Template-Type: ReDIF-Article 1.0
Author-Name: Harby Mostafa
Author-Workplace-Name: Agricultural and Biosystems Engineering Department, Faculty of Agriculture, Qalyobia, Egypt
Title: Influence of magnetised irrigation water on the fertigation process and potato productivity
Abstract: An experiment was conducted for two seasons on a farm in the Mit Kenana village, Qalyobia, Egypt. The aim was to study the influence of a magnetised water technology on the fertilisers during irrigation (fertigation) and its impact on the water, soil as well as the yield and yield components for potatoes. The experiment included: Normal water (NM), magnetic water (MW), adding fertiliser before (FMW) and after magnetism (MWF). The results indicated that irrigation with magnetised water and then adding fertiliser (MWF) had a positive significant effect on the water and soil properties, the tuber engineering parameters improved and the potato productivity increased by 40.5% higher than the NM method.The fertigation unit has to be installed after the magnetic device because the direct magnetisation of the water with the fertilisers contributes to the cracking and increases the solubility of the fertilisers that may lead to the possibility of leaching some of them away from the roots, which implies losing some of them and, therefore, decreasing the effectiveness of the fertilisers
Keywords: magnetisation technology, fertilisers, soil properties, plant production
Journal: Research in Agricultural Engineering
Pages: 43-51
Volume: 66
Issue: 2
Year: 2020
DOI: 10.17221/1/2020-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/1/2020-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-202002-0001.txt
Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:1-2020-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: P. Trávníček
Author-Workplace-Name: Department of Agricultural, Food and Environmental Engineering, Faculty of Agronomy, Mendel University in Brno, Brno, Czech Republic
Author-Name: I. Vitázek
Author-Workplace-Name: Department of Transport and Handling, Slovak University of Agriculture in Nitra, Nitra, Slovakia
Title: Uncertainty estimation of the mean specific heat capacity for the major gases contained in biogas
Abstract: The paper is focused on the uncertainty estimation of the mean isobaric and isochoric specific heat capacity calculation. The differences in the data among the individual sources for the technical calculation are presented in the first part of the paper. These differences are discussed in this paper. Research of scientific work with listed values of measurement uncertainties has been carried out in the second part of the paper. Furthermore, mathematical models were calculated which describe the dependence of the specific heat capacities and temperature. The maximal error models were carried out. Two approaches were used for the calculation of the mean specific heat capacity. The first approach is the calculation with help of integration of the function which describes the dependence of the specific heat capacity and temperature. The second approach is the calculation of a simple arithmetic mean of the specific heat capacity related to the maximal and minimal value of the temperature interval. The conclusion of the work shows that the time-effective second way is applicable in the case of a narrow temperature range. A value of 5.5% (Δt = 200 K) was reached for the relative uncertainty. This is a similar value to that in the case of using the first way.
Keywords: enthalpy, energy, mathematical model, error models
Journal: Research in Agricultural Engineering
Pages: 52-59
Volume: 66
Issue: 2
Year: 2020
DOI: 10.17221/4/2020-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4/2020-RAE.html
File-Format: text/html
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Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:4-2020-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: Tamara Skoblo
Author-Workplace-Name: Department of Technological Systems of Repair Production, Educational and Research Institute of Technical Service, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Author-Name: Ivan Rybalko
Author-Workplace-Name: Department of Technological Systems of Repair Production, Educational and Research Institute of Technical Service, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Author-Name: Aleksandr Tihonov
Author-Workplace-Name: Department of Technological Systems of Repair Production, Educational and Research Institute of Technical Service, Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, Ukraine
Author-Name: Taras Maltsev
Author-Workplace-Name: Laboratory of Ionizing Control Methods, State Enterprise "Malyshev Plant", Kharkiv, Ukraine
Title: Evaluation of the stress state of a cultivator blade in production and operation
Abstract: The aim of the work was to determine the quality of a new and used cultivator blade to assess the condition of the metal with the development of rejection norms of its variability in a magnetic parameter - coercive force using various types of equipment - coercimeters. The new cultivator blade shows the highest level of coercive force that is characteristic of its right and left parts and its decrease occurs towards the toe. After operation, variability is noted, characterised by both an increase and a decrease in the indicators of the coercive force. Rejection norms of the metal state, which determine the possibility of restoring a worn cultivator blade, which can also provide satisfactory indicators for their further use in operation, have been proposed. For restoration, it is recommended to use a cultivator blade made of low carbon steel, the zones of which should not change the level of the coercive force > 10.0% during operation. It is not recommended to restore those blades in which, after increasing the indicators, they then decreased to (< 5.0%) and are characterised by close values of the indicators.
Keywords: agricultural machinery, uniformity, metal degradation, rejection norms, coercive force
Journal: Research in Agricultural Engineering
Pages: 60-65
Volume: 66
Issue: 2
Year: 2020
DOI: 10.17221/8/2020-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/8/2020-RAE.html
File-Format: text/html
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Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:8-2020-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: Erick Kiplangat Ronoh
Author-Name: Christopher Luchebeleli Kanali
Author-Workplace-Name: Department of Agricultural and Biosystems Engineering, School of Biosystems and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
Author-Name: Samuel Njuguna Ndirangu
Author-Workplace-Name: Department of Agricultural and Biosystems Engineering, School of Biosystems and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
Title: Effectiveness of an evaporative charcoal cooler for the postharvest preservation of tomatoes and kales
Abstract: The preservation of fresh produce can provide rural households with better diets all-year round and income by reducing their deterioration. Promotion of low-cost temporary storage technologies requires evidence of their effectiveness to attain conducive conditions. Therefore, this study was conducted to assess the effectiveness of an evaporative charcoal cooler for the preservation of tomatoes and kales. The cooler microclimate and outdoor conditions were investigated by measuring the air temperature and relative humidity. During the study period, the maximum temperature difference between the cooler and the outdoors was found to be 9.2 °C while the maximum relative humidity difference was 36.8%. Due to the presence of light rain and, consequently, low solar radiation, the temperature and relative humidity differences were significantly reduced. Despite the light rain, the cooler still registered a maximum relative humidity of 83.5% and a maximum cooling efficiency of 91.5%. Overall, the cooler demonstrated promising results in terms of favourable microclimate conditions, the shelf-life and colour changes for tomatoes and kales.
Keywords: cooling, efficiency, fresh produce, quality, storage
Journal: Research in Agricultural Engineering
Pages: 66-71
Volume: 66
Issue: 2
Year: 2020
DOI: 10.17221/52/2019-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/52/2019-RAE.html
File-Format: text/html
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Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:52-2019-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: Nurudeen Samuel Lawal
Author-Workplace-Name: Department of Agricultural Engineering, College of Engineering and Environmental Studies, Olabisi Onabanjo University, Ogun State, Nigeria
Author-Name: Kolawole Ogedengbe
Author-Workplace-Name: Department of Agricultural and Environmental Engineering, University of Ibadan, Oyo State, Nigeria
Author-Name: Olukayode Omotayo Smith Ojo
Author-Workplace-Name: Department of Civil Engineering Science, Faculty of Engineering and the Built Environment, School of Civil Engineering and the Built Environment, University of Johannesburg, Johannesburg, South Africa
Author-Name: Abubakre Adeyanju Odufowokan
Author-Workplace-Name: Department of Agricultural Engineering, College of Engineering and Environmental Studies, Olabisi Onabanjo University, Ogun State, Nigeria
Title: Assessment of a submerged membrane bioreactor with composite ceramic filters for cassava wastewater treatment
Abstract: Cassava processing activity is characterised by the generation of an enormous quantity of toxic wastewater with detrimental effects on the environment if disposed of without adequate treatment. To alleviate this concern, lab-scaled cylindrical-shaped composite ceramic filters produced from rice husk and clay mixed with equal proportions of activated carbon, kaolin and sherd powder were produced and assessed in a membrane bioreactor. The permeate obtained from the filter with 2.39% rice husks, 0.95% activated carbon, 0.80% kaolin, 0.40% sherd powder and 95.47% clay gave the optimum pollutant removal efficiency. The average removal efficiencies of the chemical oxygen demand (COD), biochemical oxygen demand (BOD), turbidity and hydrogen cyanide (HCN) were 98.32, 78.93, 37.81 and 56.52%, respectively. The pH increased from 3.8 to a maximum value of 6.5. The flux ranges from 0.005 [m3.(m2.d-1)] to a maximum value of 0.108 [m3.(m2.d-1)] obtained for the filter with 1.45% rice husks. The availability of low-cost construction materials and the ease of operation makes the concept a promising option for treating cassava wastewater, however, an optimisation study is required to improve the filter performance and enhance the field applications.
Keywords: rice husk, environment, clay, environmental pollution, activated carbon
Journal: Research in Agricultural Engineering
Pages: 72-79
Volume: 66
Issue: 2
Year: 2020
DOI: 10.17221/109/2018-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/109/2018-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-202002-0005.txt
Handle: RePEc:caa:jnlrae:v:66:y:2020:i:2:id:109-2018-RAE