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Table 5 Chemical properties of soil amended with various quantities of MB for 6 weeks at 25 °C; values with differing letters within a column are significantly different; p = 0.05

From: Evaluation of the effects of mandarin (Citrus reticulate) by-products containing citric acid on immobilization of cadmium in arable soils

Addition rate

(g kg−1)

Soil pH

(1:5 with H2O)

Total nitrogen

(g kg−1)

Organic matter

(g kg−1)

Negative charge of soil

(cmolc kg−1)

C/N ratio

Available phosphorus

(mg kg−1)

Exchangeable cation (cmolc kg−1)

Ca

K

Mg

Na

0

6.82a

1.05d

11.5d

6.85d

11.0a

142a

4.70d

0.44d

0.95d

0.37c

10

4.44c

2.54c

25.2c

7.43c

9.92b

140a

5.03c

0.81c

1.17c

0.42bc

20

4.55c

5.18b

51.5b

8.70b

9.94b

137a

5.61b

1.29b

1.51b

0.46ab

40

6.35b

9.50a

97.9a

11.4a

10.3b

144a

6.14a

2.10a

2.09a

0.53a