Ángel Jesús Callejon-Ferre

Ángel Jesús Callejon-Ferre
Universidad de Almería | UAL · Department of Engineering

Professor

About

72
Publications
46,219
Reads
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1,581
Citations
Citations since 2017
32 Research Items
1217 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (72)
Article
The objective of the present study was to show the relationship between total soluble solids (TSS) and dry matter content (DMC) at harvest and of shelf life of cucumber (Cucumis sativus L.) cultivars. Two groups of cultivars with different production cycles were studied during two agricultural seasons. Sample cucumbers were stored for 28 d in the d...
Article
The main aim of this study is to investigate the thermal behaviour of the different parts of almond shells produced in an almond industry as a waste biomass. For this purpose, several experiments have been conducted under laboratory conditions. After removing the mature almonds, the waste raw materials subject of this study were treated with distil...
Article
Full-text available
The cultivation of vegetables in greenhouses is characterised by high planting density and environmental conditions that favour the development of pests and diseases. These are mainly controlled using plant protection products applied with a hand-held sprayer. This is inefficient low-tech equipment that is difficult to calibrate. The study evaluate...
Article
Agricultural workers have an increased risk of musculoskeletal disorders, mainly due to the manual nature of the work. This study assesses the level of physical well-being in pepper cultivation workers in Almería (Spain). The objective was to analyze pepper cultivation tasks performed in the Almería-type greenhouse, using the OWAS (Ovako Working Po...
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This paper shows the prevalence of psychosocial risks for workers in the greenhouse construction industry in south-eastern Spain. Method: The assessment of the workers’ psychosocial risks was carried out through simple random sampling, which uses a questionnaire containing 13 variables characterizing the companies, 14 variables characterizing the w...
Article
The construction industry is considered one of the highest risk production sectors, even more so in developing countries such as Guatemala. A characterization has been carried out on the perception of Guatemalan construction company managers regarding, the risk of accidents exist for the different activities they perform. The characterization has b...
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Spain is the largest producer of olive oil in the world and, consequently, it has the world’s largest olive-growing area. Workers are highly exposed to musculoskeletal risks due to the manual nature of most of the tasks they perform. The objective of this study is to assess the musculoskeletal risks faced by olive workers in the province of Jaén (S...
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Students in the electrical branch of the short-cycle tertiary education program acquire developmental and design skills for low voltage transmission power lines. Aerial power line design requires mathematical tools not covered well enough in the curricula. Designing suspension cables requires the use of a Taylor series and integral calculation to o...
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The objective of this study was to reveal RULA method applications in terms of the knowledge, country, year and journal categories. The search was performed using the “Web of Science Core Collection”. The period from 1993 to April 2019 was selected. Eight hundred nine results were obtained, of which 226 were used. The largest number of publications...
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The objective of this work is to review literature, worldwide, in which the Rapid Entire Body Assessment (REBA) ergonomic assessment method was applied and count the number of times that REBA was applied together with other methods and subsequent incidence. The database used was the “Web of Science—Core Collection”. Only scientific articles and bib...
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Greenhouse workers, despite being in a space beneath a plastic cover, may be susceptible to risks associated to ultraviolet (UV) radiation in skin and eyes. The present work focuses on experimentally analysing this risk throughout a complete year. For this purpose, a network of sensors has been designed, comprising 12 UV radiation measuring station...
Article
Flexible photovoltaic panels are an option to generate renewable energy that could be compatible with the production of greenhouse crops, especially in warm sunny countries. The aim of this study was to evaluate, during two growing seasons, the effect of shading caused by flexible photovoltaic panels mounted on the greenhouse roof on tomato plant m...
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Musculoskeletal disorders cause serious problems that affect workers in many sectors. The objective of this study is the ergonomic analysis of melon cultivation farmers in Almeria-type greenhouses. For this, the rapid upper limb assessment (RULA) method has been applied after carrying out a detailed process of observing the farmers’ tasks. The stud...
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Occupational health and safety allows the prevention of occupational diseases and accidents. Agriculture is one of the sectors in which it is important to prevent the musculoskeletal disorders that workers usually develop. The objective of this study is the evaluation of postures adopted by courgette farmers in greenhouses of the Almeria-type. OWAS...
Article
Expensive ultrasonic anemometers are usually required to measure wind speed accurately. The aim of this work is overcome the loss of accuracy of a low cost hot-wire anemometer caused by changes of air temperature, by means of a probabilistic calibration using Gaussian Process Regression. Gaussian Process Regression is a non-parametric, Bayesian and...
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The goal of this paper is to show that logistic regression is an analytical method of interest to evaluate the marketability of different pepper (Capsicum annuum L.) cultivars. Two studies were conducted on “Italian sweet” pepper cultivars. Fruit samples were introduced in storage chambers and kept at 9 °C and 85–95% relative humidity during the st...
Article
We have introduced the use of multivariate NMR analysis in the development of accurate and robust prediction models, potentially arising from a correlation between soluble metabolite profiles and cell wall composition, for the determination of hemicellulose, cellulose and lignin contents in 8 species of greenhouse crop residues. The present paper d...
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The aim of this study is to establish a binary logistic regression method to evaluate and select cucumber cultivars (Cucumis sativus L.) with a longer postharvest shelf life. Each sample was evaluated for commercial quality (fruit aging, weight loss, wilting, yellowing, chilling injury, and rotting) every 7 days of storage. Simple and multiple bina...
Article
A dendrometric and energetic characterisation of Tamarix africana L. was carried out in this study. This is an indigenous plant species in the Mediterranean area, and it can survive in semi-arid areas with saline soils and occasional floods. Owing to these characteristics, this species is a good candidate for its use in the restoration of several e...
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Herbaceous crop yield intensification creates favourable conditions for the development of pests that intensify the attack of soil pathogens traditionally controlled by disinfectant, which are mostly prohibited and unlisted because of their toxicity. The use of grafted plants solves this problem and assists in addressing abiotic stress conditions....
Article
In southeast Spain (Almería), we find the highest concentration of greenhouse crops in Europe, an agricultural sector that directly employs 55,000 people. The objective of this research was to evaluate the musculoskeletal working conditions of greenhouse workers through the standardized Nordic questionnaire. This questionnaire presents 28 multiple...
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The purpose of this study was to demonstrate interest in applying simple and multiple logistic regression analyses to the marketability probability of commercial tomato (Solanum lycopersicum L.) cultivars when the tomatoes are harvested as loose fruit. A fruit’s firmness and commercial quality (softening or over-ripe fruit, cracking, cold damage, a...
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Health and safety at work directly influence the development of sustainable agriculture. In the agricultural sector, many farm workers suffer musculoskeletal disorders caused by forced posture. The objective of this research is to assess working postures during melon cultivation in Almería-type greenhouses. The Ovako Working Posture Assessment Syst...
Article
Studies about the air temperature inside greenhouses are usually focused on the crop growth. However, the thermal environment inside greenhouses can affect the safety of the workers and also their productivity. This work focuses on the study of air temperature conditions with respect to workers following the requirements and methods gathered in ISO...
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Tractors are used to perform jobs that require different types of agricultural tools to be attached to their rear, to their front, or both. These tools may need to be dragged, towed, or suspended above ground, and sometimes require a power supply; this is usually obtained via a hydraulic system or from the tractor’s power take-off system. When trac...
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The use of alternative energy in agricultural production is desired by many researchers, especially for protected crops that are grown in greenhouses with photovoltaic panels on the roofs. These panels allow for the passage of varying levels of sunlight according to the needs of each type of crop. In this way, sustainable and more economic energy c...
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In Mediterranean countries of Southern Europe, the climatic conditions are usually favourable to cultivate greenhouse vegetables but not always for workers. The aim of this study was to design a network of weather stations capable of gathering data of environmental parameters related to the wellbeing of workers in greenhouses in south-eastern Spain...
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Sustainability seeks to provide economically viable products in an environmentally friendly way while respecting worker rights. Physical wellbeing forms part of these rights. Musculoskeletal disorders (MSD) diminish productivity, cause absence from work, impose costs on the public health system and can cast doubt on the sustainability of a company...
Article
Choosing the appropriate machinery for applying pesticides is crucial. Despite the availability of technologically more advanced equipment, the hand-held spray gun is still widely used today for spraying greenhouse crops because of its ease of operation and its low economic cost. Growers believe that a high spray application rate and a high pressur...
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The prevention of musculoskeletal disorders (MSD) is very important in the world. Governments and companies are the most interested. The objective of the present work is to review the literature on the applications of the OWAS method in the diverse sectors or fields of knowledge and countries from its publication to March 2017. The use of OWAS meth...
Chapter
Pruning of fruit trees produces a great quantity of biomass each year that can be used for energy production. For this purpose, it is necessary to carry out an energy characterization of these pruned wastes, where the determination of heating value is significant. This value is usually measured by an adiabatic or isoperibolic calorimeter, which cau...
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Most distributed-generation facilities are performed on pre-built distribution grids. The design conditions of these existing grids may limit the ability of new users to get a connection due to technical and/or cost constraints. This work proposes a simple solution, adjusted to the relevant regulations and embodied in a radial distribution grid of...
Article
This work used the FPSICO v.1 method of the Spanish National Institute of Safety and Hygiene to determine the possible psychosocial risks of farm workers in Almería-type greenhouses located in south-eastern Spain to propose health-condition improvements. A 75-question survey was used to evaluate seven psychosocial variables: cognitive load, tempora...
Article
The energy use of biomass in rural areas is starting to interest the farmers in Ecuador. Its use is recognized as environmentally friendly, but knowledge about the raw materials to be used as bioenergy remains meager. The objective of this research was to characterize five species located in the province of Guayas: avocado (Persea americana L.), ca...
Article
The integration of renewable energies, and therefore the generation of a clean and sustainable energy, is a current demand by society. The use of real-time pricing offers advantages for integrating renewable resources into the electrical grid. This is because users enhance the flexibility of their own energy demand thanks to planning loads with acc...
Article
Within the realm of renewable energies, biomass will play a fundamental role in the coming years, especially due to the rise in the prices of fossil fuels, the doubtful safety of nuclear energy, and the need to reduce CO2 emissions. In Almer a (SE Spain), a million tonnes of plant wastes are generated per year from greenhouse crops such as Cucurbit...
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The aim of this work was to evaluate the amount of residual biomass obtained from citrus tree plantations. This amount is influenced by the variety and aim of the pruning. The trials show that the amount of pruned biomass can be considered similar in the varieties Naveline and Washington Navel, giving an average 4.73 kg per tree and 2.68 tons per h...
Article
This work reports the use of the Mini Psychosocial Factor (MPF) method for assessing the psychosocial risks faced by agricultural workers in the greenhouses of Almería (Spain) with the aim of improving their health. The variables Rhythm, Mobbing, Relationships, Health, Recognition, Autonomy, Emotional Involvement, Support, Compensation, Control, De...
Article
In the modern agriculture, greenhouses are well established as technological solutions aimed to increase plants productivity and crops quality. Greenhouses can include added capabilities for the energy generation by the integration of photovoltaic solar modules in their cladding areas provided that the blocking effect of photosynthetically active r...
Article
Following the discovery of fire, biomass became the main source of energy used by mankind. Advanced societies have largely replaced the use of biomass with the use of fossil fuels, but our dependence on these ever scarcer resources, plus the need to reduce CO2 emissions in the face of climate change, is forcing us to make use of renewable sources o...
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This study evaluates the technology and work systems used in order to harvest residual biomass from pruning in the specific conditions of Mediterranean fruit orchards (narrow distances between crop-rows). Harvesting has been divided into several types of operations - pruning, biomass alignment between crop tracks, biomass concentration in piles, ch...
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This paper reports the development and testing of a new procedure for constructing multi-span greenhouses, based on the assembly of the roof structure at ground level and later raising it to its final position. To compare the proposed and traditional construction procedures, a greenhouse was assembled employing each method to erect one half of the...
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Currently the application rate of plant-protection products is indicated as a concentration and amount of product per ha. Because the canopy of greenhouse crops grows continuously in vertical planes, and its height and width develop very much within relatively short periods of time, the leaf area to be treated can change from nearly zero to over 40...
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The integration of renewable energy sources into greenhouse crop production in southeastern Spain could provide extra income for growers. Wind energy could be captured by small to medium-sized wind turbines, gas could be produced from biomass, and solar energy could be gathered by solar panels. The aim of this study was to examine the effect of fle...
Article
The aim of the present work was to evaluate the thermal environment of workers in the greenhouse-construction industry in SE Spain. For this, the heat stress of these workers was evaluated by the WBGT index, on developing quadratic equations of the maximum and minimum of this index according to the time of day. High correlation coefficients and goo...
Article
This work uses the Labour Economics and Sociology Laboratory of France (LEST) method to evaluate the ergonomic-psycholsociological quality of work in horticultural greenhouse exploitations in Almería (Spain) with the aim of improving workers’ occupational health. Data on the factors affecting the physical environment, the physical workload, mental...
Article
This work analyses the labour accidents in the greenhouse-construction industry of SE Spain for the period 1999-2007 through a sample of 180 accident reports. The accidents were characterised by studying 5 variables in order to know the day of the week in which the accident occurred, the hour of the day of the accident, type of accident, the region...
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The present paper shows a research where a new capital for multispan greenhouses has been designed with the requirement of compatibility with the construction procedure consisting on raising the greenhouses roof. To obtain a better view of the base capital structural deficiencies, and to verify the efficiency of adopted measures with the new capita...
Article
Almería, in southeastern Spain, generates some 1,086,261 t year-1 (fresh weight) of greenhouse crop (Cucurbita pepo L., Cucumis sativus L., Solanum melongena L., Solanum lycopersicum L., Phaseoulus vulgaris L., Capsicum annuum L., Citrillus vulgaris Schrad. and Cucumis melo L.) residues. The energy potential of this biomass is unclear. The aim of...
Article
Preventive action in companies is one of the bases of ergonomic intervention. Therefore, in the present work, the preventive activity of greenhouse-construction companies in south-eastern Spain is characterized. A sample was taken by means of a questionnaire structured in four groups of variables: general characteristics of the company, characteris...
Article
Almería, in southeastern Spain, generates some 1,086,261 t year -1 (fresh weight) of greenhouse crop (Cucurbita pepo L., Cucumis sativus L., Solanum melongena L., Solanum lycopersicum L., Phaseoulus vulgaris L., Capsicum annuum L., Citrillus vulgaris Schrad. and Cucumis melo L.) residues. The energy potential of this biomass is unclear. The aim of...
Article
The humidex and wind-chill indices were used to determine the periods in which labourers working in Almería-type greenhouses in southeastern Spain are most likely to suffer conditions able to induce heat and cold stress. Over 500,000 pieces of data for wet and dry bulb temperatures and relative humidity, recorded over a period in excess of five yea...
Article
The reduction in use of crop protection products in recent years has led to the appearance of new phytophage pests such as Nezara viridula (L.) in the greenhouses of Almería (Spain). Its biological control is, however, possible, and involves the deliberate release of the wasp Trissolcus basalis (Woll.), which parasitizes the pest's eggs. The aim of...
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The wastes generated by the intensive agriculture systems of the Province of Almería (Spain) are very varied, and they frequently cannot be directly reused; for example, mixtures of plant material and plastic raffia cannot be used as animal feed. A less indiscriminate form of management of these wastes, however, could lead to their being turned int...
Article
On 19/08/2000 it was published in the Official Gazette, the modification in the curriculum leading to the consecution of the degree in Agricultural Engineering, specializing in Agricultural and Food Industries at the University of Almeria, although its implementation did not take place until the academic year 01/02. Six years later (course 2006/200...
Article
Since ancient times, plant biomass has been used as a primary fuel, and today, with the impending depletion of fossil fuels, these vegetal sources constitute a cleaner alternative and furthermore have a multitude of uses. The aim of the pres-ent study is to design a method of recycling and reuse of plant wastes from intensive agriculture under plas...
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In gardening and more particularly in the design of gardens and urban parks, nowadays exits the necessity to introduce useful auxiliary structures for the shelter of the users to the solar radiation, at certain moments of the day. During long time, joints of classic roof garden have reproduced in all our landscaped zones, that otherwise have been r...
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The purpose of this study was to identify the effects of using aluminised screens offering different degrees of shading on the production and quality of tomato cv Atlético crops grown under greenhouse conditions. The study was performed in an Almería-type "raspa and amagado" commercial greenhouse with an area of 10,000 m2. The covering material was...
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This study investigates the use of the Labour Economics and Sociology Laboratory of France (LEST) method to analyse work posts among greenhouse workers in the Almería region of south-eastern Spain. The aim is to improve the health of the labourers. Data were gathered from 110 greenhouses, 73 of the Almería parral plano type and 37 raspa and amagado...
Article
The food dyes Tartrazine, Indigo Carmine, and Patent Blue were used as tracers to compare the deposition caused by three sequential spray applications on the same collector through multicomponent analysis of the mixture by ultraviolet‐visible absorption spectrophotometry. This methodology is quick, easy, economical, and poses no health risks, given...
Article
The food dyes Tartrazine, Indigo Carmine, and Patent Blue were used as tracers to compare the deposition caused by three sequential spray applications on the same collector through multicomponent analysis of the mixture by ultraviolet‐visible absorption spectrophotometry. This methodology is quick, easy, conomical, and poses no health risks, given...

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