Electrical Conductivity Effect on Growth and Mineral Composition of Lettuce Plants in Hydroponic System

Abou-Hadid, A.F.; Abd-Elmoniem, Essam; El-Shinawy, M.Z.; Abou-Elsoud, M.

doi:10.17660/actahortic.1996.434.6

Cited by 29 publications

(26 citation statements)

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“…Generally determined content of nitrogen in leaves were similar like cited in literature [7,[22][23][24] (Table 1). Lower content of that ion was also found [10] -were authors studied the EC level of nutrient solution in lettuce cultivation.…”

Section: Resultssupporting

confidence: 79%

“…In my studied it was found range between 0.65-0.82% P. Most of authors found lower content of that macroelement [10,22,23]. Higher content of phosphorus was found by authors studied the EC effect [7] and nickel nutrition [26] in lettuce cultivation. Content of potassium in leaves of lettuce were similar to described by many authors [7,[22][23][24].…”

Section: Resultsmentioning

confidence: 90%

“…Higher content of phosphorus was found by authors studied the EC effect [7] and nickel nutrition [26] in lettuce cultivation. Content of potassium in leaves of lettuce were similar to described by many authors [7,[22][23][24]. Lower content of that ion was found by in case of Ni nutrition [26] while higher in case of lettuce cultivation under the light stress [24].…”

Section: Resultsmentioning

confidence: 99%

“…Mentioned fact was a one of reason to conducted studies concentrated on the influence of salinity in plant production. In case of lettuce a lot of studies have focused on this problem [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

Kleiber

2014

Ecological Chemistry and Engineering S

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

Kleiber

2014

Ecological Chemistry and Engineering S

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“…No entanto, para esta forma de reposição (redução de 0,25 mS cm -1 na CE inicial), verificou-se bom desempenho da solução nutritiva por dois cultivos, sem a renovação da solução, enquanto que Furlani (1998) recomenda a renovação mensal da solução para o mesmo ajuste químico. Abou-Hadid et al (1996), cultivando alface em hidroponia, observaram que níveis permanentemente elevados de CE (1,8 mS cm -1 ) na solução nutritiva diminuíram a fitomassa fresca da planta.…”

Section: Tabelaunclassified

Reposição de nutrientes durante três cultivos de alface em hidroponia

et al. 2003

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pesquisa RESUMOO experimento foi realizado em estufa plástica na UFSM, de agosto a novembro/99. Avaliou-se cinco formas de reposição de nutrientes na solução nutritiva com base na condutividade elétrica (CE), no sistema 'NFT' (Nutrient Film Technique) e duas cultivares de alface: Regina e Deisy, cultivadas em bancadas de sustentação formadas por telhas de fibro-cimento revestidas com tinta betuminosa Neutrol. Foram dispostas 14 plantas por canal para cada repetição e uma cultivar em cada três canais, totalizando 84 plantas por bancada de produção. Comparou-se a eficiência de métodos de reposição de nutrientes na produção de alface, assim como a utilização da mesma solução, com reposição de nutrientes, durante três cultivos consecutivos. O delineamento experimental foi de blocos casualizados, com três repetições, em esquema fatorial 5x2. Os resultados demonstraram que o desempenho das cultivares avaliadas não foi influenciado pelos métodos de reposição de nutrientes. A ausência de reposição de nutrientes na solução nutritiva, durante um cultivo, permitiu maior produtividade da cultura, não se recomendando a reposição quando o objetivo for renovar a solução ao final do cultivo. As formas de reposição de nutrientes na solução nutritiva, durante o primeiro e segundo cultivos, não alteraram a produtividade da cultura em relação à renovação completa da solução nutritiva ao final do cultivo hidropônico. Para a reutilização de solução nutritiva, recomenda-se a reposição de nutrientes sempre que a CE diminuir 50% da inicial, possibilitando a produção por pelo menos três cultivos. Palavras-chave:Lactuca sativa L., cultivo hidropônico, solução nutritiva, condutividade elétrica. ABSTRACT Nutrient replacement during three cultivation seasons of lettuce in hydroponicsThe experiment was carried out in a plastic greenhouse of the "Universidade Federal de Santa Maria", Brazil, from August to November 1999. In the 'NFT' (Nutrient Film Technique) five nutrient replacement manners in the nutrient solution were evaluted, based on the electrical conductivity (EC) and Regina and Deisy cultivars growing in production benches made by asbestos cement tiles. In each replication were put fourteen plants and one cultivar in each three channels totalling eighty-four plants in a production bench. We compared the efficiency of nutrient replacement methods on the growth of lettuce as well as the use of the same solution with nutrient replacement during three consecutive growing seasons. The experimental design was of randomized blocks with three replications in a 5x2 factorial scheme. The performance of the cultivars was not influenced by nutrient replacement methods. The absence of nutrient replacement in the solution during one growing season provided higher yield of lettuce. The replacement is not recommended when the objective is the renovation of the solution at the end of the growing season. The nutrient replacement forms, during the first and second growing seasons, did not alter the yield when compared to the complete renewal of the so...

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Aluminum effect on starch, soluble sugar, and phytohormone in roots of Quercus serrata Thunb. seedlings

Moriyama

Tomioka

Kojima

et al. 2015

Trees

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Key message Glucose was a key substance as an energy source in the root growth promotion by Al, and ABA may relate to metabolism involved with its process. Abstract Generally, excess aluminum (Al) ions in soil solution are toxic to many cultivated plant species, but beneficial effects of Al for plant growth have been reported. Previously, we reported stimulation of root growth and nitrate reductase (NR) activity by Al. In this study, we focused on sugars, such as sucrose, glucose, and fructose, as energy sources and also signaling substances to regulate root growth. To understand the mechanism of root growth stimulation by Al, we investigated the change in concentration of sugars and phytohormones, and the activity of NR in roots using Quercus serrata seedlings. Ten-week-old Q. serrata seedlings were hydroponically cultured with nutrient solution containing 2.5 mM Al (pH 4.0) or 3.25 mM calcium (Ca) (pH 4.0) for 3 and 15 days. The growth of first lateral root and NR activity was stimulated for 3 and 15 days of Al treatment. The concentration of starch and sucrose decreased, while the concentration of glucose increased in the Al-treated roots. The concentration of abscisic acid (ABA) in Al-treated roots increased gradually throughout the experiment. From the present study, the mechanism of root growth promotion by Al involves a complex signaling network. We suggest that glucose is a key substance as an energy source and a signaling substance to promote root growth induced by Al and ABA may relate to nitrogen (N) and carbon (C) metabolism involved with the signaling network to promote root growth induced by Al.

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Electrical Conductivity Effect on Growth and Mineral Composition of Lettuce Plants in Hydroponic System

Cited by 29 publications

References 0 publications

Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

Reposição de nutrientes durante três cultivos de alface em hidroponia

Aluminum effect on starch, soluble sugar, and phytohormone in roots of Quercus serrata Thunb. seedlings

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