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  4. A Low-Tech Approach to Mobilize Nutrients from Organic Residues to Produce Bioponic Stock Solutions
 
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2024
Journal Article
Title

A Low-Tech Approach to Mobilize Nutrients from Organic Residues to Produce Bioponic Stock Solutions

Abstract
Organic residues, as a nutrient source suitable of producing solutions for hydroponic crop production, have the potential to reduce the dependence on mineral fertilizers. Especially in remote and resource-constrained regions, organic residues might be the only option to produce hydroponic nutrient solutions. However, nutrient solutions made from organic residues, called bioponic solutions, are usually unbalanced in their nutrient composition, which leads to deficiencies and poor plant growth. This study aimed to experimentally develop a low-tech approach to produce bioponic stock solutions rich in NO3−, P, and K, to create a balanced bioponic solution. The mixed bioponic solution contained 58 mg L−1 NH4+-N, 43 mg L−1 NO3−-N, 50 mg L−1 PO43−-P, and 246 mg L−1 K+. This approach resulted in satisfactory levels of P, K and micronutrients. The solution was tested pure and spiked with Ca(NO3)2 on lettuce in comparison with a mineral Hoagland nutrient solution. Neither the bioponic nor the spiked bioponic solution achieved comparable lettuce yields to the Hoagland solution. The poor growth of the plants in the bioponic solution was attributed to an unfavorable NH4+:NO3− ratio, high microorganism load, and elevated pH levels. However, the approach of preparing bioponic stock solutions could be promising for future research into the production of balanced bioponic nutrient solutions from organic residues.
Author(s)
Heintze, Sebastian
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Beckett, Marc  
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Germer, Jörn U.
Universität Hohenheim
Kriem, Lukas  
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Asch, Folkard
Universität Hohenheim
Journal
Agriculture  
Open Access
File(s)
Download (2.45 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.3390/agriculture14060928
10.24406/publica-6196
Additional link
Full text
Language
English
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Keyword(s)
  • bioponics

  • hydroponics

  • organic residue reuse

  • plant nutrition

  • soilless agriculture

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