	0.00	0.86
Al	1	28.91	<0.01**	9.39	<0.01**	0.11	<0.01**
P	2	0.90	<0.01**	0.96	<0.01**	0.02	<0.01**
C	1	6.62	<0.01**	6.89	<0.01**	0.24	<0.01**
Al*P	2	2.41	<0.01**	0.02	0.46	0.01	<0.01**
P*C	2	0.01	0.69	0.23	<0.01**	0.01	<0.01**
Al*C	1	0.19	<0.01**	0.07	0.08	0.00	0.22
Al*P*C	2	0.02	0.46	0.14	<0.01**	0.01	<0.01**
Error	22	0.02		0.02		0.00
Total	35

Note: MA, OX, and CI represent Al-induced secretion of malate, oxalate, and citrate from roots, respectively.

* Significant difference (0.01 < P < 0.05).

** Highly significant difference (P < 0.01)