Table 5. Changes in NO₃⁻, SO₄²⁻, Cl⁻, H₂PO₄⁻, C₂O₄²⁻ contents of wild and cultivated soybean roots under control and salt stress conditions.

The values are shown as mean ± SE. Different letters (A-G and a-g) mark significantly different values at P < 0.05 according to Duncan’s method. W, wild soybean; C, cultivated soybean; CK, Control; L-NS, M-NS, and H-NS represent low (10 mmol L⁻¹), medium (20 mmol L⁻¹) and high (30 mmol L⁻¹) concentrations of saline salt stress, respectively; while L-AS, M-AS and H-AS represent low (10 mmol L ⁻¹), medium (20 mmol L⁻¹) and high (30 mmol L⁻¹) concentrations of alkaline salt stress, respectively.

Variety	Treatment	NO3−	SO42−	Cl−	H2PO4−	C2O42−
	CK	8.52 ± 0.97A	21.19 ± 0.60C	4.18 ± 0.06F	2.81 ± 0.07BC	1.07 ± 0.02D
	L-NS	8.16 ± 0.39A	22.45 ± 0.32BC	6.95 ± 0.51C	2.84 ± 0.00BC	1.17 ± 0.03D
	M-NS	7.66 ± 0.18AB	23.44 ± 0.13B	9.16 ± 0.21B	3.00 ± 0.11AB	1.21 ± 0.00CD
W soybean	H-NS	6.70 ± 0.06BC	25.49 ± 0.73A	10.34 ± 0.18A	3.18 ± 0.06A	1.18 ± 0.09D
	L-AS	7.51 ± 0.40AB	21.50 ± 0.06C	5.30 ± 0.03E	2.62 ± 0.13CD	1.41 ± 0.07C
	M-AS	6.62 ± 0.09BC	21.09 ± 0.62C	6.05 ± 0.12D	2.50 ± 0.12DE	1.63 ± 0.11B
	H-AS	5.56 ± 0.11C	19.02 ± 0.39D	6.81 ± 0.09C	2.30 ± 0.02F	1.94 ± 0.07A
	CK	7.27 ± 0.17a	22.91 ± 0.85a	5.55 ± 0.19d	2.94 ± 0.00a	1.35 ± 0.018b
	L-NS	6.46 ± 0.31b	21.91 ± 0.85ab	6.69 ± 0.04bc	2.80 ± 0.04ab	1.38 ± 0.20b
	M-NS	5.99 ± 0.02b	20.20 ± 1.50abc	7.23 ± 0.36ab	2.68 ± 0.15bc	1.42 ± 0.11b
C soybean	H-NS	5.15 ± 0.35c	18.36 ± 1.24c	7.93 ± 0.40a	2.58 ± 0.03c	1.42 ± 0.05b
	L-AS	5.88 ± 0.23b	21.70 ± 3.00ab	6.03 ± 0.41cd	2.49 ± 0.05c	1.54 ± 0.06ab
	M-AS	4.52 ± 0.26c	18.86 ± 0.74bc	6.27 ± 0.01cd	2.05 ± 0.02d	1.73 ± 0.00ab
	H-AS	3.47 ± 0.09d	17.30 ± 2.18c	6.80 ± 0.06bc	1.85 ± 0.03e	1.83 ± 0.11a