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Box plots of organic matter content, clay content, CEC, and pH buffering capacity of untreated, acid-spilled, and alkali-spilled soils. Black dots represent actual data points, whereas red dots represent the mean values. Asterisk represents the significant difference in properties before and after acid or alkali spills (p < 0.05). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
