Relevant bibliographies by topics / Lettuce

Academic literature on the topic 'Lettuce'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Lettuce.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Lettuce"

1

Ma, Yidong, Yin Zhang, Xin Jin, Xinping Li, Huankun Wang, and Chong Qi. "A Visual Method of Hydroponic Lettuces Height and Leaves Expansion Size Measurement for Intelligent Harvesting." Agronomy 13, no. 8 (July 27, 2023): 1996. http://dx.doi.org/10.3390/agronomy13081996.

Full text
Abstract:
Harvesting is an important procedure for hydroponic lettuces in plant factories. At present, hydroponic lettuces are mainly harvested manually, and the key difficulty in mechanical harvesting is reducing the occurrence of leaf injury. Measuring the size of hydroponic lettuces using the image processing method and intelligently adjusting the operating parameters of the harvesting device are the foundation of high-quality harvesting for lettuces. The overlapped leaves of adjacent hydroponic lettuces cause difficulties in measuring lettuce size, especially the leaves expansion size. Therefore, we proposed an image processing method for measuring lettuce height and leaves expansion size according to the upper contour feature of lettuces and an image included three lettuces. Firstly, the upper contours of the lettuces were extracted and segmented via image preprocessing. Secondly, lettuce height was measured according to the maximum ordinate of the contour. Lastly, the lettuce’s upper contour was fitted to a function to measure the leaves expansion size. The measurement results showed that the maximal relative error of the lettuce height measurements was 5.58%, and the average was 2.14%. The effect of the quadratic function in fitting the upper contour was the best compared with the cubic function and sine function. The maximal relative error of the leaves expansion size measurements was 8.59%, and the average was 4.03%. According to the results of the lettuce height and leaves expansion size measurements, the grabbing parameters of each lettuce were intelligently adjusted to verify the harvesting effect. The harvesting success rates of lettuces was above 90%, and the injured leaves areas of the left, middle, and right lettuces in each image were 192.6 mm2, 228.1 mm2, and 205.6 mm2, respectively. This paper provides a reference for the design and improvement of intelligent harvesters for hydroponic lettuces.
APA, Harvard, Vancouver, ISO, and other styles
2

Martínez-Ispizua, Eva, Ángeles Calatayud, José Ignacio Marsal, Claudio Cannata, Federico Basile, Abdelsattar Abdelkhalik, Salvador Soler, José Vicente Valcárcel, and Mary-Rus Martínez-Cuenca. "The Nutritional Quality Potential of Microgreens, Baby Leaves, and Adult Lettuce: An Underexploited Nutraceutical Source." Foods 11, no. 3 (January 31, 2022): 423. http://dx.doi.org/10.3390/foods11030423.

Full text
Abstract:
Interest in the cultivation of lettuce landraces is increasing because native varieties, as high-quality products, are particularly attractive to consumers. Lettuce is a popular leafy vegetable worldwide, and interest in the consumption of first leaves (microgreens) and seedlings (baby leaves) has grown due to the general belief that young plants offer higher nutritional value. The content of some bioactive compounds and antioxidants (chlorophylls, carotenoids, anthocyanins, ascorbic acid, phenols, antioxidant activity) was monitored in six lettuce landraces and five commercial varieties, and compared across three development stages: microgreen, baby, and adult. Ascorbic acid and phenolic contents were 42% and 79% higher, respectively, in the early stages than in adult lettuces, and red-leaf varieties (CL4 and L11) stood out. This finding agrees with lettuce’s marked antioxidant capacity and correlates with its pigment contents, especially anthocyanins. The nutritional value of adult lettuce is conditioned by its size, shape, and head structure as phytochemical concentrations are regulated by light. The low content of ascorbic acid, phenolics, and anthocyanins in crisphead lettuce (CL5) is a clear example (49, 67%, and 27% lower, respectively, than the adult mean). Our results indicate the wide variability of lettuces’ nutritional characteristics and emphasize that traditional varieties are a helpful source of agricultural biodiversity.
APA, Harvard, Vancouver, ISO, and other styles
3

Gisbert, Enric, Sandra Molas, Esteban Hernández, Ricard Carbó, and Alberto Ruiz. "Production of Flathead Grey Mullet (Mugil cephalus) and Lettuce (Lactuca sativa) in a Coupled Aquaponic System under Suboptimal Water Temperatures." Fishes 9, no. 6 (May 21, 2024): 189. http://dx.doi.org/10.3390/fishes9060189.

Full text
Abstract:
The combined production of three varieties of lettuce (romaine, iceberg, and red leaf) with flathead grey mullet (Mugil cephalus) was tested in triplicate in three independent coupled aquaponic units with no thermal control. For this purpose, a total of 114 fish (2.5 kg/m3) were stocked in each fish tank (2 m3), and 92 lettuces were planted in the hydroponic unit (6 m2). As no thermal control was included in the design of the aquaponic system, water temperatures declined from maximum values of 20.4 °C to minimum values of 5.0 °C, which directly affected fish growth. However, the conditions imposed by the aquaponic system were suitable for promoting lettuce’s growth and external appearance, as no pests or leaf discoloration were noticed. Lettuce survival was similar among the three tested varieties (98.5 ± 1.7%). The yields for the romaine and iceberg varieties were 384 ± 100 g/lettuce and 316 ± 70 g/lettuce, respectively, and that for the red leaf variety was lower, at 176 ± 75 g/lettuce. Yield values ranged between 3.6 and 4.4 kg/m2 depending on the replicate considered (4.0 ± 0.4 kg/m2). According to present results, each aquaponic unit required ca. 2.6–2.7 L of water per unit of lettuce produced.
APA, Harvard, Vancouver, ISO, and other styles
4

Choosakul, Nithiwatthn, and Piyanath Pagamas. "The Influence of Color Shading Net on the Growing of Lettuce." Applied Mechanics and Materials 866 (June 2017): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amm.866.33.

Full text
Abstract:
Nowadays, shading net is widely use in Thailand, especially for vegetable production. Many colors of shading net can be found in the market. In this experiment, we set up three net houses for lettuce by using three colors of 50% transparent shading net, black, red and green. Ten of 15 days after planting (DAP) lettuces were moved to each color net house and control (direct sun). Total 40 lettuces were used for 10 days experiment. The result showed that the leave length and width of lettuce under red shading net respectively were significantly bigger than those under green shading net and control treatment without significant difference with the black shading net. The lettuce under red shading net had a highest stem diameter, fresh weight and dry weight comparing with others color shading net. The spectra of the solar radiations that transmitted through the red shading net were suitable for the photosynthesis of the lettuce leaves that could promote lettuce growth and yield.
APA, Harvard, Vancouver, ISO, and other styles
5

Ahsan, Mostofa, Sulaymon Eshkabilov, Bilal Cemek, Erdem Küçüktopcu, Chiwon W. Lee, and Halis Simsek. "Deep Learning Models to Determine Nutrient Concentration in Hydroponically Grown Lettuce Cultivars (Lactuca sativa L.)." Sustainability 14, no. 1 (December 31, 2021): 416. http://dx.doi.org/10.3390/su14010416.

Full text
Abstract:
Deep learning (DL) and computer vision applications in precision agriculture have great potential to identify and classify plant and vegetation species. This study presents the applicability of DL modeling with computer vision techniques to analyze the nutrient levels of hydroponically grown four lettuce cultivars (Lactuca sativa L.), namely Black Seed, Flandria, Rex, and Tacitus. Four different nutrient concentrations (0, 50, 200, 300 ppm nitrogen solutions) were prepared and utilized to grow these lettuce cultivars in the greenhouse. RGB images of lettuce leaves were captured. The results showed that the developed DL’s visual geometry group 16 (VGG16) and VGG19 architectures identified the nutrient levels of lettuces with 87.5 to 100% accuracy for four lettuce cultivars, respectively. Convolution neural network models were also implemented to identify the nutrient levels of the studied lettuces for comparison purposes. The developed modeling techniques can be applied not only to collect real-time nutrient data from other lettuce type cultivars grown in greenhouses but also in fields. Moreover, these modeling approaches can be applied for remote sensing purposes to various lettuce crops. To the best knowledge of the authors, this is a novel study applying the DL technique to determine the nutrient concentrations in lettuce cultivars.
APA, Harvard, Vancouver, ISO, and other styles
6

Makkaew, P., M. Miller, H. J. Fallowfield, and N. J. Cromar. "Microbial risk in wastewater irrigated lettuce: comparing Escherichia coli contamination from an experimental site with a laboratory approach." Water Science and Technology 74, no. 3 (June 6, 2016): 749–55. http://dx.doi.org/10.2166/wst.2016.237.

Full text
Abstract:
This study assessed the contamination of Escherichia coli, in lettuce grown with treated domestic wastewater in four different irrigation configurations: open spray, spray under plastic sheet cover, open drip and drip under plastic sheet cover. Samples of lettuce from each irrigation configuration and irrigating wastewater were collected during the growing season. No E. coli was detected in lettuce from drip irrigated beds. All lettuce samples from spray beds were positive for E. coli, however, no statistical difference (p > 0.05) was detected between lettuces grown in open spray or covered spray beds. The results from the field experiment were also compared to a laboratory experiment which used submersion of lettuce in wastewater of known E. coli concentration as a surrogate method to assess contamination following irrigation. The microbial quality of spray bed lettuces was not significantly different from submersed lettuce when irrigated with wastewater containing 1,299.7 E. coli MPN/100 mL (p > 0.05). This study is significant since it is the first to validate that the microbial contamination of lettuce irrigated with wastewater in the field is comparable with a laboratory technique frequently applied in the quantitative microbial risk assessment of the consumption of wastewater irrigated salad crops.
APA, Harvard, Vancouver, ISO, and other styles
7

Lee, Jung-Soo, Dulal Chandra, and Jinkwan Son. "Growth, Physicochemical, Nutritional, and Postharvest Qualities of Leaf Lettuce (Lactuca sativa L.) as Affected by Cultivar and Amount of Applied Nutrient Solution." Horticulturae 8, no. 5 (May 13, 2022): 436. http://dx.doi.org/10.3390/horticulturae8050436.

Full text
Abstract:
The effects of different nutrient solution quantities on growth, physicochemical, nutritional, and postharvest qualities of lettuce were investigated. Two differently pigmented Korean leaf lettuce cultivars “Geockchima” and “Cheongchima” were grown in soilless perlite culture supplied with 250, 500, 1000, and 2000 mL·d−1·plant−1 nutrient solutions. Several growth parameters (plant height, leaf number, fresh weight, dry matter) were evaluated. The highest lettuce growth was observed when plants were supplied with 1000 mL·d−1·plant−1. Cultivating lettuces in the lowest nutrient solution quantity showed higher dry matter, crude fiber, osmolality, chlorophyll, and anthocyanin contents. Upon increasing the nutrient solution, the crispiness, greenness, and levels of ascorbic acid, nitrogen, and potassium, increased, while phosphorus and magnesium were unaffected, and calcium content declined. Postharvest qualities were better maintained in lettuces irrigated with the least amount of nutrient solution, extending their shelf life. We conclude that lettuce can be grown with 1000 mL·d−1·plant−1 for higher yield, and short-term storage and/or transportation. However, when lettuces need to be stored for a certain period, such as long-distance shipment, they should be cultivated with a limited nutrient solution, which requires further detailed investigation. The results of this study can be applied for distributing, storing, transporting, and marketing lettuce.
APA, Harvard, Vancouver, ISO, and other styles
8

Jefferson de Sá, Jean, Carolina Medeiros Vicentini-Polette, Marta Regina Verruma-Bernardi, Marta Helena Fillet Spoto, and Fernando César Sala. "Agronomic and sensory evaluation of lettuce in hydroponic system." Bioscience Journal 37 (December 29, 2021): e37074. http://dx.doi.org/10.14393/bj-v37n0a2021-53765.

Full text
Abstract:
Lettuce is the most important leafy vegetable in Brazil. Hydroponic lettuce cultivation has grown due to the viability of harvesting throughout the year. In this context, this study aimed to evaluate the agronomic characteristics, color, and preference of curly lettuce in the NFT hydroponic system. Six lineages (6601-1A, 6601-2L, 7016-6A, 7119-1B, 7223-1A, and 7224-4A) and two commercial cultivars (Brida and Vanda) of lettuce were used, in a completely randomized blocks design with four replications. Shoot length, root length, stem length, number of leaves, stem diameter, plant diameter, shoot fresh mass, root fresh mass, chlorophyll content, instrumental color, and sensory characteristics were evaluated. As for agronomic evaluation, the bolting of 6601-2L lettuce was relevant in different attributes. The Vanda lettuce and the lineage 7016-6A presented best performances for shoot fresh mass (399.44 and 378.63 g, respectively), while the lineages 7119-1B and 6601-2L present the worst performance (279.50 and 273.13 g, respectively). There was variation in chlorophyll content and luminosity, however, the evaluators did not notice differences between lettuces for brightness or green color, as well as for crunchy texture. Lettuces 6601-2L, 7224-4A, 6601-1A, Brida, 7223-1A, and 7119-1B were preferred. The variation among plants may be due to different situations, such as harvesting times and bolting, and a direct relationship between agronomic properties and preference among lettuces has not been established yet.
APA, Harvard, Vancouver, ISO, and other styles
9

Ezziddine, Maha, and Helge Liltved. "Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System." Agronomy 11, no. 12 (December 19, 2021): 2586. http://dx.doi.org/10.3390/agronomy11122586.

Full text
Abstract:
In this study, the yield and growth performance of lettuce in an open-air rooftop hydroponic system were investigated. Lettuce was grown in a closed recirculating nutrient film technique (NFT) unit using a standard nutrient solution (NS). Yield, fresh weight, and nutrient content in the leaf tissue of the harvested lettuce were measured. The results were compared with the results obtained in indoor hydroponic lettuce growth with artificial lightning. Despite strong winds during the growth period, 25% of the total lettuce heads weighed twice the marketable weight; however, 25% of the total lettuce heads were below the marketable weight. A more efficient nutrient uptake was indicated by the lettuces in the rooftop system compared with the uptake in the indoor system. Foliar analysis revealed a higher content of all nutrients in the leaves of rooftop hydroponic lettuce compared with indoor hydroponic lettuce. This study suggests that hydroponic rooftop-grown lettuce can be competitive with their indoor counterparts if the rooftop hydroponic system is protected from extreme weather conditions.
APA, Harvard, Vancouver, ISO, and other styles
10

Jung, Dae-Ho, and Jung-Eek Son. "CO2 Utilization Strategy for Sustainable Cultivation of Mushrooms and Lettuces." Sustainability 13, no. 10 (May 13, 2021): 5434. http://dx.doi.org/10.3390/su13105434.

Full text
Abstract:
Mushroom cultivation generates a large amount of CO2 that can be used sustainably. The objective of this study was to use actual cultivation and simulation to find a sustainable cultivation method that uses the CO2 generated by king oyster mushrooms for the production of romaine lettuces. A closed cultivation system consisting of one mushroom chamber, three lettuce chambers, and one gas-mixing chamber was used. Two cultivation conditions, non-continuous and continuous, were analyzed. The non-continuous system cultivated 15 lettuces and 12 mushroom bottles at a time every 25 and 16 days, respectively. The continuous system cultivated three lettuces and mushroom bottles every five and four days, respectively, so that each chamber contained mushrooms or lettuces at each growth stage. The CO2 concentrations in the lettuce and mushroom chambers were stably maintained above 1000 μmol∙mol−1 and below 2000 μmol∙mol−1 in the continuous system. Mathematical models were developed to analyze the CO2 concentration in each chamber. The shoot dry weight of lettuces grown in the mixed cultivation were 48.0%, 21.9%, 19.7%, and 18.1% at 10, 15, 20, and 25 days after transplanting, respectively, higher than those in the lettuce-only cultivation. Compared to mushroom-only cultivation, mixed cultivation reduced the accumulated CO2 emissions into the air by 80.6%. Thus, using CO2 from mushrooms to cultivate lettuce in a continuous cultivation system could reduce CO2 emissions into the air and enable mixed cultivation of mushrooms and lettuces, achieving sustainable agriculture.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Lettuce"

1

Hurlburt, M. W. II, and D. T. Ray. "Thermodormancy in Lettuce." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/214771.

Full text
Abstract:
Most lettuce (Lactuca sativa L) seed fails to germinate at high temperatures. This phenomenon thermodormancy, is common in desert regions where 87% of all lettuce is grown in the U.S.A. A study was conducted using a non-thermodormant plant introduction, PI 251245, and two highly thermodormant Dutch butterhead cultivars, 'Dabora' and 'Severa'. Reciprocal crosses were made and germination trials conducted to observe how maternal and paternal influence and seed color contribute to thermodormancy. At 25 °C, germination was 100% for the three parents and the reciprocal F1 hybrids. Germination differences occurred at both 30° and 35 °C among the parents, with P1251245 with 100% germination and Dabora and Severa with less than 10% germination at both temperatures. Segregating F3 and F4 populations from Dabora x PI 251245 were investigated further. Genetic variation found between families suggests that breeding lettuce for improved thermotolerance may be possible. Seed color did not influence thermodormancy.
APA, Harvard, Vancouver, ISO, and other styles
2

Clark, L. J., R. Walser, and E. W. Carpenter. "Lettuce Variety Trial." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/220344.

Full text
Abstract:
Eleven head lettuce varieties and four leaf lettuce varieties were grown in a replicated small plot trial on the Safford Agricultural Center in 1998. Desertgreen variety of head lettuce from Harris Moran produced a crop with the best head weight, size and firmness rating. Premiere variety followed closely behind. Of the leaf lettuce varieties tested, Saguaro Romaine produced the best quality and quantity product. Per acre yields are calculated for each variety in the study.
APA, Harvard, Vancouver, ISO, and other styles
3

McGrady, John, Michael Matheron, John Palumbo, Michael Rethwisch, Marvin Butler, Joe Matejka, and Phil Tilt. "Sustainable Lettuce Production." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/221435.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Butler, Marvin, and Stan Heathman. "Poast/Lettuce Trial." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/221442.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Contreras, Samuel A. "Effects of maternal plant environment on lettuce (Lactuca sativa L.) seed dormancy, germinability, and storability." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196451272.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Campbell, Paul. "Genetic modification of lettuce for resistance to lettuce necrotic yellows virus /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17584.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ray, Dennis T., James D. McCreight, John J. McGrady, and Judith K. Brown. "Resistance in Cultivated and Wild Lettuce to Lettuce Infectious Yellows Virus." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/214277.

Full text
Abstract:
In 1988, Arizona's early- season lettuce crop was plagued by disease and insect problems, both intensified by unseasonably high temperatures. In the western Arizona production area, an epidemic of lettuce infectious yellows (LIY) resulted in serious economic losses to growers. The yellows disease is incited by the LIY virus (LIYV), a plant virus transmitted by the sweet potato whitefly [Bemisia tabaci (Gene.)]. Disease symptoms in lettuce include stunted growth, rolling yellowing and /or reddening of infected leaves; necrotic lesions appear at or near the leaf margins at latter stages of the disease. LIYV has a wide host range which increases the difficulty of isolating lettuce fields from LIYV infected or whitefly-infested fields; also, whiteflies are resistant to insecticides. Therefore, host-plant resistance appears to be the most promising means of reducing losses due to this disease. To initiate a breeding program, commercial lettuce cultivars and breeding lines (Lactuca sativa L.), and related, cross-breeding wild lettuce species (L. serriola L. and L. saligna L.) were screened for resistance to LIYV in the western Arizona production area using natural inoculation by residence whiteflies.
APA, Harvard, Vancouver, ISO, and other styles
8

Palumbo, John C., and Todd A. Hannan. "Population Growth of Lettuce, Nasonovia ribisnigris, on Resistant Butter and Head Lettuce Cultivars." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/214949.

Full text
Abstract:
Studies to examine lettuce aphid population growth on resistant head and butter lettuce cultivars were conducted in small filed plots at the Yuma Agricultural Center. By artificially infesting plants on several lettuce plantings during the spring, the influence of the resistant lettuce plants were evaluated for their capability of preventing lettuce aphid populations from colonizing plants. Results of five field trials showed that several varieties of head and butter lettuce have been developed that almost completely prevent lettuce aphids from surviving and reproducing on plants during the spring. Although the cultivars tested did not posses marketable characteristic for harvests, they do provide germplasm for breeding new varieties suited for desert production. In addition, these studies also support conclusions drawn from the past several seasons that suggest lettuce aphid population growth is greatest when ambient temperatures average between 65-70 °F.
APA, Harvard, Vancouver, ISO, and other styles
9

Wilcox, Mark. "Cultural Practices in the Production of Iceberg Lettuce in Southwestern Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/147027.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Palumbo, John C., F. J. Reyes, C. H. Jr Mullis, A. Amaya, L. Ledesma, and L. Carey. "Neonicotinoids and Azadirachtin in Lettuce: Comparison of Application Methods for Control of Lettuce Aphids." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/214930.

Full text
Abstract:
Several small-plot field studies were conducted at the University of Arizona, Yuma Agricultural Center in the spring 2001 growing season to evaluate various neonicotinoids and azadirachtin products against lettuce aphid, Nasonovia ribisnigri, in lettuce. Further, these products were compared as soil-applied treatments, foliar sprays and application through sub-surface irrigation. The results of these trials provide useful information for understanding how to effectively use the new chemistries available for aphid management in lettuce. First, Platinum performed best as a post-planting application through a side-dress application or through the drip. The foliar neonicotinoids, Assail and Actara were active against lettuce aphids, but were most effective when populations densities were lower. Comparatively, the conventional chemistries (MSR, Orthene/Provado, Provado/Endosulfan) provided consistent control when used aggressively. The azadirachtin products were significantly less effective against LA in head lettuce due largely to their inability to contact the insects, but on formulation (AzaDirect) showed better efficacy when applied through drip irrigation or sprayed repeatedly in romaine lettuce.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Lettuce"

1

United States. General Accounting Office. General Government Division. Chilean restrictions on lettuce. Washington, D.C: The Office, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

M, Colt W., University of Idaho. Cooperative Extension Service., Washington State University. Cooperative Extension., Oregon State University. Extension Service., and United States. Dept. of Agriculture., eds. Lettuce seed production in the Pacific Northwest. [Corvallis, Or.]: University of Idaho Cooperative Extension Service, Washington State University Cooperative Extension, Oregon State University Extension Service, and U.S. Dept. of Agriculture, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Inglis, Debbie. Anthracnose on lettuce. Pullman: Washington State University, Cooperative Extension, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wiedeman, Sophia. The lettuce girl. Morgantown, WV]: [Sophia Wiedeman], 2015.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Neocleous, D. The effect of growth regulators on the growth and tissue nitrate content of lettuce plants (Lactuca sativa L.) grown in Cyprus. Lefkosia, Cyprus: Agricultural Research Institute, Ministry of Agriculture, Natural Resources and the Environment, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Kobryń, Jolanta. Analiza wzrostu oraz prognozowanie długości cykli produkcji sałaty głowiastej (Lactuca sativa var. capitata L.) w jesienno-zimowej uprawie szklarniowej w zależności od warunków świetlnych. Warszawa: Wydawn. SGGW, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ryder, Edward J. Lettuce, endive, and chicory. New York, NY: CABI Pub., 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Alston, Rod. Brief notes on organic lettuce production. [Dublin]: IOFGA, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Hill, David E. Romaine and looseleaf lettuce trials, 1996-1997. New Haven: Connecticut Agricultural Experiment Station, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hill, David E. Romaine and looseleaf lettuce trials, 1996-1997. New Haven: Connecticut Agricultural Experiment Station, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Lettuce"

1

Reddy, P. Parvatha. "Lettuce." In Sustainable Crop Protection under Protected Cultivation, 327–35. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-952-3_26.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Davey, M. R., P. Anthony, P. Van Hooff, J. B. Power, and K. C. Lowe. "Lettuce." In Transgenic Crops IV, 221–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-36752-9_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wien, H. C. "Lettuce." In The physiology of vegetable crops, 333–56. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781786393777.0333.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Mou, Beiquan. "Lettuce." In Vegetables I, 75–116. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-30443-4_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Parthasarathy, S., P. Lakshmidevi, P. Yashodha, and C. Gopalakrishnan. "Lettuce." In Pests and Diseases in Vegetable Crops, 155–63. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003504153-14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gratwick, Marion. "Lettuce aphids." In Crop Pests in the UK, 51–55. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1490-5_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Cantliffe, Daniel J., Yu Sung, and Warley M. Nascimento. "Lettuce Seed Germination." In Horticultural Reviews, 229–75. Oxford, UK: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470650776.ch5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Taylor, Lawrence J. "Love and Lettuce." In Tales from the Desert Borderland, 35–51. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35133-5_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Sastry, K. Subramanya, Bikash Mandal, John Hammond, S. W. Scott, and R. W. Briddon. "Lactuca sativa (Lettuce)." In Encyclopedia of Plant Viruses and Viroids, 1315–36. New Delhi: Springer India, 2019. http://dx.doi.org/10.1007/978-81-322-3912-3_504.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Simko, Ivan, Ryan J. Hayes, Beiquan Mou, and James D. McCreight. "Lettuce and Spinach." In Yield Gains in Major U.S. Field Crops, 53–85. Madison, WI, USA: American Society of Agronomy and Soil Science Society of America, 2015. http://dx.doi.org/10.2135/cssaspecpub33.c4.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Lettuce"

1

Sanghavi, Bela Sameep. "Golden Ratio Lettuce." In 2021 IEEE Integrated STEM Education Conference (ISEC). IEEE, 2021. http://dx.doi.org/10.1109/isec52395.2021.9763975.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Pašić, Sanid, and Dževad Lavić. "PRINOS SALATE „SHANGORE“ UZ UPOTREBU RAZLIČITIH NAČINA ISHRANE I NASTIRANJA ZEMLJIŠTA." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.149p.

Full text
Abstract:
The paper presents the basic characteristics and prerequisites for improving the production of butter lettuce "Shangore" in order to obtain guidelines in the application of lettuce cultivation technology, stable yield, increased nutritional value and uniform quality. Fertilization treatments in the experiment included: phosphate-based mineral fertilizer, humic acid-based organic fertilizer, and liquid organic-mineral fertilizer. The results of this research indicate that the average value of lettuce yield was the highest in the application of fertilizers with potassium phosphate and the application of mulch combination PE - black foil and agrotextiles and amounted to 45,997 kg / ha in 2021. The lowest yield of lettuce was registered in the control variant and amounted to 22,487 kg / ha in 2020.
APA, Harvard, Vancouver, ISO, and other styles
3

Baghina, Narcis Gheorghe, Despina-Maria Bordean, Liana Maria Alda, Ioan Gaica, and Daniel Dorin Dicu. "THE INFLUENCE OF CLIMATE CHANGE ON LEAFY VEGETABLES MINERAL COMPOSITION." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/4.2/s19.54.

Full text
Abstract:
Lettuce is one of the most popular leafy vegetables due to the high concentrations of minerals and vitamins. The high ecological plasticity and short vegetation period makes it extremely vulnerable to environmental conditions and, indirectly, to climate change. In order to obtain plants with valuable nutritional profile, the environmental conditions for cultivation, like moisture content and temperature are very important. There are many research studies performed concerning the effects of climatic changes on agricultural production, but the impact on the nutritional value of foods has not been commonly studied. The question to which this study intends to answer is to present the influence of climate change on mineral content of lettuce based on database information and experimental data, using different mathematical models. Even if lettuce production is performed mostly under controlled conditions, there are important modifications regarding nutritional profiles of lettuce, in special minerals content.
APA, Harvard, Vancouver, ISO, and other styles
4

Feitoza, L. A. T. F., P. T. Carneiro, J. M. Silva Júnior, A. L. Santos Neto, W. M. Santos, and J. M. Santos. "PRODUCTION IRRIGATED LETTUCE WITH WATERS SALINIZED." In III Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/INCT-EI, 2015. http://dx.doi.org/10.12702/iii.inovagri.2015-a373.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Ilić, Zoran, Nikolaos Kapoulas, Athanasios Koukounaras, and Nataša Mirecki. "Mineral profile of lettuce and green onion." In VII South-Eastern Europe Syposium on Vegetables & Potatoes. University of Maribor Press, 2017. http://dx.doi.org/10.18690/978-961-286-045-5.7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Ilić, Zoran, Lidija Milenković, Ljiljana Stanojević, Aleksandra Dimitrijević, Dragan Cvetković, Žarko Kavresan, and Jasna Mastilović. "Summer production of lettuce under shading conditions." In VII South-Eastern Europe Syposium on Vegetables & Potatoes. University of Maribor Press, 2017. http://dx.doi.org/10.18690/978-961-286-045-5.9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Vanessa Ribeiro Urbano, Thaís Grandizoli Mendonça, Antonio Claudio Testa Varallo, Reinaldo Gaspar Bastos, and Claudinei Fonseca Souza. "Use of treated wastewater for lettuce cultivation." In 2013 Kansas City, Missouri, July 21 - July 24, 2013. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2013. http://dx.doi.org/10.13031/aim.20131606586.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Nang Van Nguyen and Suguru Yamane. "Cutting component development for a lettuce harvester." In 2013 Kansas City, Missouri, July 21 - July 24, 2013. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2013. http://dx.doi.org/10.13031/aim.20131632613.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wang, Luhan, Lihua Zheng, Minjuan Wang, Yueting Wang, and Minzan Li. "Kinect-based 3D Reconstruction of Leaf Lettuce." In 2020 ASABE Annual International Virtual Meeting, July 13-15, 2020. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2020. http://dx.doi.org/10.13031/aim.202000545.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Juliastuti, Sri Rachmania, Farah Salsabila, Fairuza Fasya Rahadisty, Lailatul Qadariyah, and Siti Nurkhamidah. "Production of Cu-EDTA, Zn-EDTA, CuZn-EDTA as a Micronutrient Fertilizer and its Application to Lettuce." In 4th International Seminar on Fundamental and Application of Chemical Engineering. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-opjm7m.

Full text
Abstract:
Plants need two types of nutrients, which are macronutrients and micronutrients. Micronutrient needed by plants in small concentration (≤ 100 ppm) i.e. Cu and Zn. This study aims to determine the best composition ratio of Cu:EDTA, Zn:EDTA, and Cu:Zn:EDTA for making the micronutrients, determine the effect of Cu and Zn on lettuce (Lactuca sativa L), and determine the most effective type of micronutrient fertilizer and its concentration for lettuce growth. It was started by dissolving materials with 200 ml distilled water, then stirred and heated at 70-80°C for two hours. After that, the solution was precipitated for two days at room temperature. Methanol was added only before precipitating CuZn-EDTA. The precipitate or micronutrient crystals of Cu-EDTA, Zn-EDTA, and CuZn-EDTA were then filtered and dried in a desiccator for three days. Each of micronutrient crystal was dissolved into 25 ml water then the lettuce will be sprayed with micronutrient solution for two and three sprays once a week. Observations related to the quantity of leaves, plant length, and leaf width were carried out for 25 days and then plant harvested and weighed. The result shows that the best compotition ratio for making micronutrients were Cu:EDTA (1:1.85)w/w; Zn:EDTA (1:3.43)w/w; and Cu:Zn:EDTA (1:1.6:3.85)w/w/w. Concentration of micronutrient solution applied were 5000 and 1000 ppm. Respectively for each concentration, micronutrient CuZn-EDTA affected the leaves quantity growth with the slope of 0.0655 and 0.0642; and yields (g/cm2) with the slope of 0.495 and 0.46. Zn-EDTA had an effect on plant length growth with a slope of 0.1525 and 0.091; and leaf width growth with a slope of 0.0216 and 0.0111. Cu and Zn contained in lettuce leaves then analyzed and was known for Cu-EDTA, Cu and Zn contained (mg/kg) respectively were 37.78 and 50.68; for Zn-EDTA were 32.8 and 61.25; for CuZn-EDTA were 33.23 and 48.16 (mg/kg). The metal content analyzed in lettuce leaves is not suitable for consumption because it exceeds the maximum limit written on the Decree of the Directorate General of POM No 03725/B/SK/VII/89. Application of fertilizer should be more diluted to less than the maximum limit.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Lettuce"

1

Nair, Ajay, Brandon H. Carpenter, Rajeev Arora, and Nicholas P. Howell. Season Extension Strategies for Fall Lettuce Production. Ames: Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/farmprogressreports-180814-759.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Rakutko, S. A., and E. N. Rakutko. THE VERIFICATION OF RECIPROCITY LAW IN LETTUCE GROWING. Инновации в сельском хозяйстве, 2018. http://dx.doi.org/10.18411/0131-5226-2018-11990.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

ADAS, RSK. Nitrate Surveillance Monitoring Program (Annual Report May 2021 - March 2022). Food Standards Agency, December 2022. http://dx.doi.org/10.46756/sci.fsa.uau489.

Full text
Abstract:
Every Member State is required to monitor and report levels of nitrate in specified foodstuffs as part of the European Commission regulation and the UK also requires this information as part of the collection of data to support the review of retained EU law in the UK and inform the setting of policy around maximum nitrate levels. The requirement to carry out monitoring for nitrate in lettuce, spinach and rocket is being met by the UK Nitrate Surveillance Programme. Results are presented for the period between 1st April 2021 and 31st March 2022. A total of 202 samples were collected within the sampling period, comprising of 130 lettuce, 9 rocket, 26 spinach samples. A further 37 samples categorised at “Other Green Leafy Vegetables”, which comprised of samples including mustard, mizuna, celery, Pak Choi and cabbage. The lowest average nitrate concentration was recorded in summer-grown iceberg lettuce (935.2 mg/kg), and no iceberg samples exceeded the maximum nitrate concentration. The highest average nitrate concentration was seen in winter grown non-iceberg lettuce grown under protection within the lettuce group (3242.2 mg/kg), and in winter-grown rocket overall (4271.2 mg/kg). The number of samples exceeding the maximum threshold increased this year to 7 samples – 2 samples of open-air non-iceberg lettuce sampled in the summer, 1 sample of protected non-iceberg lettuce in the summer, and 3 samples of spinach. A further 4 samples were within 10% of the maximum threshold. Consistent with previous years of this project, a strong correlation was found between nitrate concentration and sampling date, with samples collected later in the season showing greater concentrations, indicating potential interactions between nitrate accumulation and climate – particularly light levels and available soil moisture and the accumulation of nitrate in the soil through subsequent fertiliser applications with successive planting. Furthermore, there was significant interaction between nitrate accumulation, product type and cultivation type, which could be further explored to better identify risk factors associated with nitrate accumulation in leafy vegetables grown in the UK.
APA, Harvard, Vancouver, ISO, and other styles
4

Nair, Ajay, and Bernard J. Havlovic. Mulch and Row Cover affect Lettuce Production in High Tunnels. Ames: Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/farmprogressreports-180814-2420.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Brandl, Maria T., Shlomo Sela, Craig T. Parker, and Victor Rodov. Salmonella enterica Interactions with Fresh Produce. United States Department of Agriculture, September 2010. http://dx.doi.org/10.32747/2010.7592642.bard.

Full text
Abstract:
The emergence of food-borne illness outbreaks linked to the contamination of fruits and vegetables is a great concern in industrialized countries. The current lack of control measures and effective sanitization methods prompt the need for new strategies to reduce contamination of produce. Our ability to assess the risk associated with produce contamination and to devise innovative control strategies depends on the identification of critical determinants that affect the growth and the persistence of human pathogens on plants. Salmonella enterica, a common causal agent of illness linked to produce, has the ability to colonize and persist on plants. Thus, our main objective was to identify plant-inducible genes that have a role in the growth and/or persistence of S. enterica on postharvest lettuce. Our findings suggest that in-vitro biofilm formation tests may provide a suitable model to predict the initial attachment of Salmonella to cut-romaine lettuce leaves and confirm that Salmonella could persist on lettuce during shelf-life storage. Importantly, we found that Salmonella association with lettuce increases its acid-tolerance, a trait which might be correlated with an enhanced ability of the pathogen to pass through the acidic barrier of the stomach. We have demonstrated that Salmonella can internalize leaves of iceberg lettuce through open stomata. We found for the first time that internalization is an active bacterial process mediated by chemotaxis and motility toward nutrient produced in the leaf by photosynthesis. These findings may provide a partial explanation for the failure of sanitizers to efficiently eradicate foodborne pathogens in leafy greens and may point to a novel mechanism utilized by foodborne and perhaps plant pathogens to colonize leaves. Using resolvase in vivo expression technology (RIVET) we have managed to identify multiple Salmonella genes, some of which with no assigned function, which are involved in attachment to and persistence of Salmonella on lettuce leaves. The precise function of these genes in Salmonella-leaf interactions is yet to be elucidated. Taken together, our findings have advanced the understanding of how Salmonella persist in the plant environment, as well as the potential consequences upon ingestion by human. The emerging knowledge opens new research directions which should ultimately be useful in developing new strategies and approaches to reduce leaf contamination and enhance the safety of fresh produce.
APA, Harvard, Vancouver, ISO, and other styles
6

Lounibos, Leon P. Population Regulation of Mansonia Mosquitoes on Water Lettuce (Pistia stratiotes L.). Fort Belvoir, VA: Defense Technical Information Center, May 1988. http://dx.doi.org/10.21236/ada200800.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Melotto, M., and S. Sela. NIFA-BARD collaborative, mechanisms of salmonella adaptation to the lettuce phyllosphere. Israel: United States-Israel Binational Agricultural Research and Development Fund, 2022. http://dx.doi.org/10.32747/2022.8134153.bard.

Full text
Abstract:
The goal of this study is to evaluate the risk associated with colonization of the plant with Salmonella and to provide the scientific basis required to reduce plant's colonization by this pathogen through characterization of the molecular and physiological mechanisms that enable Salmonella to colonize vegetable crops
APA, Harvard, Vancouver, ISO, and other styles
8

Geneva, Maria, Kostadin Kostadinov, Stoyan Filipov, Elisaveta Kirova, and Ira Stancheva. Analysis of the Antioxidant Capacity of Lettuce Growth at Different Fertilizer Regimes. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, January 2021. http://dx.doi.org/10.7546/crabs.2021.01.18.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Michelmore, Richard, Eviatar Nevo, Abraham Korol, and Tzion Fahima. Genetic Diversity at Resistance Gene Clusters in Wild Populations of Lactuca. United States Department of Agriculture, February 2000. http://dx.doi.org/10.32747/2000.7573075.bard.

Full text
Abstract:
Genetic resistance is often the least expensive, most effective, and ecologically-sound method of disease control. It is becoming apparent that plant genomes contain large numbers of disease resistance genes. However, the numbers of different resistance specificities within a genepool and the genetic mechanisms generating diversity are poorly understood. Our objectives were to characterize diversity in clusters of resistance genes in wild progenitors of cultivated lettuce in Israel and California in comparison to diversity within cultivated lettuce, and to determine the extent of gene flow, recombination, and genetic instability in generating variation within clusters of resistance genes. Genetic diversity of resistance genes was analyzed in wild and cultivated germplasm using molecular markers derived from lettuce resistance gene sequences of the NBS-LRR type that mapped to the major cluster if resistance genes in lettuce (Sicard et al. 1999). Three molecular markers, one microsatellite marker and two SCAR markers that amplified LRR- encoding regions, were developed from sequences of resistance gene homologs at the Dm3 cluster (RGC2s) in lettuce. Variation for these markers was assessed in germplasm including 74 genotypes of cultivated lettuce, L. saliva and 71 accessions of the three wild Lactuca spp., L. serriola, L. saligna and L. virosa that represent the major species in the sexually accessible genepool for lettuce. Diversity was also studied within and between natural populations of L. serriola from Israel and California. Large numbers of haplotypes were detected indicating the presence of numerous resistance genes in wild species. We documented a variety of genetic events occurring at clusters of resistance genes for the second objective (Sicard et al., 1999; Woo el al., in prep; Kuang et al., in prepb). The diversity of resistance genes in haplotypes provided evidence for gene duplication and unequal crossing over during the evolution of this cluster of resistance genes. Comparison of nine resistance genes in cv. Diana identified 22 gene conversion and five intergenic recombinations. We cloned and sequenced a 700 bp region from the middle of RGC2 genes from six genotypes, two each from L. saliva, L. serriola, and L. saligna . We have identified over 60 unique RGC2 sequences. Phylogenetic analysis surprisingly demonstrated much greater similarity between than within genotypes. This led to the realization that resistance genes are evolving much slower than had previously been assumed and to a new model as to how resistance genes are evolving (Michelmore and Meyers, 1998). The genetic structure of L. serriola was studied using 319 AFLP markers (Kuang et al., in prepa). Forty-one populations from Turkey, Armenia, Israel, and California as well as seven European countries were examined. AFLP marker data showed that the Turkish and Armenian populations were the most polymorphic populations and the European populations were the least. The Davis, CA population, a recent post-Columbian colonization, showed medium genetic diversity and was genetically close to the Turkish populations. Our results suggest that Turkey - Armenia may be the center of origin and diversity of L. serriola and may therefore have the greatest diversity of resistance genes. Our characterization of the diversity of resistance genes and the genetic mechanisms generating it will allow informed exploration, in situ and ex situ conservation, and utilization of germplasm resources for disease control. The results of this project provide the basis for our future research work, which will lead to a detailed understanding of the evolution of resistance genes in plants.
APA, Harvard, Vancouver, ISO, and other styles
10

Carpineti, C., L. Bautista, A. Garcia Sales, S. van de Voort, S. van Marrewijk, and D. Klijn. Comparative study on lettuce cultivation within Fieldlab Vertical Farming : Comparative study on the cultivation of lettuce in indoor farms of WUR, Delphy, Logiqs, Vertify and Philips Horticulture LED Solutions. Wageningen: Wageningen Plant Research, 2024. http://dx.doi.org/10.18174/650896.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Lettuce' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography