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Table 6 Correlation coefficients for relationships between Cd fractions and chemical properties of soil after amendment with varying quantities of MB for 6 weeks at 25 °C; n = 12

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

Soil property

Cd fraction

F1

F2

F3

F4

F5

Soil pH

− 0.253

+ 0.434

+ 0.141

+ 0.104

+ 0.05

Negative charge

− 0.998***

+ 0.984***

+ 0.293

− 0.386

+ 0.783**

HxCO3

− 0.971***

+ 0.537*

+ 0.744**

+ 0.623*

+ 0.993***

  1. *, **, and *** denote significance at 0.01, 0.005, and 0.001 levels of probability, respectively