Table 1 The concentrations of REEs, Ca, Mg, Fe, and al in the soil solution with Ce and Y treatments in the high clay and low clay soils at plant harvest. Values represent the mean ± standard deviation (n = 4). Columns followed by different letters are significantly different at 5% level according to the least significant difference post hoc test.

High clay soil

0 (control)

0.63 ± 0.03 e

115 ± 26.1 ab

24.4 ± 6.11 c

0.07 ± 0.03 d

0.38 ± 0.01 bc

25

4.09 ± 0.80 d

84.7 ± 11.7 b

17.7 ± 3.09 c

0.19 ± 0.08 cd

0.48 ± 0.06 bc

50

12.1 ± 6.41 d

90.6 ± 24.8 b

24.7 ± 7.09 c

0.06 ± 0.01 d

0.51 ± 0.15 bc

100

93.1 ± 57.9 c

141 ± 54.0 ab

31.5 ± 9.60 bc

0.11 ± 0.03 cd

0.33 ± 0.01 c

Low clay soil

0 (control)

0.58 ± 0.55 e

126 ± 62.6 ab

18.7 ± 8.02 c

0.15 ± 0.12 cd

1.31 ± 0.03 b

25

756 ± 625 b

148 ± 47.6 ab

66.2 ± 38.3 ab

0.68 ± 0.45 b

4.71 ± 2.57 a

50

3020 ± 1900 a

176 ± 69.5 a

74.5 ± 20.8 a

1.98 ± 0.01 a

7.70 ± 4.30 a

100

4820 ± 3960 a

168 ± 100 ab

84.5 ± 45.9 a

0.45 ± 0.29 bc

6.27 ± 4.20 a

High clay soil

0 (control)

0.75 ± 0.16 e

115 ± 26.1 bc

24.4 ± 6.11 de

0.07 ± 0.03 d

0.38 ± 0.01 c

25

8.50 ± 2.70 d

101 ± 29.1 c

26.8 ± 4.78 cde

0.12 ± 0.05 cd

0.44 ± 0.07 c

50

84.2 ± 20.9 c

185 ± 57.3 ab

47.5 ± 9.34 bc

0.31 ± 0.22 bcd

0.65 ± 0.13 c

100

211 ± 152 c

194 ± 73.6 ab

46.3 ± 17.7 bcd

0.16 ± 0.12 cd

0.37 ± 0.01 c

Low clay soil

0 (control)

0.81 ± 0.60 e

126 ± 62.6 bc

18.7 ± 8.02 e

0.15 ± 0.12 cd

1.31 ± 0.03 c

25

1700 ± 1190 b

177 ± 47.1 ab

62.8 ± 27.5 b

0.38 ± 0.13 bc

5.96 ± 4.50 b

50

3050 ± 1820 b

225 ± 66.7 a

73.2 ± 5.97 b

0.49 ± 0.31 b

6.36 ± 0.75 ab

100

16,200 ± 12,200 a

254 ± 37.6 a

190 ± 86.7 a

1.16 ± 0.51 a

12.2 ± 8.31 a