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Liquid anaerobic digestate as sole nutrient source in soilless horticulture – or spiked with mineral nutrients for improved plant growth

Weimers, Kristina and Bergstrand, Karl-Johan and Hultberg, Malin and Asp, Håkan (2022). Liquid anaerobic digestate as sole nutrient source in soilless horticulture – or spiked with mineral nutrients for improved plant growth. Frontiers in Plant Science. 13 , 770179
[Research article]

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Abstract

Digestate from biogas production high in plant-available macro- and micro-nutrients could replace mineral fertilizer in protected (soilless) horticulture. Previous uses of digestate have shown that low concentrations of plant-available phosphorus (P) and sulfur (S) may be limiting factors for growth when using digestate as the sole fertilizer. In this study, digestate collected from a municipal biogas plant in Sweden was nitrified in a moving-bed biofilm reactor prior to its use as fertilizer. A greenhouse pot trial with pak choi grown in peat-based growing medium was established to assess the (i) macro- and micro-nutrient availability in the digestate, with particular focus on P and S and (ii) the effect of amending the digestate solution with nutrients considered to be lacking [P, S, magnesium (Mg), manganese (Mn), boron (B), and molybdenum (Mo)]. The results showed that plants fertilized with raw digestate suffered from S and B deficiency and early P deficiency. Supplementing the digestate with nutrients originating from mineral salts resulted in sufficient plant tissue concentrations of all elements except S. The marketable yield was similar to that achieved using standard mineral fertilizer and the dry matter yield was 17% higher. In the light of the present results, the use of nitrified digestate in soilless plant production seems like a fruitful way forward to recycle organic nutrients from waste streams. In the case where a strict organic protocol is not needed, amendment with inorganic nutrients may be a way to increase the utilization of organically derived nutrients.

Authors/Creators:Weimers, Kristina and Bergstrand, Karl-Johan and Hultberg, Malin and Asp, Håkan
Title:Liquid anaerobic digestate as sole nutrient source in soilless horticulture – or spiked with mineral nutrients for improved plant growth
Series Name/Journal:Frontiers in Plant Science
Year of publishing :2022
Volume:13
Article number:770179
Number of Pages:13
Associated Programs and Other Stakeholders:Z - SLU - Library > Odla mera
ISSN:1664-462X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Horticulture
Keywords:bio-based society, biogas residues, hydroponics, nutrient solution, organic fertilizer, phosphorus, sulfur
URN:NBN:urn:nbn:se:slu:epsilon-p-116445
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116445
Additional ID:
Type of IDID
DOI10.3389/fpls.2022.770179
Web of Science (WoS)000781300300001
Scopus2-s2.0-85128181677
ID Code:28119
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Biosystems and Technology (from 130101)
Deposited By: SLUpub Connector
Deposited On:30 May 2022 12:25
Metadata Last Modified:31 May 2022 04:00

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