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Use of solid phase of digestate for production of growing horticultural substrates

Author

Listed:
  • Martin Dubský

    (Department of Breeding and Growing Technologies, Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Průhonice, Czech Republic)

  • Šárka Chaloupková

    (Department of Breeding and Growing Technologies, Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Průhonice, Czech Republic)

  • Lukáš Kaplan

    (Department of Agroenvironmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Stanislava Vondráčková

    (Department of Agroenvironmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Pavel Tlustoš

    (Department of Agroenvironmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

Solid phase of digestate (SD) of agricultural biogas plants, containing undecomposed fibrous fractions of organic matter, is usable as a constituent of growing substrates. The content of soluble salts and available nutrients is limiting for SD addition into growing substrates. For addition of SD with initial 80% moisture its content of ammonium nitrogen and available potassium is limiting. The SD with natural moistness can be used in peat based substrates up to 10% volume. The content of ammonium nitrogen during the drying of SD with the use of waste heat from biogas plants is decreased. Optimal proportion of dry SD (dSD) in peat based substrates ranged from 20 to 40% volume. Peat based substrates with 20% volume of dSD had suitable physical and chemical (e.g. content of available potassium < 300 mg/l) properties. These dSD-peat growing substrates have been successfully tested in greenhouse experiments with pot plants (Petunia, Impatiens, and Pelargonium). The addition of dSD to peat based substrates increased air capacity and decreased easily available water content. However, the basic fertilization of the dSD-peat growing substrates is necessary to optimize the content of nutrients.

Suggested Citation

  • Martin Dubský & Šárka Chaloupková & Lukáš Kaplan & Stanislava Vondráčková & Pavel Tlustoš, 2019. "Use of solid phase of digestate for production of growing horticultural substrates," Horticultural Science, Czech Academy of Agricultural Sciences, vol. 46(1), pages 34-42.
    • Handle: RePEc:caa:jnlhor:v:46:y:2019:i:1:id:221-2016-hortsci
    DOI: 10.17221/221/2016-HORTSCI
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    References listed on IDEAS

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    1. Abubaker, J. & Risberg, K. & Pell, M., 2012. "Biogas residues as fertilisers – Effects on wheat growth and soil microbial activities," Applied Energy, Elsevier, vol. 99(C), pages 126-134.
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    1. Jiří Balík & Martin Kulhánek & Jindřich Černý & Ondřej Sedlář & Pavel Suran, 2019. "Impact of organic and mineral fertilising on aluminium mobility and extractability in two temperate Cambisols," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(12), pages 581-587.

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