Growing halophytes floating at sea

Radulovich, Ricardo; Rodrí­guez, Marí­a José; Mata, Rebeca

doi:10.1016/j.aqrep.2017.07.002

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Therefore, the reduction of plant biomass observed after Day 141 (April 24, 2013) in all treatments was likely due to excessive salt buildup in the root zone inhibiting plant nutrient uptake and growth. A major constraint to the cultivation of halophytes is that irrigating with seawater leads to the accumulation of salt in the soil (Brown et al ; Brown and Glenn ; Radulovich et al ). In the present study, salt buildup and growth inhibition were mitigated at the higher LF of 40% and 50%.…”

Section: Discussionmentioning

confidence: 99%

“…When halophytes are irrigated with high‐salinity water, inadequate irrigation can lead to a buildup of salts in the substrate, which inhibit plant growth, while excessive irrigation can result in inefficient absorption of nutrients by the plant‐substrate (p‐s) system and poor removal efficiency (Brown et al ; Brown and Glenn ; Radulovich et al ). Leachate fraction (LF% = leachate volume (L)/total irrigation volume (L) × 100) is the proportion of water applied that leaches from the lysimeter after an irrigation event.…”

Section: Methodsmentioning

confidence: 99%

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Experimental Evaluation of the Halophyte, Salicornia virginica, for Biomitigation of Dissolved Nutrients in Effluent from a Recirculating Aquaculture System for Marine Finfish

Watanabe

Farnell

2017

J World Aquaculture Soc

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The ability of the halophyte, Salicornia virginica, planted in drainage lysimeters to biomitigate dissolved nutrients in effluent from a recirculating aquaculture system (RAS) for marine finfish was evaluated. Seawater effluent from a RAS producing black sea bass, Centropristis striata (filtered to reduce total suspended solids), was used as irrigant. Plant growth and dissolved N and P removal were determined as a function of leachate fraction (LF%) – that is, proportion of irrigant that leaches from the plant‐substrate lysimeter. Lysimeters were irrigated weekly to produce 30, 40, and 50% LF. A control (unplanted) lysimeter was included at the 30% LF. Plant growth was excellent in all LF% treatments until Day 141 when salt buildup in the lysimeter substrate inhibited nutrient uptake. Salt accumulation was mitigated at higher LF%, so that plant biomass and net removal (μg) of dissolved N and P by the p‐s lysimeter remained higher (P < 0.05) at the 40 and 50% than at the 30% LF. On Day 141, percent removal efficiency at the 50% LF was 79.2% for inorganic N and 73.9% for total phosphorus. Through Day 355, substrate salinity was minimized and plant biomass and nutrient removal were maximized at the 50% LF. S. virginica is an effective biofilter for dissolved nutrients in effluent from an RAS for marine finfish.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%