Automated system developed to control pH and concentration of nutrient solution evaluated in hydroponic lettuce production

Domingues, Diego Soares; Takahashi, Hideaki; Camara, Carlos Alberto Paulinetti da; Nixdorf, Suzana Lucy

doi:10.1016/j.compag.2012.02.006

Cited by 152 publications

(64 citation statements)

References 10 publications

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“…Conversely, rejects from Sapeaçu and Conceição do Coité, and particularly the artificially salinated water, significantly reduced SDM. These results indicate that the electrical conductivity of the nutrient solution and the water quality significantly affect lettuce yield, corroborating Blat et al (2011), Casaroli et al (2003, Domingues et al (2012), Luz et al (2006), and Seo et al (2009).…”

Section: Conceição Do Coité (T6)supporting

confidence: 81%

Production of lettuce with brackish water in NFT hydroponic system

Silva

Paz

Soares

et al. 2018

SCA

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Groundwater reserves in the semi-arid regions, which are mostly brackish, could be used to meet local water demands. Hydroponic cultivation is an alternative of rational use of water. Thus, the objective of this work was to evaluate the technical feasibility of using brackish groundwater in the semi-arid region of Bahia and Recôncavo of Bahia for hydroponic production of curly lettuce cv. 'Verônica' and purple lettuce cv. 'Quatro Estações'. The experiment was conducted in a greenhouse in the city of Cruz das Almas, Bahia State, in a randomized block experimental design, composed of seven treatments [T1-public-supply water; T2-water from the well of UFRB; T3-reject water from the well of Cruz das Almas; T4-water from the well of Sapeaçu; T5-reject water from the well of Sapeaçu; T6-reject water from the well of Conceição do Coité and T7-artificially salinated water (NaCl)] and six replicates in an experimental hydroponic structure using the nutrient film technique (NFT). The following variables were analyzed: number of leaves, shoot fresh matter, shoot length, root length, shoot dry matter, and root dry matter. Relative shoot dry matter production in curly lettuce increased by 1, 5, and 2% in the treatments T2, T3, and T4, respectively, whereas in purple lettuce, the increments were 10, 1, and 20%, respectively, for the same treatments. The use of brackish groundwater from the deep tubular wells of the Federal University of Recôncavo da Bahia and Sapeaçu and desalination reject water from the tubular well of Cruz das Almas proved to be technically feasible for hydroponic lettuce production. Key words: Hydroponics. Lactuca sativa L.. Groundwater. Water salinity. ResumoAs reservas hídricas subterrâneas existentes na região semiárida, na maioria salobras, poderiam ser utilizadas quando disponíveis para atender a demanda hídrica local. O cultivo hidropônico é uma alternativa de exploração racional de água. Com isso, o objetivo do trabalho foi avaliar a viabilidade técnica da utilização de águas subterrâneas salobras do Semiárido e do Recôncavo Baiano na produção hidropônica de alface crespa cv. Verônica e alface lisa repolhuda roxa cv. Quatro Estações. O experimento foi conduzido em casa de vegetação, no Município de Cruz das Almas, Bahia, em delineamento experimental em blocos aleatorizados, composto por sete tratamentos [T1 -água de abastecimento; T2 -água do poço da UFRB; T3 -rejeito do poço do Município de Cruz das Almas; T4 -água do

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Section: Conceição Do Coité (T6)supporting

confidence: 81%

Production of lettuce with brackish water in NFT hydroponic system

Silva

Paz

Soares

et al. 2018

SCA

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“…Mobilities of nutrients in the L system are in agreement with values reported by Domingues et al, 2012 andSamarakoon, Weerasinghe, andWeerakkody, 2006 with potassium as the most mobile nutrient.…”

Section: Resultssupporting

confidence: 90%

Lettuce Growth in Extreme Conditions

Jug

Slamic

2016

Emir. J. Food Agric

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“…The commonly used pH regulators are inorganic acids such as nitric acid (Wheeler et al, 1990;Webb, 1993;Savvas and Adamidis, 1999;Savvas et al, 2006), hydrochloric acid (Domingues et al, 2012), and sulfuric acid (Massa et al, 2011;Giuffrida and Leonardi, 2012). Addition of HNO3 provides extra N nutrient in the form of NO3 -.…”

Section: Introductionmentioning

confidence: 99%

Yield and Nutritional Quality of Water Spinach (Ipomoea aquatica) as Influenced by Hydroponic Nutrient Solutions with Different pH Adjustments

Wang¹,

Chen²,

Guo³

et al. 2017

IJAB

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It is critical to identify effective buffer chemicals which are capable of regulating the pH of nutrient solution to a desirable level for best hydroponic production of crops. Greenhouse experiments were conducted to examine the pH dynamics of nutrient solutions amended with different inorganic acids during hydroponic production and the yield and nutritional quality of the resulting crops. A typical nutrient solution (pH 8.2) was adjusted to a pH of 5.6±0.2 with 1 M HNO3, 1 M H3PO4, 1 M H2SO4, and a 3:1:1 (v/v/v) mixture of all three acids, respectively. Water spinach (Ipomoea aquatica Forsk) was hydroponically grown for 25 d in the unadjusted control and the pH-adjusted nutrient solutions. The different treatments were monitored for pH changes of the nutrient solution, and measured for shoot yield and nutritional quality of the grown water spinach. It showed that the solution pH adjustments introduced additional anions but did not significantly increase the electrical conductivity (EC). The HNO3-H3PO4-H2SO4 mixture was able to achieve an optimal solution pH ranging from 5.5 to 6.5, while any of the acids only failed to maintain the solution pH within optimal range for 48 h after each adjustment. The shoot fresh weight, dry weight, and height of water spinach grown in the mixed acids-treated solution were the greatest among the five treatments. Relative to the control, the acid mixture treatment also increased the vitamin C, soluble sugar and crude protein contents in plants. Thus, the mixed 3:1:1 (v/v/v) HNO3-H3PO4-H2SO4 is recommended for regulating the pH of nutrient solution in hydroponic production of leafy greens.

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Automated system developed to control pH and concentration of nutrient solution evaluated in hydroponic lettuce production

Cited by 152 publications

References 10 publications

Production of lettuce with brackish water in NFT hydroponic system

Production of lettuce with brackish water in NFT hydroponic system

Lettuce Growth in Extreme Conditions

Yield and Nutritional Quality of Water Spinach (Ipomoea aquatica) as Influenced by Hydroponic Nutrient Solutions with Different pH Adjustments

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