Produção e indicadores fisiológicos de alface sob hidroponia com água salina

Paulus, Dalva; Neto, Durval Dourado; Frizzone, José Antônio; Soares, Tales Miler

doi:10.1590/s0102-05362010000100006

Cited by 68 publications

(99 citation statements)

References 16 publications

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“…Studying the production of lettuce cv. Verônica in a hydroponic system using saline water, Paulus et al (2010) found SFM decrease of 7.80%. Similarly, Santos et al (2010) observed reduction of about 17.06% per unit increase in dS m -1 for the lettuce cv.…”

Section: Resultsmentioning

confidence: 96%

Lettuce growth and water consumption in NFT hydroponic system using brackish water

Soares

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe qualitative aspects of water, such as the preparation or replenishment of the nutrient solution, are critical to the success of hydroponic crops. Therefore, the aim of this study was to evaluate the behavior of "Americana" lettuce (cv. Tainá) under increasing levels of saline stress (0.2 -control, 1.2, 2.2, 3.2, 4.2 and 5.2 dS m -1 ), replenishing the evapotranspiration with brackish water in Experiment I and supply water (0.2 dS m -1 ) in Experiment II, both used in the preparation of the nutrient solution. In both experiments, the treatments were arranged in a randomized block design, with six treatments and four replicates. Shoot fresh matter, shoot dry matter and leaf area in Experiment I suffered reductions of 15.22, 12.67 and 15.6% per unit increase of EC, respectively. In Experiment II, reductions of 8.01, 6.90 and 8.14% were observed for the same variables, respectively. In Experiments I and II, linear decrease in water consumption due to the increase in salinity was observed, with reductions of 8.83 and 5.63% for each unit increase of electrical conductivity of water when the evapotranspiration was replenished using brackish and supply water, respectively.Crescimento e consumo hídrico de alface americana cultivada com águas salobras em sistema hidropônico R E S U M O Os aspectos qualitativos da água quanto ao preparo ou reposição da solução nutritiva são fundamentais para o sucesso de cultivos hidropônicos. Portanto, o objetivo do presente trabalho foi avaliar o comportamento da alface americana (cv. Tainá) sob níveis crescentes de estresse salino (0,2 -testemunha, 1,2, 2,2, 3,2, 4,2 e 5,2 dS m -1 ) com reposição da lâmina evapotranspirada usando a água salobra utilizada no preparo da solução no Experimento I ou com água de abastecimento (0,2 dS m -1 ) no Experimento II. Em ambos os experimentos os tratamentos foram distribuídos em um delineamento experimental em blocos ao acaso com seis tratamentos e com quatro repetições. As massas fresca e seca da parte aérea e a área foliar no Experimento I sofreram reduções de 15,22, 12,67 e 15,6%, por incremento unitário da condutividade elétrica, respectivamente. No Experimento II foram constatadas reduções de 8,01, 6,90 e 8,14%, para as massas fresca e seca da parte aérea e área foliar, respectivamente. Verificou-se, nos Experimentos I e II, diminuição linear do consumo hídrico em função do aumento da salinidade, com reduções percentuais de 8,83 e 5,63% por incremento unitário da condutividade elétrica da água utilizada no preparo da solução nutritiva, nas resposição com águas salobra e doce, respectivamente.

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Section: Resultsmentioning

confidence: 96%

Lettuce growth and water consumption in NFT hydroponic system using brackish water

Soares

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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“…Studies in the literature confirm that the use of brackish water is related to the crop tolerance to salt stress (SOARES et al, 2007;PAULUS et al, 2010;DIAS et al, 2011a;DIAS et al, 2011b;OLIVEIRA et al, 2011), and most of them were performed with lettuce crops (Lactuca sativa L.), which stands out in Brazil as the most produced vegetable in the hydroponic system Nutrient Film Technique (NFT) (PAULUS et al, 2012).…”

Section: Introdutionmentioning

confidence: 99%

Mineral Nutrition of Crisphead Lettuce Grown in a Hydroponic System With Brackish Water

Soares

Silva

et al. 2016

Rev. Caatinga

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-Water availability in the Brazilian semiarid is restricted and often the only water source available has high salt concentrations. Hydroponics allows using these waters for production of various crops, including vegetables, however, the water salinity can cause nutritional disorders. Thus, two experiments were conducted in a greenhouse at the Department of Agricultural Engineering of the Federal Rural University of Pernambuco, to evaluate the effects of salinity on the mineral nutrition of crisphead lettuce, cultivar Taina, in a hydroponic system (Nutrient Film Technique), using brackish water in the nutrient solution, which was prepared by adding NaCl to the local water (0.2 dS m -1 ). A randomized blocks experimental design was used in both experiments. The treatments consisted of water of different salinity levels (0.2, 1.2, 2.2, 3.2, 4.2 and 5.2 dS m -1 ) with four replications, totaling 24 plots for each experiment. The water added to compensate for the waterdepth loss due to evapotranspiration (WCET) was the brackish water of each treatment in Experiment I and the local water without modifications in Experiment II. The increase in the salinity of the water used for the nutrient solution preparation reduced the foliar phosphorus and potassium contents and increased the chloride and sodium contents, regardless of the WCET. Foliar nitrogen, calcium, magnesium and sulfur contents were not affected by increasing the water salinity used for the nutrient solution preparation.Keywords: Lactuca sativa L. Salinity. Horticulture. NUTRIÇÃO MINERAL DE ALFACE AMERICANA EM CULTIVO HIDROPÔNICO COM ÁGUAS SALOBRASResumo -No semiárido brasileiro a disponibilidade hídrica é restrita e muitas vezes a única fonte de água disponível possui altas concentrações de sais. A hidroponia permite o uso dessas águas para a produção de diversas culturas, dentre elas as hortaliças, entretanto, a salinidade pode ocasionar distúrbios nutricionais. Diante disso, foram conduzidos dois experimentos em ambiente protegido no Departamento de Engenharia Agrícola da Universidade Federal Rural de Pernambuco, objetivando-se avaliar os efeitos da salinidade sobre a nutrição mineral da alface americana cv. Tainá em sistema hidropônico Nutrient Film Technique (NFT), utilizando águas salobras no preparo da solução nutritiva, sendo essas águas obtidas pela adição de NaCl a água de abastecimento local (0,2 dS m -1 ), e a reposição da lâmina evapotranspirada realizada usando a respectiva água salobra utilizada no preparo da solução no Experimento I e, com água de abastecimento local no Experimento II. Para ambos os experimentos o delineamento experimental utilizado foi o de blocos ao acaso com seis tratamentos (0,2; 1,2; 2,2; 3,2; 4,2 e 5,2 dS m -1 ), e quatro repetições, totalizando 24 parcelas experimentais para cada experimento. O aumento da salinidade da água utilizada no preparo da solução nutritiva, independente da estratégia de reposição da lâmina evapotranspirada, proporcionou redução nos teores foliares de fósforo e potássio e aumento nos ...

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“…The solution used in hydroponic systems must have all nutrients that are essential for plant development and there may be variations in the chemical composition and concentration, depending on the crop to be cultivated. Many studies have already been conducted with hydroponic cultivation of lettuce, such as Paulus et al (2010), Paulus et al (2012), Alves et al (2011), Santos et al (2011) and Sarmento et al (2014). However, all refer to the use of mineral nutrient solutions.…”

Section: Introductionmentioning

confidence: 99%

Monitoring, calibration and maintenance of optimized nutrient solutions in curly lettuce (Lactuca sativa, L.) hydroponic cultivation

Filho¹,

Azevedo²,

Azevedo³

et al. 2018

Aust J Crop Sci

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The monitoring, calibration and maintenance of nutrient solutions are fundamental for the development of hydroponic lettuce. This study aimed to monitor temperature, electrical conductivity, hydrogen potential and consumption of nutrient solution, besides evaluating the effectiveness of the Microsoft Office Excel SOLVER tool in the calibration of different mineral and organomineral nutrient solutions in the NFT hydroponic cultivation of curly lettuce. The experiment was conducted in randomized blocks with three replicates and the treatments consisted of four mineral solutions proposed by Furlani, Bernardes, Ueda and Castellane and Araújo, besides four organomineral nutrient solutions, proposed in this research, with chemical composition similar to the previously cited ones. For 24 days, the nutrient solutions were monitored and the variations of temperature, pH, electrical conductivity (EC) and nutrient solution consumption by the crop were measured. Calibrations were made using the Microsoft Excel SOLVER tool, using as reference an EC of 1.5 dS m -1 and nutrient solution volume of 17 L. During the experiment, regardless of the nutrient solution (modified and mineral), temperature showed maximum and minimum values of 28.7 and 21.5 ºC, respectively, and pH variation was lower in the modified nutrient solutions. Water consumption was higher with the use of mineral solutions, in comparison to the organomineral solutions with the same chemical composition. The SOLVER tool was efficient and easily used in the calibration and maintenance of electrical conductivity and volume of the nutrient solutions.

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Produção e indicadores fisiológicos de alface sob hidroponia com água salina

Cited by 68 publications

References 16 publications

Lettuce growth and water consumption in NFT hydroponic system using brackish water

Lettuce growth and water consumption in NFT hydroponic system using brackish water

Mineral Nutrition of Crisphead Lettuce Grown in a Hydroponic System With Brackish Water

Monitoring, calibration and maintenance of optimized nutrient solutions in curly lettuce (Lactuca sativa, L.) hydroponic cultivation

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