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Showing 1 to 19 of 19 for “"Lettuce (Lactuca sativa)"”.
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Inheritance of Resistance to Tomato Spotted Wilt Virus in Lettuce (Lactuca Sativa L.)
… range, has become a major limiting factor in lettuce production in Hawaii. Symptoms of this disease on lettuce are necrotic spotting of young leaves, stunting, wilting, and death of the plant. The large host range of this disease has made it difficult to control. Genetic resistance might work, …
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Physiological Studies on Nitrate Absorption and Accumulation in Lettuce (Lactuca Sativa L.) Genotypes
Made available in DSpace on 2014-12-16T20:45:20Z (GMT). No. of bitstreams: 1 8908684.pdf: 4598257 bytes, checksum: 01a6e2bf3309b072975d1d75575f467c (MD5) Previous issue date: 1988
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The effect of homoeopathic Ozonum in various potencies on growth and yield of the Lollo Bionda Lobi cultivar of leafy lettuce (lactuca sativa) cultivated in a closed hydroponic system
Mini-dissertation submitted in partial compliance with the requirements of the Master’s Degree in Technology: Homoeopathy, Durban University of Technology, Durban, South Africa, 2012.
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Nitrate accumulation in hydroponically-grown lettuce cultivars and relationship to nitrogen supply
… and reduction in hydroponically-grown lettuce (Lactuca sativa L.), and its relationship to various aspects of N supply, including solution NO$\sb{3-}$ concentration, the nitrate:ammonium solution ratio, and the interaction between solution flow rate and NO$\sb{3-}$ fertilization level.
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The response of 'Buttercrunch' lettuce to applications of cyanobacterium (Nostoc muscorum) in nutrient solution
… rates of nitrogen fertilizer on the growth of lettuce (Lactuca sativa L. cv. Buttercrunch). Lettuce yields increased with increased rates of N. Yields were significantly greater in treatments containing 165 ppm N with N. muscorum culture added (at the rate of 33.3% by volume) than in treatments …
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Effect of airflow and carbon dioxide on growth, yield, and gas exchange of lettuce
Romaine lettuce (Lactuca sativa var. longifolia L.) was grown hydroponically inside a walk-in growth chamber (Conviron, PGW36) with two levels of airflow (0.36 and 2.50 m$\rm\cdot s\sp{-1})$ at different atmospheric CO$\sb2$ concentrations (350 and 700 $\rm\mu mol\cdot mol\sp{-1}).$ A combination …
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Dynamic Environmental Control of a Vertical Farm for Lettuce Production
… Fresh and dry shoot masses of red colored lettuce (Lactuca sativa L. cv. ‘Rouxaï’), along with light use efficiency and electrical use efficiency, were used to evaluate the proposed dynamic light control strategies for growth, while anthocyanin concentration, tipburn severity score, and …
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Optimizing Hydroponic Lettuce Yield: Evaluation of Potassium Source and Concentration with Plant Imaging
… is an expanding industry in the United States. Lettuce (Lactuca sativa) possesses considerable economic importance as one of the foremost leafy vegetables worldwide in terms of financial value for production in CEA. Rapid growth rate, high yield, and potential return further enhance its …
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The effect of fast pyrolysis biochar made from poultry litter on soil properties and plant growth
… a sandy loam soil and a silt loam soil. First, lettuce (Lactuca sativa L) seeds were germinated in the greenhouse across biochar incorporation rates from 0 to 100%, and secondly a trial was conducted in which green peppers (capsicum annum L) were grown in soils with up to 5% biochar by weight. …
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Soil and Wastewater Properties that Influence the Uptake of Anti(retro)viral Pharmaceuticals in Plants
… were utilized to assess the ARVD accumulation in lettuce (Lactuca sativa). Spiked freshwater (stored rainwater) and synthetic wastewater (adopted as a surrogate for actual wastewater) were used as irrigation agents. The OECD 106 adsorption/desorption protocols were used to determine the binding …
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KINETICS, REGULATION AND PURIFICATION OF L-PHENYLALANINE AMMONIA-LYASE FROM GERMINATING LETTUCE SEEDS (PHENYLPROPANOIDS, ENZYME, ALPHA-AMINOXY - BETA-PHENYLPROPIONIC ACID)
… ammonia-lyase (PAL; EC 4.3.1.5) in germinating lettuce (Lactuca sativa cv. Grand Rapids) seeds was investigated. The Km of the enzyme was determined to be 4.2 x 10('-5) M. PAL in lettuce seeds did not show tyrosine ammonia-lyase activity. The nature of inhibition of PAL by various substrate …
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Sorption and bioaccumulation of neutral and ionizable wastewater-derived contaminants of emerging concern: exposure of edible crops via solid and liquid effluent streams
… taken up into edible portions of strawberry and lettuce crops. Two flame retardant chemicals, tris (1-chloro-2-propyl) phosphate (TCPP) and tris (2-chloroethyl phosphate (TCEP) and several polar pharmaceuticals accumulated in a concentration-dependent manner in lettuce (Lactuca sativa) irrigated …
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Mechanisms Of Smoke-Elicited Seed Germination Responses and Possible Candidate Active Compounds In Smoke
… stimulants in alfalfa smoke. Salad Bowl lettuce (Lactuca sativa) seeds treated with serial dilutions of smoke solutions from eight plant species and incubated at 25/25 °C or 25/15 °C in 12 h light/12 h darkness or 24 h darkness for three days. Seeds of six fire-ephemeral species from …
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Trace Metals Mobility in Soils and Availability to Plants from a Long-Term Biosolids Amended Soil
… Zn, respectively. Radish (Raphanus sativus L.), lettuce (Lactuca sativa Var longifolia) and barley (Hordeum vulgare) were planted at the site. Soils were sampled to a depth of 0.9 m and sectioned into 5 cm increments after separating the Ap horizon. Total (EPA 3050B), available (Mehlich-I), …
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Investigating optimum wavelength(s) for growth of Lactuca sativa, L. using tunable LED sources and developing thin-film filters for glass greenhouses
… of the experiment) on a sample plant species of lettuce (Lactuca sativa, L.). Whilst lettuce is often grown in hydroponic systems, the current research is conducted in stand-alone pots with hand watering, due to the requirements of health and safety and available resources. The experiments were …
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Investigating behaviors of zoonotic and human pathogens on plants
… to reduce the persistence of Listeria on lettuce plants as well as its inhibitory properties towards L. monocytogenes on cantaloupe rind. In addition to studying plant-microbe interactions between plants and human bacterial pathogens, it is also important to address plant associations with …
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INNOVATIVE APPROACHES TO PLANT PROTECTION AND PRODUCE SAFETY THROUGH HIGH-PRECISION PLANT MANAGEMENT SYSTEMS
… in economically relevant crops such as lettuce, cucumber, tomato, bell pepper, and wild rocket, assessing their effectiveness against fungal and viral pathogens, as well as their impact on plant physiology and microbial community dynamics. In the first study, six bacterial strains were …
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Water and Nutrient Reuse within Closed Hydroponic Systems
… to maintain outputs while minimizing inputs. <em>Lactuca sativa</em> (lettuce) crops were grown in six closed hydroponic systems utilizing the nutrient film technique. Electrical conductivity was used as the primary indicator of nutrient solution quality and determined if the nutrient solution was …