Deciphering the Effectiveness of Humic Substances and Biochar Modified Digestates on Soil Quality and Plant Biomass Accumulation

TitleDeciphering the Effectiveness of Humic Substances and Biochar Modified Digestates on Soil Quality and Plant Biomass Accumulation
Publication TypeJournal Article
Year of Publication2022
AuthorsHolatko J., Hammerschmiedt T., Latal O., Kintl A., Mustafa A., Baltazar T., Malicek O., Brtnicky M.
JournalAgronomy-BaselAgronomy-Basel
Volume12
Pagination12
Date PublishedJul
Type of ArticleArticle
Accession NumberWOS:000832078900001
KeywordsAgriculture, anaerobic-digestion, carbon dynamics, digestate, fertilizers, Nutrients, organic-matter, Plant Sciences, respiration, soil, soil health, sustainable agriculture, wastes
Abstract

The effective use of digestate as exogenous organic matter to enhance soil carbon sequestration depends on the balance between labile and recalcitrant organic carbon, which is influenced by the type of feedstock, the fermentation process, and the fraction (liquid, solid) of the fermented product used. In this work, in order to change the ratio of labile to stable carbon in the resulting fertiliser, the digestate was mixed with organic carbon-rich supplements: biochar and Humac (a humic acid-rich substance). The pot experiment was carried out under controlled conditions with maize (Zea mays L.) in soil amended with the digestate (D), which was incubated with Humac (H), biochar (B), or a combination of both (D + B + H) before the application. Digestate enriched with Humac showed improved short-term nutrient (carbon, phosphorus, nitrogen) transformation, as indicated by soil enzyme activity and the highest maize biomass production of. Total carbon content, C:N ratio, short-term respiration activity, and nitrification were most enhanced by digestate enriched with either biochar or combined biochar + Humac). Long-term nitrogen mineralization was mostly enhanced by digestate + Humac, as indicated by amino-acid-induced respiration and urease activity. Short-term positive effects of digestate + biochar (eventually + Humac) on catabolism were proven, whereas their long-term effects on nutrient mineralization were negative (i.e., biochar-mediated immobilization, sequestration), which should be the focus of further research in future.

Short TitleAgronomy-BaselAgronomy-Basel
Alternate JournalAgronomy-Basel
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Cited Reference Count: 69
Holatko, Jiri Hammerschmiedt, Tereza Latal, Oldrich Kintl, Antonin Mustafa, Adnan Baltazar, Tivadar Malicek, Ondrej Brtnicky, Martin
Latal, Oldrich/AAE-4267-2021; Holatko, Jiri/AAE-2975-2021; Kintl, Antonin/AAJ-3773-2021; Hammerschmiedt, Tereza/W-5891-2018
Latal, Oldrich/0000-0002-0061-6572; Holatko, Jiri/0000-0003-4156-4673; Kintl, Antonin/0000-0002-0031-083X; Hammerschmiedt, Tereza/0000-0003-1621-2019; Malicek, Ondrej/0000-0002-8791-4344
projects of Technology Agency of the Czech Republic [TH04030132]; Ministry of Agriculture of the Czech Republic [MZE-RO1218, MZE-RO1722]; Ministry of Education, Youth and Sports of the Czech Republic [FCH-S-22-8001]
The work was supported by the projects of Technology Agency of the Czech Republic TH04030132, by the Ministry of Agriculture of the Czech Republic, institutional support MZE-RO1218, MZE-RO1722, and by Ministry of Education, Youth and Sports of the Czech Republic, grant number FCH-S-22-8001.

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