Accumulation of phytotoxic organic acids in reused nutrient solution during hydroponic cultivation of lettuce (Lactuca sativa L.)

Lee, Jun Gu; Lee, Byoung Yil; Lee, Hee Jae

doi:10.1016/j.scienta.2006.06.013

Cited by 89 publications

(69 citation statements)

References 28 publications

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“…Although VFAs have been reported to be phytotoxic (Pang et al, 2007) and their removal was successful, EGSB reactors may not be the best post-treatment solution for sludge digestion in aquaponics. Another post-treatment might be necessary prior to plant delivery, as previous studies have reported that organic compounds in commercially available bio-hydroponic solutions generally have phytotoxic effects that lead to poor plant growth (Garland et al, 1997;Lee et al, 2006;Shinohara et al, 2011). As such, COD concentrations in effluent should be reduced for proper use in the hydroponics unit.…”

Section: Discussionmentioning

confidence: 99%

Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors

Goddek

Delaide

Joyce

et al. 2018

Aquacultural Engineering

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A B S T R A C TThere is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provide one possible solution for breaking down sludge into bioavailable nutrients that can subsequently be delivered to plants. As such, this study examines the mineralization performance of sequential UASB reactors that are designed with an expanded granular sludge bed (EGSB) and compared to standard aerobic and anaerobic batch reactors. Results of our experiments demonstrate that only chemical oxygen demand reduction is significantly different. An unexpected drop in pH of one of the three reactor systems revealed that a pH below 6 was able to significantly increase the mineralization and mobilization of nutrients. Approximately 25% of phosphorus, potassium, and calcium could also be recovered from the sludge under lower pH conditions, as compared to the mineralization performance of standard UASB reactors running at a higher pH. However, the opposite effect was observed with respect to organic sludge reduction, where diminished performance was observed in the low-pH reactor. The current study implies that anaerobic reactors operating at low pH can potentially contribute towards improved nutrient recovery in multi-loop aquaponics systems and reduction of additive agents for pH control of the hydroponic subsystem.

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Section: Discussionmentioning

confidence: 99%

Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors

Goddek

Delaide

Joyce

et al. 2018

Aquacultural Engineering

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“…It leads to resurgence of disease pest, exhaustion of soil fertility, and developing chemical interference in the rhizosphere referring allelopathy (Hegde & Miller, 1990;Komada, 1988;Takahashi, 1984;Young, 1984). Allelopathic effects from crop residues and root exudates have extensively studied in vegetable crops such as in alfalfa (Miller, 1983;Nakahisa et al, 1993Nakahisa et al, , 1994Chon et al, 2002, Chung et al, 2011, asparagus (Young, 1984;Young & Chou, 1985;Hartung et al, 1990), cucumber (Yu & Matsui, 1994, 1997, watermelon (Kushima et al, 1998;Hao et al, 2007), taro (Asao et al, 2003), strawberry (Kitazawa et al, 2005), tomato (Yu & Matsui, 1993b), lettuce (Lee et al, 2006) and so on. Therefore, growth of these plants found to be inhibited by the released allelochemicals.…”

Section: Autotoxicity From the Root Exudates Of Vegetables And Ornamementioning

confidence: 99%

Autotoxicity in Vegetables and Ornamentals and Its Control

Asao¹,

Asaduzzaman²

2012

Hydroponics - A Standard Methodology for Plant Biological Researches

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“…The NFT hydroponic system, Nutrient Film Technique or laminar flow of nutrients, has achieved highlight in lettuce production as the favorite among various available systems by the advantages of convenience and efficiency in the production in relation to soil cultivation (Ohse et al, 2001;Lee et al, 2006). In it, the nutrient solution flows over the channels of cultivation, where the roots are lodged, irrigating them and providing oxygen and nutrients to the plants (Staff, 1998), and the management of the solution is performed by monitoring pH, electrical conductivity and chemical composition of the solution.…”

Section: Introductionmentioning

confidence: 99%

Silicon in the turgidity maintenance of American lettuce

Mattiuz¹,

Filho²,

Muniz³

et al. 2015

Afr. J. Agric. Res.

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This study aimed to verify the influence of silicon application in hydroponics lettuce cv Lucy Brown, on post-harvest under refrigeration. In hydroponic production silicon was used in the doses of 0, 28, 56 and 84 mg L -1 of potassium silicate. Lettuces were harvested early in the morning and immediately transported to UNESP, campus of Jaboticabal. Upon being received at the laboratory the plants were standardized in size and appearance, removing the three older leaves. The plants were placed in polystyrene trays (Styrofoam © ) and packaged under the temperature at 8±2°C and 80 ± 3% relative humidity. The experimental design was completely randomized with three replications, and two plants per repetition. The fresh matter of shoots was analyzed together with the silicon content in the leaves, the firmness, the fresh matter loss, titratable acidity, pH and enzyme activity of polyphenoloxidize and peroxides. The evaluations were performed every four days, for a total of 16 days of storage. The concentration of 84 mg L -1 silicon increased the fresh matter of the plant at harvest and post-harvest, provided less water loss and consequently greater firmness in the leaves during the storage period for lettuce at 8±2°C for 16 days.

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Accumulation of phytotoxic organic acids in reused nutrient solution during hydroponic cultivation of lettuce (Lactuca sativa L.)

Cited by 89 publications

References 28 publications

Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors

Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors

Autotoxicity in Vegetables and Ornamentals and Its Control

Silicon in the turgidity maintenance of American lettuce

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