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Evaluating Compost from Digestate as a Peat Substitute in Nursery for Olive and Hazelnut Trees

Author

Listed:
  • Roberto Calisti

    (Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy)

  • Luca Regni

    (Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy)

  • Daniela Pezzolla

    (Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Mirko Cucina

    (National Research Council of Italy, Institute for Agriculture and Forestry Systems in the Mediterranean (CNR-ISAFOM), Via Madonna Alta 128, 06135 Perugia, Italy)

  • Giovanni Gigliotti

    (Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy)

  • Primo Proietti

    (Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy)

Abstract

This study deals jointly with three aspects of environmental, agricultural and energy sustainability: (a) Biogas is a booming energy source worldwide, resulting in an increasing production of digestate, its main by-product; (b) The extraction of peat, mainly used for nursery substrates, is being banned due to the destruction of natural habitats and release of GHGs; (c) Compost can represent a replacement of peat and contributes to the containment of GHGs. This study has verified how a compost obtained from digestate can be used as a substitute for peat in the nursery sector. While previous studies have evaluated compost use on just one species at a time, this study compared the same compost on two very different species: olive tree and hazelnut tree, both with growing interest for new tree plantings. Two concentrations of compost in the potting substrate of nursery seedlings were evaluated: 30% and 45% by weight, measuring the effect on some growth parameters during the growing season. The trials showed responses positive for olive and substantially negative for hazelnut: olive trees manifested better growth parameters with 45% compost, as opposed to hazelnut, where the addition of 45% compost worsened all growth parameters. A general conclusion can be drawn: in the nursery sector, compost can be used to replace peat, but this replacement can almost never be 100 percent, having instead to calibrate the percentage of replacement according to the characteristics of the compost and the individual edaphic needs of the plant species.

Suggested Citation

  • Roberto Calisti & Luca Regni & Daniela Pezzolla & Mirko Cucina & Giovanni Gigliotti & Primo Proietti, 2022. "Evaluating Compost from Digestate as a Peat Substitute in Nursery for Olive and Hazelnut Trees," Sustainability, MDPI, vol. 15(1), pages 1-17, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:282-:d:1013621
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    References listed on IDEAS

    as
    1. Boldrin, Alessio & Hartling, Karin R. & Laugen, Maria & Christensen, Thomas H., 2010. "Environmental inventory modelling of the use of compost and peat in growth media preparation," Resources, Conservation & Recycling, Elsevier, vol. 54(12), pages 1250-1260.
    2. Lu Zhang & Xiangyang Sun & Yun Tian & Xiaoqiang Gong, 2013. "Composted Green Waste as a Substitute for Peat in Growth Media: Effects on Growth and Nutrition of Calathea insignis," PLOS ONE, Public Library of Science, vol. 8(10), pages 1-18, October.
    3. World Commission on Environment and Development,, 1987. "Our Common Future," OUP Catalogue, Oxford University Press, number 9780192820808.
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