Shifts in leaf N:P stoichiometry during rehabilitation in highly alkaline bauxite processing residue sand.

Results also revealed highly significant ( P < 0.001) relationships between leaf N:P ratios of the study species and soil indices such as Ca ( Fig. 5a3–c3 ) and soil pH ( Table 2 ).

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An increasing trend was observed for extractable N and for extractable AEM-P a decreasing trend with rehabilitation age ( Fig. 2b–d ).

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