The effect of pH on phosphorus availability and speciation in an aquaponics nutrient solution
AffiliationUniv Arizona, Dept Soil Water & Environm Sci
MetadataShow full item record
PublisherELSEVIER SCI LTD
CitationThe effect of pH on phosphorus availability and speciation in an aquaponics nutrient solution 2016, 219:778 Bioresource Technology
Rights© 2016 Elsevier Ltd. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractThe interaction between the main ions in aquaponics nutrient solutions affects chemical composition and availability of nutrients, and nutrient uptake by plant roots. This study determined the effect of pH on phosphorus (P) speciation and availability in an aquaponics nutrient solution and used Visual MINTEQ to simulate P species and P activity. In both experimental and simulated results, P availability decreased with increase in pH of aquaponics nutrient solutions. According to simulations, P binds to several cations leaving less free phosphate ions available in solution. High pH values resulted in the formation of insoluble calcium phosphate species. The study also demonstrated the importance of organic matter and alkalinity in keeping free phosphate ions in solution at high pH ranges. It is recommended though that pH in aquaponics systems is maintained at a 5.5-7.2 range for optimal availability and uptake by plants. (C) 2016 Elsevier Ltd. All rights reserved.
NoteAvailable online 24 August 2016; 24 Month Embargo.
VersionFinal accepted manuscript
SponsorsNational Council for Scientific and Technological Development - Brazil [CNPq, Portuguese: Conselho Nacional de Desenvolvimento Cientifico e Tecnologico]