Table 2. Permutation model of the distance-based redundancy analysis (db-RDA), considering a forward-selected environmental variable stepwise search.

Attributes	F	Pr(>F)
pH	11.3932	0.001	*
Alkaline phosphatase	9.3514	0.001	*
β-glucosidase	7.6794	0.001	*
N.inorg	5.5795	0.001	*
Ammonium (NH4+)	4.3798	0.001	*
Nitrate (NO3−)	2.7699	0.004	*
Magnesium (Mg+2)	2.6721	0.008	*
Aluminum (Al+3)	2.4734	0.011	*
POXC	2.3991	0.007	*
Potassium (K+)	1.842	0.039	*
Phosphorus (P)	1.7746	0.042	*
Acid phosphatase	1.5661	0.101
CN.inorg	1.4846	0.109
Calcium (Ca+2)	1.4161	0.109
Yield	1.291	0.159
Organic matter	1.2715	0.172

Notes.

N.inorg

inorganic nitrogen (NH⁴⁺+ NO^3-)

*

Significant values, considering p-values <0.05