The Effect of Ash Admixture on Compost Quality and Availability of Nutrients

Martin Dědina, Alice Jarošíková, Petr Plíva, Martin Dubský

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The effect of graded doses of ash from biomass wood chips and straw admixture combustion on compost properties was investigated through a set of large‐scale experiments. In a compost plant, matured organic composts were prepared from raw organic mixtures based on biodegradable waste, separated digestate, straw, and biomass ash admixture of 0, 3, 6, and 9 wt. %. Final composts, as well as individual components, were analyzed for basic physical and chemical properties, total and available nutrients, and potentially hazardous elements. Biomass ash addition increased the total nutrient content (P, K, Mg, Ca, and S) in the studied composts. The highest ash addition (9 wt. %) increased the nutrient content as follows: Ca (2.6×), Mg (1.6×), K (1.5×), P (1.2×), S (1.3×). However, the availability of some nutrients (especially P, K, and Mg) for plant nutrition was reduced by the increasing amount of ash admixture. Even at the highest dosage of biomass ash addition, desirable chemical (nutrient content) and physical properties of composts (especially dry bulk density) were both obtained. The content of hazardous elements was below the legal limit values in all studied composts.

Original languageEnglish
Article number1640
JournalSustainability (Switzerland)
Issue number3
StatePublished - 1 Feb 2022
Externally publishedYes


  • Biomass ash
  • CAT soluble nutrients
  • Organic compost
  • Precision fertilizing
  • Raw material composition
  • Total nutrients

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Hardware and Architecture
  • Computer Networks and Communications
  • Management, Monitoring, Policy and Law


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