Biochar effects on nutrients retention and release of hydroponics growth media

Article


Haraz, Mohammed Taha, Bowtell, Les and Al-Juboori, Raed. 2020. "Biochar effects on nutrients retention and release of hydroponics growth media." Journal of Agricultural Science. 12 (7). https://doi.org/10.5539/jas.v12n8p1
Article Title

Biochar effects on nutrients retention and release of hydroponics growth media

ERA Journal ID200892
Article CategoryArticle
AuthorsHaraz, Mohammed Taha (Author), Bowtell, Les (Author) and Al-Juboori, Raed (Author)
Journal TitleJournal of Agricultural Science
Journal Citation12 (7)
Number of Pages13
Year2020
PublisherCanadian Center of Science and Education
Place of PublicationCanada
ISSN1916-9752
1916-9760
Digital Object Identifier (DOI)https://doi.org/10.5539/jas.v12n8p1
Web Address (URL)http://www.ccsenet.org/journal/index.php/jas/article/view/0/43255
Abstract

Applying biochar (BC) to broad acre crops is an effective way to sequester carbon while improving soil fertility and reducing nutrient leaching. Adopting a similar approach in a hydroponic environment, BC may enhance nutrient availability and reduce natural fluctuations in the nutrient solution. This study monitored the effect of BC addition to peatmoss growth media with ratios of 0%, 5%, 25% and 50% on pH, electrical conductivity (EC) and macronutrient retention cycle over 15 days using hydroponic nutrient solution controls. Deionised water was used to measure nutrient releases in the closed loop hydroponic system, showing that biochar increased pH level in both retention and release stages. As expected, the pH increased by a maximum of 1.5 units with the highest biochar to growth media ratio due to the natural liming nature of the BC. The EC was also affected, as BC increased in the media EC reduced. With regards to retention of nutrients, BC recovered nitrate, phosphate, calcium and sulphate but did not affect magnesium. Potassium levels increased in solution with increasing BC ratio. In terms of outcomes relevant to global agriculture, the results show that the same level of production can nominally be obtained with the use of around half of the nutrients.

Keywordsbiochar, hydroponics, macronutrients, release, retention
ANZSRC Field of Research 2020410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
410605. Soil physics
Public Notes

Copyright for this article is retained by the author(s), with first publication rights granted to the journal.
This is an open-access article distributed under the terms and conditions of the Creative Commons Attribution
license (http://creativecommons.org/licenses/by/4.0/).

Byline AffiliationsSchool of Mechanical and Electrical Engineering
Aalto University, Finland
Institution of OriginUniversity of Southern Queensland
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