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

2006 ◽  
Vol 110 (2) ◽  
pp. 119-128 ◽  
Author(s):  
Jun Gu Lee ◽  
Byoung Yil Lee ◽  
Hee Jae Lee
Keyword(s):  
Organic Acids ◽  
Nutrient Solution ◽  
Lactuca Sativa ◽  
Lactuca Sativa L ◽  
Hydroponic Cultivation

scholarly journals 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

2014 ◽  
Vol 21 (3) ◽  
pp. 529-537 ◽  
Author(s):  
Tomasz Kleiber
Keyword(s):  
Nutrient Solution ◽  
Significant Influence ◽  
Lactuca Sativa ◽  
Closed System ◽  
Sodium Content ◽  
Manganese Concentration ◽  
Nutrient Contents ◽  
Lactuca Sativa L ◽  
Hydroponic Cultivation ◽  
Manganese Nutrition

Abstract The aim of conducted studies was estimation of increase manganese nutrition on content of nutrient and yielding of lettuce (Lactuca sativa L.) in hydroponic cultivation. Plants were grown in rockwool using closed system fertigation with recirculation of nutrient solution. In experiment were used nutrient solution with following nutrient contents [mg·dm-3]: N-NH4 < 10, N-NO3 150, P-PO4 50, K 150, Ca 150, Mg 50, Fe 3.00, Zn 0.44, Cu 0.03, B 0.011, pH 5.50, EC 1.8 mS·cm-1. It was studied the following manganese concentrations in nutrient solution (in [mg・dm-3]): 0.5, 4.8, 9.6, 19.2 (described as Mn-I, Mn-II, Mn-III and Mn-IV). It was found a significant influence of increasing manganese concentration applied in fertigation on the content of: N, K (for Mn-IV); P, Fe, Cu (for Mn-III and Mn-IV); Mg, Zn (for Mn-II to Mn-IV) in aboveground parts of lettuce. It was no differences in case of calcium and sodium content. Increasing concentration of manganese used to fertigation significantly influenced the content of Mn in plants. Manganese also affected on the SPAD measurement (decreasing at Mn-IV) and yielding of the plants (decreasing for Mn-II to Mn-IV comparing with Mn-I).

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

2018 ◽  
Vol 12 (04) ◽  
pp. 572-582 ◽  
Author(s):  
Antonio Fernandes Monteiro Filho ◽  
◽  
Carlos Alberto Vieira de Azevedo ◽  
Márcia Rejane de Queiroz Almeida Azevedo ◽  
Josely Dantas Fernandes ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
Lactuca Sativa L ◽  
Hydroponic Cultivation ◽  
Nutrient Solutions

scholarly journals CULTIVO DE ALFACE SOB INTERVALOS DE RECIRCULAÇÕES DAS SOLUÇÕES NUTRITIVAS EM SISTEMAS HIDROPÔNICOS USANDO ÁGUA SALOBRA

Irriga ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 67-96
Author(s):  
Fabio Tayrone Oliveira de Freitas ◽  
Tales Miler Soares ◽  
Mairton Gomes da Silva ◽  
Maria Raphaela Severo Rafael
Keyword(s):  
Nutrient Solution ◽  
Lactuca Sativa ◽  
Brackish Water ◽  
Block Design ◽  
Solution Temperature ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Nutrient Film Technique ◽  
Hydroponic Systems ◽  
E Mail

CULTIVO DE ALFACE SOB INTERVALOS DE RECIRCULAÇÕES DAS SOLUÇÕES NUTRITIVAS EM SISTEMAS HIDROPÔNICOS USANDO ÁGUA SALOBRA     FABIO TAYRONE OLIVEIRA DE FREITAS1; TALES MILER SOARES1; MAIRTON GOMES DA SILVA1 E MARIA RAPHAELA SEVERO RAFAEL2   1 Programa de Pós-Graduação em Engenharia Agrícola, Núcleo de Engenharia de Água e Solo, Universidade Federal do Recôncavo da Bahia-UFRB, Rua Rui Barbosa, 710 - Campus Universitário, CEP: 44380-000, Cruz das Almas-BA, Brasil. E-mail: [email protected], [email protected], [email protected] 2 Programa de Pós-Graduação em Engenharia Agrícola, Universidade Federal do Vale do São Francisco-UNIVASF, Av. Antônio Carlos Magalhães, 510 Country Club, CEP: 48.902-300, Juazeiro-BA, Brasil. E-mail: [email protected]     1 RESUMO   Objetivou-se no presente estudo avaliar o crescimento e a produção da alface usando água salobra sob diferentes intervalos de recirculações das soluções nutritivas em sistemas hidropônicos. Dois experimentos foram conduzidos concomitantemente em blocos casualizados com cinco repetições. Três cultivares de alface (‘Gloriosa’, ‘Robusta’ e ‘Tainá’) foram cultivadas no mesmo canal hidropônico, sob as seguintes interações: dois sistemas hidropônicos (NFT – técnica do fluxo laminar de nutrientes e DFT – técnica do fluxo profundo, ambos em tubos de PVC) e dois níveis de condutividade elétrica da água – CEa (0,3 e 5,3 dS m–1), no Experimento I; no Experimento II, os mesmos dois níveis de CEa e três intervalos de recirculações das soluções nutritivas (0,25; 2 e 4 h), apenas no sistema DFT. No Experimento I, em geral, os sistemas hidropônicos não promoveram mudanças significativas nas variáveis de crescimento e produção das alfaces. Para o Experimento II, foi viável adotar intervalos de recirculações das soluções de até 2 h (cultivar ‘Robusta’) e 4 h (cultivares ‘Gloriosa’ e ‘Tainá’) no sistema DFT em tubos. De modo geral, apesar das reduções no crescimento e produção da alface utilizando-se água salobra (CEa 5,3 dS m–1), não houve depreciação da qualidade visual do produto para comercialização.   Palavras-chave: Lactuca sativa L., cultivo sem solo, oxigênio dissolvido, salinidade, temperatura da solução nutritiva.     FREITAS, F. T. O.; SOARES, T. M.; SILVA, M. G.; RAFAEL, M. R. S. LETTUCE CULTIVATION UNDER DIFFERENT RECIRCULATION INTERVALS OF THE NUTRIENT SOLUTION IN HYDROPONIC SYSTEMS USING BRACKISH WATER     2 ABSTRACT   This study aimed to evaluate the growth and production of lettuce using brackish water under different recirculation intervals of the nutrient solution in hydroponic systems. Two experiments were conducted concomitantly, in a randomized block design with five replicates. Three lettuce cultivars (Gloriosa, Robusta and Tainá) were grown in the same hydroponic channel, under the following interactions: between two hydroponic systems (NFT – Nutrient Film Technique and DFT – Deep Flow Technique, both in PVC tubes) and two levels of electrical conductivity of water – ECw (0.3 and 5.3 dS m–1), in Experiment I; in Experiment II, between the same two levels of ECw (0.3 and 5.3 dS m–1) and three recirculation intervals of the nutrient solution (0.25, 2 and 4 h), only in the DFT system. In Experiment I, in general, hydroponic systems caused no significant changes in the growth and production variables of lettuce. For Experiment II, it was viable to adopt recirculation intervals of the nutrient solution of up to 2 h (cultivar Robusta) and 4 h (cultivars Gloriosa and Tainá) in the DFT system in tubes. Generally, despite the reductions in growth and production of lettuce using brackish water (ECw 5.3 dS m–1), but without deleterious effects on the visual quality of the product for commercialization.   Keywords: Lactuca sativa L., soilless cultivation, dissolved oxygen, salinity, nutrient solution temperature.

scholarly journals Wpływ szczepów bakterii wyizolowanych z hydroponicznej uprawy sałaty (Lactuca sativa L.) na wzrost siewek sałaty, rosnących w obecnosci rożnych form pożywienia azotowego [Influence of bacterial strains isolated from hydroponic cultures of lettuce (Lactuca sativa L.) on the growth of lettuce seedlings growing in the presence of various forms of nitrogen nutrition]

2015 ◽  
Vol 32 (2) ◽  
pp. 195-206
Author(s):  
Z. Kobierzyńska-Gołąb
Keyword(s):  
Ammonium Nitrate ◽  
Nutrient Solution ◽  
Lactuca Sativa ◽  
Nitrogen Nutrition ◽  
Cultivated Plants ◽  
Bacterial Strains ◽  
Lactuca Sativa L ◽  
Hydroponic Cultures ◽  
Nutrient Solutions ◽  
Growth Of Seedlings

320 bacterial strains isolated from the surface of cultivated plants, as well as from other parts of hydroponic cultures showed stimulating (49 bacterial strains) or inhibitory (9 bacterial strains) properties in respect to the investigated plant. The following bacteria were isolated: <i>Pseudomonas, Flavobacterium, Agrobacterium, Achromobacter</i> and <i>Chromobacterium</i>. The effects of active bacterial strains on the growth of seedlings were investigated in dependence on the kind of inorganic form of nitrogen present in the nutrient solutions. The same bacterial strains exerted a stimulating effect on seedlings growing on nitrates, weaker stimulation was observed in cultures with ammonium nitrate; the growth of lettuce seedlings on nutrient solution with ammonium only, was, as a rule, inhibited by the bacteria.

scholarly journals Distinct Metabolome Changes during Seed Germination of Lettuce (Lactuca sativa L.) in Response to Thermal Stress as Revealed by Untargeted Metabolomics Analysis

2020 ◽  
Vol 21 (4) ◽  
pp. 1481 ◽  
Author(s):  
Shiwei Wei ◽  
Xiao Yang ◽  
Guotao Huo ◽  
Guojun Ge ◽  
Hongyan Liu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Thermal Stress ◽  
Seed Germination ◽  
Organic Acids ◽  
Lactuca Sativa ◽  
Sesquiterpene Lactones ◽  
Germination Percentage ◽  
Untargeted Metabolomics ◽  
Lettuce Seed ◽  
Lactuca Sativa L

Temperature strongly influences lettuce (Lactuca sativa L.) seed germination. Different lettuce genotypes respond differently to higher temperatures or thermal stress. In this study, we evaluated the germination performance of 304 lettuce accessions incubated at three temperature settings, 21 °C, 28 °C and 35 °C, respectively, for 40 h. At 21 °C, seeds of all 304 accessions germinated with very well an average germination percentage of 87.72%; at 28 °C, the average germination percentage dropped to 42.84% and at 35 °C, the germination decreased to 1.01%. Then, we investigated changes in metabolic profiles of lettuce seed response to thermal stress using an untargeted metabolomics approach. Results suggested that seeds of thermal-sensitive and thermal-tolerant cultivars employed different metabolic strategies in response to thermal stress during germination. Thermal-sensitive buds accumulated more significant amounts of organic acids, amino acids, sugars, sterols, phenolic compounds and terpenoids compared to thermal-tolerant buds at 21 °C. Thermal-tolerant lettuce cultivar accumulated higher concentrations of amino acids, organic acids, sugars, sesquiterpene lactones, sterols, and fatty acids derivatives during the germination at 35 °C compared to germinated at 21 °C. This investigation paves the way to link the metabolomics to other external and internal factors affecting lettuce seed germination under thermal stress.

scholarly journals CRESCIMENTO E COMPOSIÇÃO MINERAL DA ALFACE NO SISTEMA HIDROPÔNICO POR CAPILARIDADE

Irriga ◽  
2005 ◽  
Vol 10 (2) ◽  
pp. 146-154 ◽  
Author(s):  
Joseane Oliveira da Silva ◽  
Pahlevi Augusto de Souza ◽  
Júlio Gomes Júnior ◽  
Paulo Roberto G. Pereira ◽  
Felizardo Adenilson Rocha
Keyword(s):  
Mineral Composition ◽  
Lactuca Sativa ◽  
Dry Matter ◽  
Leaf Number ◽  
Hydroponic System ◽  
Artificial Aeration ◽  
Lactuca Sativa L ◽  
Hydroponic Cultivation ◽  
Grand Rapids ◽  
Root Size

CRESCIMENTO E COMPOSIÇÃO MINERAL DA ALFACE NO SISTEMA HIDROPÔNICO POR CAPILARIDADE  Joseane Oliveira da Silva1; Pahlevi Augusto de Souza2; Júlio Gomes Júnior2; Paulo Roberto G. Pereira2; Felizardo Adenilson Rocha31CCTA - Produção Vegetal, Universidade Estadual do Norte Fluminense , Campos dos Goytacazes, RJ, [email protected] de Fitotecnia, Universidade Federal de Viçosa, Viçosa, MG, 3Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Viçosa, MG,    1 RESUMO           Este trabalho avaliou o crescimento e composição mineral da Alface cv. Grand Rapids no sistema hidropônico por capilaridade. Comparou-se capilares com 1 ou 2 cordões, de diferentes composições físico-químicas, no cultivo hidropônico de alface para um experimento conduzido em casa de vegetação. Os tratamentos consistiram na adoção de dois tipos de capilares, utilizando 1 ou 2 unidades por tratamento (sem aeração), contrastando com o cultivo convencional (sistema sem capilar e aerado artificialmente - testemunha). Foram avaliados os seguintes parâmetros: altura da parte aérea, comprimento da raiz, número de folhas, volume de raiz, teores de água nas folhas, relação parte aérea/raiz, acúmulo de nitrogênio na planta, Eh, pH, condutividade elétrica, N-NO3-, N-NH4+, P, K, S e B na folha. O cultivo hidropônico convencional não diferiu do cultivo hidropônico por capilaridade quanto ao número de folhas, volume de raiz, crescimento radicular, matéria seca da parte aérea, matéria seca da folha. Os cultivos hidropônicos capilar sem arejamento e, sem capilar e sem arejamento apresentam a mesma qualidade de produção quando comparado com o sistema convencional com arejamento através de compressor, sendo este último sistema muito mais oneroso, uma vez que requer gasto de energia elétrica para bombeamento de água. UNITERMOS: Lactuca sativa L,  nutrição mineral.  SILVA, J. O.; SOUZA, P. A.; JÚNIOR, J. G.; PEREIRA, P. R. G.; ROCHA, F. A.  GROWTH AND MINERAL COMPOSITION OF LETTUCE ON CAPILLARY HYDROPONIC SYSTEM  2 ABSTRACT This study evaluated the growth and mineral composition of lettuce cv Grand Rapids in a capillary hydroponic system. An experiment, carried out in greenhouse, compared different physical and chemical composition capillary with 1 or 2 strings in a hydroponic lettuce cultivation. Treatments consisted of 2 types of capillary, using 1 or 2 units per treatment (without aeration) compared to conventional cultivation (non-capillary system with artificial aeration – control system). The following parameters were evaluated: shoot height, root length, leaf number, root size, leaf water content, shoot/root relation, nitrogen accumulation in plant, Eh, pH, electric conductivity, N-NO3-, N-NH4+, P, K, S and B in the leaf. The conventional hydroponic cultivation did not differ from the capillary hydroponic system in relation to leaf number, root size, root growth, shoot dry matter and leaf dry matter. The hydroponic cultivation without aeration and the one without aeration and capillary presented the same production quality when compared to the conventional system with artificial aeration. Thus, the latter is a more expensive system once electricity is required to operate the water pumping system. KEYWORDS: Lactuca sativa L, mineral nutrition.

scholarly journals Porównawcze badania nad występowaniem bakterii w hydroponicznych uprawach sałaty (Lactuca sativa L.) z azotanowaą i amonową formą azotu w pożywce [Comparative studies on the occurrence of bacteria in hydroponic cultures of lettuce (Lactuca sativa L.) enriched with nitrate or ammonia forms of nitrogen in the nutrient medium]

2015 ◽  
Vol 32 (2) ◽  
pp. 185-193
Author(s):  
Z. Kobierzyńska-Gołąb
Keyword(s):  
Nitrogen Metabolism ◽  
Nutrient Solution ◽  
Lactuca Sativa ◽  
Comparative Studies ◽  
Nutrient Medium ◽  
Hydroponic Culture ◽  
Lactuca Sativa L ◽  
Air Space ◽  
Hydroponic Cultures ◽  
Number Of Bacteria

The experiment demonstrated the greatest number of bacteria on the surface of roots immersed in nutrient solution, next on the epidermis of the parts of roots remaining in the air space above the nutrient solution and on the roots growing in the seed-bed; a smaller number in the seed-bed itself and the smallest number in the nutrient solution. The population of bacteria consisted of up to 90% short rod of bacilli. The total number of bacteria in hydroponic culture with ammonium was higher than in that with nitrate. As a rule the bacteria belonging to the separate physiological groups, participating in nitrogen metabolism (ammonifying, proteolytic, proteinizing, denitrifying and oligonitrophilic bacteria) appeared to be more numerus in the culture with ammonium than in that with nitrate. The growth of plants in hydroponic culture with ammonium was weaker than in that with nitrate.

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