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Farhain, Muhammad M.; Cheema, Mumtaz; Katanda, Yeukai; Nadeem, Muhammad; Javed, Bilal; Thomas, Raymond; Saha, Ratnajit; Galagedara, Lakshman
Journal of environmental management, 01/2022, Letnik: 301Journal Article
Organic waste management in environmentally sustainable way is important not only to reduce the negative impacts on ecosystems but also valorizing the waste resources. Herein we evaluated the potential of wood ash (WA) and paper sludge (PS) wastes from a pulp and paper mill as potting media and their effects on the physicochemical properties of podzolic soil. WA, PS and biochar (BC) was mixed in different combinations with a sandy loam podzolic soil. Potting media treatments included: T1–soil (negative control); T2–PromixTM (positive control); T3–50%soil+50%WA; T4–75%soil+25%WA; T5–50%soil+50%PS; T6–75%soil+25%PS; T7–75%soil+25%BC; T8–25%soil+50%WA+25%BC; T9–50%soil+25%WA+25%BC; T10–25%soil+50%PS+25%BC; T11–50%soil+25%PS+25%BC, T12– 25%soil+25%WA+25%PS+25%BC and replicated three times. Potting media treatments expressed significant (p < 0.00) effects on pH, bulk density, total porosity, field capacity, plant available water (PAW) and water retention curves. Potting media amended with WA showed high pH range (8–12) while PS amendments exhibited pH in range where most plant nutrients are available (6.5–7.5). Results depicted significantly lower bulk density, and increased total porosity and water holding capacity of potting media amended with WA and PS. BC addition further enhanced the water retention properties compared to combinations without BC. T6, T10 and T11 produced higher amounts of PAW with desired pH compared to T1 and T2. WA, PS and BC showed high potential for developing podzolic soil-based potting media, but their effects on plant growth and elemental uptake need to be investigated. •Valorization of organic waste is important to improve environmental sustainability through recycling of valuable waste.•Herein we investigated the potential applications of wood ash and paper sludge as a potting media for horticultural crops.•Wood ash and paper sludge improved the physicochemical properties of podzolic soil.•Paper sludge was more effective than wood ash in improving soil hydrological properties for better plant growth.•Furthermore, the incorporation of biochar in the potting media enhanced water holding capacity.
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