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| Registros recuperados: 49 | |
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| de Carvalho, Ricardo Oliano; Machado, Miguel Borges; Scherer, Vinícius Saldanha; Fuentes, Giovani Castro; da Luz, Carlos Alberto Silveira; da Luz, Maria Laura G. Silva. |
| Lettuce is a leafy vegetable most consumed in Brazil, and is considered the basis for salads and can be grown by hydroponics system. Hydroponics is a viable alternative to be implemented, with benefits for soil conservation and preservation of water sources. This work aimed to study the market of trailers snacks in Pelotas to analyze the economic feasibility of deploying an enterprise for the production of hydroponic lettuce, minimally processed, on a farm located in the city of Pelotas. The trailers were classified as small, medium and large, according to the consumption of lettuce. From market analysis, facilities and greenhouses for hydroponics area for processing of lettuce with flowchart of activities and mass balance were designed. The lettuce is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lettuce; Hydroponic system; Production.. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3112 |
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| Amirouche, mawhoub. |
| The search for decision-making tools is essential in order to control agricultural practices and plan for sustainable agriculture that respects the environment. To this end, FAO has developed an evaluation model called AquaCrop, which covers most technical routes, including fertilization. In this perspective, this study focuses on the AquaCrop model (v6.1) to calibrate it for the simulation of lettuce crop yields (Lactuca sativa L), under different fertilization levels for the trial periods (2015/2016) and (2016/2017). Four levels of fertilization were examined under rain conditions, namely T1 (0 kg N/ha), T2 (60 kg N/ha), T3 (120 kg N/ha) and T4 (180 kg N/ha). The model performance was evaluated using the coefficient of determination (R2), the square root... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AquaCrop; Lettuce; Calibration; Validation; Fertility stress; Water productivity. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6195 |
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| Jiménez,Kenia Barrantes; McCoy,Clyde B.; Achí,Rosario. |
| A Multiplex Polymerase Chain Reaction (PCR) assay to be used as an alternative to the conventional culture method in detecting Shigella and enteroinvasive Escherichia coli (EIEC) virulence genes ipaH and ial in lettuce was developed. Efficacy and rapidity of the molecular method were determined as compared to the conventional culture. Lettuce samples were inoculated with different Shigella flexneri concentrations (from 10 CFU/ml to 10(7) CFU/ml). DNA was extracted directly from lettuce after inoculation (direct-PCR) and after an enrichment step (enrichment PCR). Multiplex PCR detection limit was 10(4) CFU/ml, diagnostic sensitivity and specificity were 100% accurate. An internal amplification control (IAC) of 100 bp was used in order to avoid false... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PCR; Shigella; Rapid method; Lettuce; Food. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000400018 |
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| Casanova P,Manuel; Messing,Ingmar; Joel,Abraham; Cañete M,Alberto. |
| This study evaluates five methods to estimate crop evapotranspiration in greenhouse conditions. It compares their performance in relation to the evapotranspiration directly determined from water balance measurements (ETlys) in an irrigated lettuce (Lactuca sativa L.) crop during 9 weeks. Daily values of the reference evapotranspiration (ETo) from Class A pan (CAP), Piche atmometers (ATM), Andersson evaporimeters (ANE), FAO-Radiation (FRE) and FAO-Penman-Monteith (PME) equations were compared. The methods showed similar temporal variations but at different ranges as follows: ANE < CAP < FRE < PME < ATM. Furthemore, ETo had a clear correlation with solar radiation. Crop coefficients (Kc = ETlys/ETo) varied somewhat amongst the methods, but trends... |
| Tipo: Journal article |
Palavras-chave: Evapotranspiration; Greenhouse; Lettuce; Lysimeter. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100008 |
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| Oberpaur,Christel; Fernández,Carolina; Délano,Guillermo; Arévalo,M.Eugenia. |
| The most frequently used substrate for the production of covered root seedlings is peat, the extraction of which is under scrutiny due to its negative environmental impact; however, the use of Sphagnum moss in adequate mixtures constitutes a possible alternative. Lettuce seeds (Lactuca sativa L.) were sown in Polystyrene trays (240 alveoli, 24 cm³) to test four substrates, 50% Sphagnum moss mixed with 50% humus or compost and 60% Sphagnum moss with 40% humus or compost, and commercial peat was used as a control. A dose (2.5 or 3.5 gL-1) of controlled-release fertilizer (CRF) was added to all substrates except for the control mix, and the substrates were subsequently irrigated with or without a fertilizer solution. The study was conducted under shaded... |
| Tipo: Journal article |
Palavras-chave: Compost; Humus; Lettuce; Slow release fertilizer; Sphagnum moss. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300004 |
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| Oberpaur,Christel; Puebla,Víctor; Vaccarezza,Flavia; Arévalo,María E. |
| Nursery producers grow plants in containers, mainly using substrates based on peat. In order to replace the use of peat, diverse mixtures of substrates combining different proportions of the moss Sphagnum magellanicum Brid. (40, 50 and 60%) and alternative organic materials, such as compost, humus and composted pine bark, were tested. In the frst trial under laboratory conditions, conducted in October 2006, the physicochemical characteristics of nine initial mixtures, including a control, were determined. Five mixtures, with similar physicochemical conditions as the control, and a commercial peat mixture, were selected by the application of Euclidean minimum distances. The fnally selected mixtures were three combinations of moss with composted pine bark... |
| Tipo: Journal article |
Palavras-chave: Compost; Composted pine bark; Humus; Lactuca sativa; Lettuce; Moss; Sphagnum. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100012 |
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| Molina-Montenegro,Marco A; Zurita-Silva,Andrés; Oses,Rómulo. |
| Water is essential for plants, affecting the majority of the physiological processes related to growth and productivity. Water shortage is one of the most common factors that limit crop productivity worldwide. Many cultivars have elevated water requirements, nevertheless in some countries due to global climate change effects, the availability of water for irrigation is becoming limited. In fact, current models of climate changes predict that central Chile will be a sensitive zone where precipitation will drastically decrease. In this study, the variation of gas exchange and production of fresh biomass in a lettuce cultivar, grown under different water availability regimes, was evaluated. Additionally, the concentration of total soluble sugar and water use... |
| Tipo: Journal article |
Palavras-chave: Soluble sugars; Water use efficiency; Water shortage; Lettuce; Photosynthetic rate. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100006 |
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| CAXAMBÚ,Sabrina; BIONDO,Elaine; KOLCHINSKI,Eliane Maria; PADILHA,Rosiele Lappe; BRANDELLI,Adriano; SANT’ANNA,Voltaire. |
| Abstract Pecan nutshell is a residue from food industry that has potential to be used as biopreservative in foods. The objective of this study was to evaluate the antimicrobial activity of pecan nutshell aqueous extract in vitro and its effectiveness to inhibit spoilage microorganisms on lettuce leaves. The results indicate that the aqueous extract presents inhibitory activity against important foodborne pathogenic bacteria such as Listeria monocytogenes, Salmonella Enteritidis, Staphylococcus aureus, Bacillus cereus, Aeromonas hydrophila and Pseudomonas aeruginosa. Antimicrobial activity was not observed against Corynebacterium fimi, Clostridium perfringens, Escherichia coli, and the phytopathogenic fungi tested. When applied onto lettuce leaves, pecan... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pecan nutshell; Antimicrobial activity; Lettuce. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000500042 |
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| LIU,Shuchun; YANG,Ming; ZHAO,Huijie; LI,Hua; SUO,Biao; WANG,Yuexia. |
| Abstract Postharvest lettuce often lose water, thus affecting both its market value and consumer acceptance. However, the mechanism of the water-loss is still waiting well exploration. The aim of the present study was to investigate the effect of a foliar application of ABA on the fresh weight-loss and the chlorophyll content of postharvest lettuce as well as its association with the regulation of stomata. The present data demonstrated that exogenously application of ABA, in a concentration range of 0 to 100 µM, significantly lowered the fresh weight-loss of postharvest lettuce. ABA also delayed chlorophyll reduction during ambient storage, but this protective effect was ABA concentration-dependent. Among the tested ABA concentrations, 50 µM or lower ABA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lettuce; Postharvest; Abscisic acid; Water-loss; Stomatal closure. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000400729 |
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| Salazar Ordaz, Liliana. |
| El presente trabajo se llevó a cabo para determinar la distribución e incidencia de Bremia lactucae en los estados de Guanajuato, Puebla y Zacatecas, asimismo se evaluó la resistencia a este patógeno y la calidad postcosecha en 18 variedades de lechuga: Yuma, Costello, Grizzly, Honcho II, Rhino, Top Billings, Warrior, Magnum, Annie, Cool Guard, Denver, Raider, Stallion, Top Gun, Sure Shot, Niner, Red Coach y 9852. Nuestros resultados permitieron confirmar la presencia del patógeno en los estados de Guanajuato, Zacatecas y Puebla donde la incidencia promedio fue 43.11%, 100% y 21.5% respectivamente. Las variedades de lechuga más cultivadas en estos estados fueron Sun Devil, Siskiyou y Coolguard. Sin embargo, las variedades con mayor intensidad de la... |
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Palavras-chave: Lechuga; Bremia lactucae; Calidad postcosecha; Susceptibilidad; Lettuce; Postharvest quality; Susceptibility; Maestría; Fitopatología. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/376 |
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| Pôrto,Mônica L; Alves,Jailson do C; Souza,Adailson P de; Araújo,Raunira da C; Arruda,Jandeilson A de. |
| Lettuce is one of the leading vegetables in Brazil. However, studies concerning its fertilization for the Northeastern region of the country are still scarce. This work was carried out to evaluate the effects of mineral Nitrogen supply and organic fertilization on the production and nitrate accumulation in lettuce, cultivar Elba, in the semi-arid zone of Paraíba, Brazil. A randomized block design, with four replications, was used to test five doses of cattle manure (30; 60; 90; 120, and 150 t ha-1), five doses of N supplied as urea (30; 60; 90; 120, and 150 kg ha-1), and a control without fertilization. Along with mineral N, the other nutrients were also supplied using mineral sources. No additional nutrients were supplied where organic fertilization was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Lettuce; Cattle manure; Urea; Yield. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362008000200019 |
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| Registros recuperados: 49 | |
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