In order to explore the effects of sludge combined with peat application on the soil of the wasteland in mining areas, in this study, a total of 10 treatments were set up, including single sludge application(5%, 10%, and 15%), single peat application(5%, 10%, and 15%), sludge and peat combined application(sludge 5% + peat 10%, sludge 10% + peat 10%, and sludge 15% + peat 10%), and blank control. The effects of different sludge and peat application rates on soil organic matter, total nitrogen, available phosphorus, available potassium, pH, moisture content, polyphenol oxidase and sucrase activities in the wasteland soil were studied by planting ryegrass in pots. The results showed that compared with the control, single application of sludge, single application of peat, and combined application of sludge and peat in the soil of the wasteland in the mining area could increase the content of organic matter, total nitrogen, available phosphorus, and the activities of polyphenol oxidase and sucrase. Sludge application by 15% and peat treatment alone could significantly increase the content of available potassium in soil. Sludge application by 15%, peat application by peat alone, and sludge and peat combined treatment could significantly increase soil moisture content. The results of TOPSIS analysis showed that the comprehensive improvement effect of sludge application on the soil of mine wasteland was better than that of sludge and peat combined application. Among them, compared with the control, soil organic matter, total nitrogen, available phosphorus, available potassium, water content, polyphenol oxidase activity and sucrase activity increased by 151.10%, 495.37%, 1130.83%, 39.71%, 115.04%, 78.98%, and 109.58%, respectively, and the comprehensive effect of soil improvement on mine wasteland was better than that of other treatments. In summary, 15% of sludge alone could be recommended as a soil improvement technology for wasteland in mining areas.
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