lettuce Articles
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A machine learning approach to crop localisation using spatial information
This paper describes an approach to recognise and localise centres of mature lettuce heads in the field when the lettuce leaves obscure the distinctions between plants. This is of great value when using an automatic harvester in cluttered or closely planted vegetation. The aim of this work is to investigate and verify the potential use of spatial rather than visual clues for recognition and ...
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Influence of maturity and storage conditions on some mineral contents of lettuce
The effects of maturity and storage conditions on mineral contents of lettuce were studied. Samples of lettuce transplanted 50, 60 and 70 days after sowing were collected from an experimental farm in Nigeria. The samples were stored in the laboratory in a polythene bag of 2 mm thickness and in an open shelf and analysed every two days using the AOAC nutritional guidelines. A one–way ANOVA showed ...
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Biocontrol of Escherichia coli O157:H7 exerted by endogenous microflora and oleoresins in minimally processed lettuce and carrot
The objectives of this study were to analyse the effectiveness of native microflora of lettuce and carrot in controlling Escherichia coli O157:H7 and to evaluate the technological application of oregano and rosemary to control E. coli in vegetables stored at 8?C and 20?C. The interaction between the background microflora of lettuce and carrot with E. coli O157:H7 was observed at 20?C. In samples ...
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CO2 GRO Guelph Lettuce Trials Case Study
Lettuce Growth Trials were carried out at the Controlled Environment Systems Research Facility at the University of Guelph as a part of a larger trial utilizing CO2 GRO Inc.’s licensed gas infusion technology for the growth of all plants using CO2. This report deals only with the lettuce growth trial aspects. Two lettuce crops produced during the trial produced 33% and 100% increases in ...
By CO2 GRO Inc.
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Eco-physiological characteristics of
Pistia stratiotes and its removal of pollutants from livestock wastewaterThe effectiveness of water lettuce in removing pollutants including organic pollutants, nitrogen (NH3-N) and total phosphorus (TP) from livestock wastewater along with the physiological effects and their correlations, was studied for the first time. The results showed that the water lettuce had higher removal efficiency with low concentrations of livestock wastewater. The removal efficiency of ...
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Successful Lettuce Growing in Deep Water Culture With Pure Oxygen
The Future has Begun The company B-Four Agro grows lettuce using the hydroponic method. The heads of lettuce, which grow in covered deep water cultures, find the ideal conditions here for quick and healthy growth. The efficient use of space, combined with a low consumption of resources, protects not only the environment but also enables the growing of lettuce at very low cost. An important ...
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Differential effects of low humidity levels on butterhead quality indices related to external, middle and internal lettuce sections
Leaf water status evolution during greenhouse butterhead lettuce storage under adverse humidity conditions was evaluated. The relationships between water status and the chlorophyll content and overall visual quality (OVQ) were analysed. Parameters were evaluated in external, middle and internal sections of the lettuce heads. Indices showed different behaviour in different sections. There was a ...
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A probabilistic assessment of the contribution of wastewater-irrigated lettuce to
Escherichia coli O157:H7 infection risk and disease burden in Kumasi, GhanaWastewater use for vegetable production is widespread across the cities of many developing countries. Studies on the microbial health risks associated with the practice have largely depended on faecal indicator organisms with potential underestimation or overestimation of the microbial health risks and disease burdens. This study assessed the Escherichia coli O157:H7 infection risk and ...
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Microbial risk in wastewater irrigated lettuce: comparing Escherichia coli contamination from an experimental site with a laboratory approach
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 ...
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Lettuce cationic nutrition and yield, and soil chemical characteristics as affected by vanadium application to leaves or soils
Lettuce plants (Lactuca sativa, L., cv. "trocadero") were grown in pots filled with an Alfisol Udalf or an Andisol Udand soil, under greenhouse conditions. Treatments consisted of adding vanadium to soils (0, 100, 250, 500 and 10001mg1kg1 or as foliar sprays (0, 10, 25, 50, and 1001mg111. Soil chemical characteristics, the cationic nutrition of lettuce and their yields were assessed. No ...
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Härkälän puutarha - Case Study
Härkälä nursery is locally a strong brand. In addition to company image of “locally grown”, the very high quality of Härkälä products keeps the customers happy. “We have long term focus in developing our production. We have been the first to introduce new technologies in climate control and other areas of cultivation. We operate the logistics ...
By Netled Oy
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Seed germination, root elongation, root‐tip mitosis and micronucleus induction of five crop plants exposed to chromium in fluvo‐aquic soil
The present study aims at determining the toxic effects of chromium (Cr) on cabbage (Brassica oleracea), cucumber (Cucumis sativus), lettuce (Lactuca sativa), wheat (Triticum aestivum) and corn (Zea mays), and identify the sensitive plant species and appropriate bioassays for potential use in phytotoxicity assessment of Cr in soil. Results showed that seed germination might not be a sensitive ...
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The future of the Hydroponic Systems
The hydroponics, which had its expansion in the early 70s in order to increase productivity and growing in adverse geographical locations, has a long way to go. Some advances in the hydroponic systems has been made recently at the last frontier: space. At the International Space Station (ISS), water and food are limited resources affected by the cost, transport time and storage. The hydroponic ...
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Modeling the die-off of
E. coli andAscaris in wastewater-irrigated vegetables: implications for microbial health risk reduction associated with irrigation cessationThis study assessed the die-off of Escherichia coli (E. coli) and Ascaris suum on lettuce (Great Lakes 118) and cabbage (Brassica oleracea var capitata) in wastewater-irrigated fields using comparative mathematical die-off models. The study revealed that none of the survival curves of E. coli and A. suum was best fitted with the log-linear model, indicating that the classical first-order ...
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Summer cover crop and management system affect lettuce and cantaloupe production system
Cover crops are widely used in both conventional and organic systems to protect and improve the soil. This study evaluated the effect of summer cover crop and management system on the production of fall romaine lettuce (Lactuca sativa L.) and spring cantaloupe (Cucumis melo L.) from 1999 to 2003. Cover crop treatments included cowpea [Vigna unguiculata (L.) Walp.] incorporated (CPI), cowpea used ...
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The sanitation and urban agriculture nexus: urine collection and application as fertilizer in São Paulo, Brazil
Separately collected urine is an attractive potential fertilizer because of its high nutrient content, low cost, and inherent linkage of urban wastewater management and peri-urban agriculture. Urine from waterless urinals was applied to corn and lettuce plants to examine the impact of urine application rates and frequency on plant growth and soil parameters. In both corn and lettuce ...
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Toxicity of biosolids‐derived triclosan and triclocarban to six crop species
Biosolids are an important source of nutrients and organic matter, which are necessary for the productive cultivation of crop plants. Biosolids have been found to contain the personal care products, triclosan and triclocarban, at high concentrations relative to other pharmaceuticals and personal care products. The current study investigates whether exposure of six plant species (radish, ...
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Effect of Dislodging Techniques on Foliar Residue Determination for Agricultural Crops
Abstract The Agricultural Reentry Task Force (ARTF) conducted a study to determine whether different dislodgeable foliar residue (DFR) techniques had any effect on the amount of residues dislodged from the leaves of vegetable crops. Four previously employed techniques were evaluated with two chemicals (carbaryl and methomyl) on two crops (cabbage and lettuce). Carbaryl, a moderately ...
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Modeling toxicity of binary metal mixtures (Cu2+–Ag+, Cu2+–Zn2+) to lettuce, Lactuca sativa, with the biotic ligand model
The biotic ligand model (BLM) was applied to predict metal toxicity to lettuce, Lactuca sativa. The Cu2+ had the lowest median effective activity (EA50M), compared with Ag+ and Zn2+ (EA50Cu = 2.60 × 10−8 M, EA50Ag = 1.34 × 10−7 M, EA50Zn = 1.06 × 10−4 M). At the 50% response level, the fraction of the total number of biotic ligands occupied by ions (f50M) was lowest for Ag+ among the metals ...
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Pesticide and Pathogen Contamination of Vegetables in Ghana’s Urban Markets
Abstract The objective of the study was to determine and compare the current level of exposure of the Ghanaian urban population to hazardous pesticide and fecal coliform contamination through the consumption of fresh vegetables produced in intensive urban and periurban smallholder agriculture with informal wastewater irrigation. A total of 180 vegetable samples (lettuce, cabbage, and spring ...
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