Fertilizer potential of biochar and ryegrass productivity in metal-contaminated soil.

Soil pH There is a clear trend of increasing soil pH with increased biochar application rates ( Figure 2 ; Supplementary Tables S1 , S2 ).

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This interpretation gains support from a subsequent simple correlation analysis (Pearson), which reveals highly significant and negative correlations between P and K with Ca, Mg, and S in both soil and plant roots and shoots ( Supplementary Figure S1 ).

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