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A column leaching study was carried out over a period of 77 days to determine the changes in the chemistry of an acid soil and of the corresponding leachates after the addition of an anaerobic sludge (equivalent to 69MgDWha −1 ). By the end of the experiment, the addition of the sludge to the soil had induced an increase in soil pH (from pH 3.6–4.0 to pH 4.1–4.8), in spite of the pronounced...
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