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Endalew W.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Getahun A.,Catholic University of Leuven | Demissew A.,Institute of Chemical Technology | Ambaye T.,Amhara Design and Supervision Works Enterprise
Agricultural Engineering International: CIGR Journal | Year: 2014

A comparative study of naturally ventilated onion bulb storage structure and traditional in house floor storage was conducted in Fogera plain, Ethiopia to determine their performances. Onion bulb of Bombay Red cultivar was stored for 90 days in naturally ventilated storage structure and in house floor. The study was conducted from end of April to Jun 2011. Hourly temperature and relative humidity of ambient and storage environment were monitored and the physiological weight loss, sprouting percentage, rotting percentage and percentage of marketable bulbs on stored bulb were recorded every ten days interval. The observation has shown that the temperature profile of naturally ventilated storage structure has followed similar pattern with the ambient environment. Total percentage of bulb loss increases with storage period in both storage methods and lower values were observed in naturally ventilated structure than in house floor storage method. On the 50thday after storage, the overall bulb losses in naturally ventilated structures and in house floor storage were found to be 68.51% and 78.56% respectively. © 2014, Agric Eng Int: CIGR Journal. All rights resereved.

Teffera A.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Tekeste S.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Denekew Y.,Andassa Livestock Research Center
Livestock Research for Rural Development | Year: 2012

Hay is the oldest and most important conserved fodder. The aim of haymaking is to store feed for later on-farm use. Traditional haymaking practice in Ethiopia has many problems. Delayed or early harvesting, improper handling system during harvesting, transportation, and storage stages are identified as main causes of feed loss. This project is, therefore, intended to evaluate and demonstrate manual hay presses so as to assist users in haymaking and baling practice. Two hay press models, vertical and horizontal hay presses, were manufactured and after preliminary test, practical on field test was conducted at two sites. Besides, discussions were made with farmers and their opinions were recorded. The test result has shown that, the average pressing rate, bale density, and baling time of vertical hay press was 45.2 kg h-1, 86.5 kg m -3 and 14.1 min per piece. Likewise, similar parameters of the horizontal type were 36.9 kg hr-1, 72.3 kg m -3 and 17.4 min per piece, respectively. It was observed that most of the respondent farmers preferred vertical type press due to its lower energy requirement and better output. Therefore, the vertical hay press model is recommended for further promotion.

Tefera A.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Endalew W.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Fikiru B.,Medicine and Health Care Administration and Control Authority of Ethiopia
Livestock Research for Rural Development | Year: 2013

This study was conducted to evaluate the performance of two models of direct solar potato dryers and to demonstrate to farmers around potato producing areas, in Amhara Regional State. Wooden box dryer and Pyramid shape dryer models were evaluated. Dryers were compared with open sun drying methods. Temperature, relative humidity as well as the rate of moisture removal as expressed by loss-in-weight were recorded and analyzed. Results showed that on the average there was a 10-20 °C temperature difference between ambient condition and the drying chambers. Besides, the weight of sliced potato which was initially 0.90 kg was reduced to about 0.19 kg within two days. This showed an overall reduction in drying time by 2-3 hours compared to open sun drying. This result, however, was not perceived to be large enough under existing testing condition. But considering other benefits of the driers like protecting the drying material against contaminants, dust, and insects resulting in better quality product, this result is acceptable. On the other hand, comparing the performances of the two driers, Pyramid dryer was found better in creating more conducive drying environment with optimal temperature and lower relative humidity. Moreover, considering manufacturing costs, simplicity in design to manufacture in rural area from almost any kind of available building materials by locally available workmen, Pyramid dryer is better than Box dryer. Demonstration and practical training on the use of solar dryers and methods of food preparation out of the dried potato slices was provided for a group of farmers. Participant farmers actively participated in the potato menu preparation and informal sensory evaluation. They have showed high interest in diversified potato utilization as it enhances their feeding habits. This dryer was found suitable for drying small quantities (10-15 kg) of agricultural products which suits best for household level. Therefore, Pyramid (pyramid shape) dryer models should be recommended for further promotion.

Teffera A.,Post harvest technology researcher | Selassie Sahile G.,Bahir Dar Agricultural Mechanization and Food Science Research Center
Livestock Research for Rural Development | Year: 2011

The study was conducted from July 2006 to December 2007 at East Gojjam and West Gojjam zone of Amhara regional state, Ethiopia. The objective of the study was to evaluate and identify appropriate bee spaces for different agro ecology on farm condition. For this study three trail sites that represent the highland and lowland agro ecology areas were selected. From each sits three beekeeping farmers were selected as host farmers to carry out the study. The treatments were three Langstroth bee hives contain different bee-space (7mm, 10mm and 14mm) replicated three times at each trail site and complete randomized design (CRD) was used. The collected data were analyzed using one-way analysis of variance. Farmer's comments also included for evaluation purpose. Based on the analysis of variance and participant farmer's comments, hives with bee spaces 7mm, and 10mm were found to be useful around lowland and highland areas. It will be most convenient to use the bee hive having 7mm bee space around lowland area and bee hive having 10mm around highland areas of the region. It is also necessary to use all management aspects so as to increase honey and honey products, since, only by maintaining bee space cannot bring good return.

Biwet W.,Bahir Dar Agricultural Mechanization and Food Science Research Center | Muhabaw A.,Bahir Dar Agricultural Mechanization and Food Science Research Center
Agricultural Engineering International: CIGR Journal | Year: 2014

In most small holder farmers in Ethiopian highlands, farmers still use the wooden plow (Maresha).The present trial was conducted in 2011-2012 at Gumara Maksegint water shade, to evaluate the effect of four different tillage methods on teff and wheat yield and soil physical properties. The experiment was performed by using a randomized complete block design with four treatments and three replications. The experiment was carried out on two soil types, a sandy Nitosol prevailing in the hilly upper areas and clayey Vertisol prevailing the valleys. Land preparation by tillage was done with either a Moldboard plow, Gavin plow, or traditional plow, and was compared against ano-tillage treatment. Animal draft force, soil bulk density, penetration resistance, moisture content, and water infiltration, as well as crop yields were recorded. No statistical differencesin terms of yields were found among treatments for both soil types. On the lighter Nitosol tillage implement had significant effect on moisture content, the highest moisture content was on plots tilled with the Gavin plow and the lowest was obtained on no-till treatment. No such clear trend could be observed for soil bulk density. On the Vertisol the effect of tillage implement on moisture content and bulk density was not significant. No-till resulted in lower cumulative infiltrations as compared to Gavin and moldboard plowing, but no significant difference on yield is recorded. Therefore no- tillage can be used as an alternative tillage practice. On reduction of farm power, no-till is promising tillage practice for farmers who don’t have draft animal. However, the long-term impact of this practice on soil strength should be further studied. © 2014 Int. Comm. of Agricultural and Biosystems Engineering. All rights reserved.

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