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Titre du document / Document title

Reconciling pH for Ammonia Biofiltration and Cucumber Yield in a Recirculating Aquaponic System with Perlite Biofilters

Auteur(s) / Author(s)

TYSON Richard V. (1) ; SIMONNE Eric H. (1) ; TREADWELL Danielle D. (1) ; WHITE James M. (2) ; SIMONNE Amarat (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, ETATS-UNIS
(2) Mid-Florida Research & Education Center, University of Florida, Apopka, FL 32703, ETATS-UNIS
(3) Family, Youth and Community Sciences Department, University of Florida, Gainesville, FL 32611, ETATS-UNIS

Résumé / Abstract

Integrating hydroponic and aquaculture systems (aquaponics) requires balanced pH for plants, fish, and nitrifying bacteria. Nitrification prevents accumulation of fish waste ammonia by converting it to NO3--N. The difference in optimum pH for hydroponic cucumber (Cucumis sativa) (5.5 to 6.0) and nitrification (7.5 to 9.0) requires reconciliation to improve systems integration and sustainability. The purpose of this investigation was to: 1) determine the ammonia biofiltration rate of a perlite trickling biofilter/root growth medium in an aquaponic system, 2) predict the relative contribution of nitrifiers and plants to ammonia biofiltration, and 3) establish the reconciling pH for ammonia biofiltration and cucumber yield in recirculating aquaponics. The biofiltration rate of total ammonia nitrogen (TAN) removal was 19,31, and 80 g·m-3·d-1 for aquaponic systems [cucumber, tilapia (Oreochromis niloticus), and nitrifying bacteria (Nitrosomonas sp. + Nitrobacter sp.)] with operating pH at 6.0, 7.0, and 8.0, respectively. With the existing aquaponic design (four plants/20 L perlite biofilter/100 L tank water), the aquaponic biofilter (with plants and nitrifiers) was three times more effective at removing TAN compared with plant uptake alone at pH 6.0. Most probable number of Nitrosomonas sp. bacteria cells sampled from biofilter cores indicated that the aquaculture control (pH 7.0) had a significantly higher (0.01% level) bacteria cell number compared with treatments containing plants in the biofilter (pH 6.0, 7.0, or 8.0). However, the highest TAN removal was with aquaponic production at pH 8.0. Thus, operating pH was more important than nitrifying bacteria population in determining the rate of ammonia biofiltration. Early marketable cucumber fruit yield decreased linearly from 1.5 to 0.7 kg/plant as pH increased from 6.0 to 8.0, but total marketable yield was not different. The reconciling pH for this system was pH 8.0, except during production for early-season cucumber market windows in which pH 7.0 would be recommended.

Revue / Journal Title

HortScience    ISSN  0018-5345   CODEN HJHSAR 

Source / Source

2008, vol. 43, no3, pp. 719-724 [6 page(s) (article)] (3/4 p.)

Langue / Language

Anglais

Editeur / Publisher

American Society for Horticultural Science, Alexandria, VA, ETATS-UNIS  (1966) (Revue)

Mots-clés anglais / English Keywords

Inorganic element

;

Macronutrient(mineral)

;

Fruit vegetable

;

Vegetables

;

Inorganic nitrogen

;

Nitrogen compounds

;

Prokaryote

;

Nitrogen cycle

;

Volcanic glass

;

Physicochemical properties

;

Microorganism

;

Vegetable crop

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Cucurbitaceae

;

Aquaponics

;

Horticulture

;

Enumeration(counting)

;

Sustainable agriculture

;

Perlite

;

Cucumber

;

Ammonia

;

Bacteria

;

Cucumis sativus

;

Aquaculture

;

Hydroponic cultivation

;

Nitrification

;

System

;

Recirculation

;

Biological treatment

;

Filtration

;

Biofilter

;

pH

;

Mots-clés français / French Keywords

Elément minéral

;

Macroélément

;

Fruit légume

;

Légume

;

Azote minéral

;

Composé de l'azote

;

Procaryote

;

Cycle azote

;

Verre volcanique

;

Propriété physicochimique

;

Microorganisme

;

Plante légumière

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Cucurbitaceae

;

Aquaponie

;

<<>>

;

Horticulture

;

Dénombrement

;

Agriculture durable

;

Perlite

;

Concombre

;

Ammoniac

;

Bactérie

;

Cucumis sativus

;

Aquiculture

;

Culture hydroponique

;

Nitrification

;

Système

;

Recirculation

;

Traitement biologique

;

Filtration

;

Biofiltre

;

pH

;

Mots-clés espagnols / Spanish Keywords

Elemento inorgánico

;

Elemento primario

;

Hortaliza de fruto

;

Hortalizas

;

Nitrógeno inorgánico

;

Compuesto nitrogenado

;

Procariota

;

Ciclo nitrógeno

;

Vidrio volcánico

;

Propiedad fisicoquímica

;

Microorganismo

;

Hortalizas (plantas)

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Cucurbitaceae

;

Acuaponía

;

Horticultura

;

Recuento

;

Agricultura sostenible

;

Perlita

;

Pepino

;

Amoníaco

;

Bacteria

;

Cucumis sativus

;

Acuicultura

;

Cultivo hidropónico

;

Nitrificación

;

Sistema

;

Recirculación

;

Tratamiento biológico

;

Filtración

;

Biofiltro

;

pH

;

Mots-clés d'auteur / Author Keywords

nitrifying bacteria

;

nitrification

;

hydroponics

;

aquaculture

;

sustainable agriculture

;

most probable number

;

Localisation / Location

INIST-CNRS, Cote INIST : 13300, 35400019597088.0190

Nº notice refdoc (ud4) : 20366299



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