Table 3.

Soil P fractions come from field experiment under sequential extractions (mg·kg⁻¹).

Soil Depth	Treatment	Sol-P	Al-P	Fe-P	Red-P	Ca-P	Org-P
Surface soil	P0	0.10 ef	4.75 d	30.20 ef	16.27 cd	10.96 cd	62.48 a
	P1	0.16 def	12.00 cd	45.78 de	20.60 bc	20.86 bcd	63.82 a
	P2	0.49 bc	19.61 c	64.66 c	26.64 ab	23.53 bc	65.75 a
	P3	0.63 b	34.47 b	92.00 b	27.46 a	26.19 b	59.78 a
	P4	1.33 a	83.23 a	139.06 a	28.26 a	39.50 a	57.97 a
Subsurface soil	P0	0.07 f	2.88 d	13.39 f	11.95 d	8.20 d	39.90 b
	P1	0.15 def	7.83 d	28.71 ef	17.00 cd	9.37 d	34.04 b
	P2	0.30 cde	9.64 cd	35.73 e	21.32 bc	18.53 bcd	36.71 b
	P3	0.33 cd	11.27 cd	45.03 de	20.60 bc	17.63 bcd	31.03 b
	P4	0.32 cd	12.90 cd	53.40 cd	18.66 c	17.87 bcd	33.73 b
Source of variation
Treatment		<0.001	<0.001	<0.001	<0.001	<0.01	ns
Soil depth		<0.001	<0.001	<0.001	<0.001	<0.01	<0.001
T × S		<0.001	<0.001	<0.001	ns	ns	ns

Note: Values followed by different letters indicate significant difference (p < 0.05) between various treatment in different soil depths. “ns” in ANOVA results indicates no significant difference.