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Effect of carbon-enriched digestate on the microbial soil activity

Author

Listed:
  • Jiri Holatko
  • Tereza Hammerschmiedt
  • Antonin Kintl
  • Subhan Danish
  • Petr Skarpa
  • Oldrich Latal
  • Tivadar Baltazar
  • Shah Fahad
  • Hanife Akça
  • Suleyman Taban
  • Eliska Kobzova
  • Rahul Datta
  • Ondrej Malicek
  • Ghulam Sabir Hussain
  • Martin Brtnicky

Abstract

Objectives: As a liquid organic fertilizer used in agriculture, digestate is rich in many nutrients (i.e. nitrogen, phosphorus, sulfur, calcium, potassium); their utilization may be however less efficient in soils poor in organic carbon (due to low carbon:nitrogen ratio). In order to solve the disadvantages, digestate enrichment with carbon-rich amendments biochar or humic acids (Humac) was tested. Methods: Soil variants amended with enriched digestate: digestate + biochar, digestate + Humac, and digestate + combined biochar and humic acids—were compared to control with untreated digestate in their effect on total soil carbon and nitrogen, microbial biomass carbon, soil respiration and soil enzymatic activities in a pot experiment. Yield of the test crop lettuce was also determined for all variants. Results: Soil respiration was the most significantly increased property, positively affected by digestate + Humac. Both digestate + biochar and digestate + Humac significantly increased microbial biomass carbon. Significant negative effect of digestate + biochar (compared to the control digestate) on particular enzyme activities was alleviated by the addition of humic acids. No significant differences among the tested variants were found in the above-ground and root plant biomass. Conclusions: The tested organic supplements improved the digestate effect on some determined soil properties. We deduced from the results (carbon:nitrogen ratio, microbial biomass and activity) that the assimilation of nutrients by plants increased; however, the most desired positive effect on the yield of crop biomass was not demonstrated. We assume that the digestate enrichment with organic amendments may be more beneficial in a long time-scaled trial.

Suggested Citation

  • Jiri Holatko & Tereza Hammerschmiedt & Antonin Kintl & Subhan Danish & Petr Skarpa & Oldrich Latal & Tivadar Baltazar & Shah Fahad & Hanife Akça & Suleyman Taban & Eliska Kobzova & Rahul Datta & Ondre, 2021. "Effect of carbon-enriched digestate on the microbial soil activity," PLOS ONE, Public Library of Science, vol. 16(7), pages 1-13, July.
  • Handle: RePEc:plo:pone00:0252262
    DOI: 10.1371/journal.pone.0252262
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    References listed on IDEAS

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    1. Simon Kizito & Hongzhen Luo & Jiaxin Lu & Hamidou Bah & Renjie Dong & Shubiao Wu, 2019. "Role of Nutrient-Enriched Biochar as a Soil Amendment during Maize Growth: Exploring Practical Alternatives to Recycle Agricultural Residuals and to Reduce Chemical Fertilizer Demand," Sustainability, MDPI, vol. 11(11), pages 1-22, June.
    2. Jiri Holatko & Tereza Hammerschmiedt & Rahul Datta & Tivadar Baltazar & Antonin Kintl & Oldrich Latal & Vaclav Pecina & Petr Sarec & Petr Novak & Ludmila Balakova & Subhan Danish & Muhammad Zafar-ul-H, 2020. "Humic Acid Mitigates the Negative Effects of High Rates of Biochar Application on Microbial Activity," Sustainability, MDPI, vol. 12(22), pages 1-19, November.
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