The potential for biochar application in "Shatangju" (<i>Citrus reticulate</i> cv.) orchard on acid red soil: Biochar prepared from its organic waste in an orchard.

Except for available manganese, the contents of all mineral elements showed an increasing trend.

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When chemical fertilizer was applied to the red soil with biochar amendments ( Table 3 ), the pH value of the soil in the sample groups with 3%, 4%, 5% and 6% biochar showed a decreasing trend.

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