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Articles by Derbew Belew
Total Records ( 13 ) for Derbew Belew
  Daba Mengesha , Derbew Belew , Wosene Gebreselassie and Waktole Sori
  Among the major root and tuber crops, anchote is a potential crop produced in West Wollega zone of Ethiopia. It serves as a food, cultural, social and economical crop for the farming communities. Due to the lower attention given to the research and development of anchote, there is no variety so far developed and released. Ten promising anchote accessions were tested at Jimma and Ebantu from June 2010 until October 2010 to determine agronomic performance of the accessions. The experimental design was a randomized complete block design with three replications. The results indicated that yield and yield components were significantly (p<0.05) higher for the majority of the accessions under Ebantu than Jimma condition. The highest total biomass, 19.13 kg per 4 m2 plot, was obtained at Ebantu from accession 223098 while the maximum total biomass at Jimma was only 11.69 kg per 4 m2 plot that was obtained from accession 223087. Almost all accessions took longer average time (128 days) to reach 90% maturity under Ebantu condition than Jimma which took 109 days on average. The maximum storage root yield (76.45 t ha-1) was observed for an accession No. 223098, under Ebantu condition, while, the lowest yield was obtained from accession No. 240407 (51.54 t ha-1) under Jimma condition. The highest mean dry matter (30%) was obtained under Ebantu condition for almost all accessions. On the other hand, the lowest mean dry matter (20%) was obtained under Jimma condition. From this study the six accessions 223109, 223087, 223098, 223096, 90802 and 229702 produced better storage root yield, high dry matter content, high biological yield across the two environments indicating a good performance and adaptation. Therefore, these accessions are suggested to farmers in areas of Jimma, Ebantu and with other areas of similar agro-ecological zones.
  Kokobe W. Yohannes , Derbew Belew and Adugna Debela
  A field experiment was conducted at Jimma University College of Agriculture and Veterinary Medicine research field from October 2011 to March 2012 under irrigation to assess the response of onion to farmyard manure and nitrogen fertilizer rates. The study consisted of four levels of FYM (0, 15, 30 and 45 ton FYM ha-1) and four levels of nitrogen (0, 50, 100 and 150 kg N ha-1). The experiment was arranged in 4x4 factorial arrangements in a randomized complete block design with three replications. Data on growth, yield and quality parameters were recorded and analysed using SAS Computer Software version 9.2. Results revealed that interaction of FYM and N fertilizer significantly (p<0.05) influenced Plant height, number of leaves, leaf length, maturity, average bulb weight, total yield, marketable yield; harvest index and bulb dry matter. However, leaf diameter, bulb length, bulb diameter and unmarketable yield were not affected by the combined application of FYM and N fertilizer. The findings highlighted that the performance of onion at Jimma area can be enhanced through application of FYM and N fertilizers. The highest bulb yield of onion (36.85 ton ha-1) was obtained when the plots received combined application of 100 kg ha-1of N and 45 ton ha-1 of FYM which significantly increased the total bulb yield by about 53% as compared to the unfertilized plot (17.45 ton ha-1). This however, was statistically similar with the combined application of 150 kg ha-1of N and 30 ton ha-1of FYM and also150 kg ha-1 of N and 45 ton ha-1 of FYM. In this study, maximum dry bulb yield of onion (33.30 ton ha-1) was obtained when the plots received combined application of 150 kg ha-1 of N and 30 ton ha-1 of FYM. Therefore, from statistical point of view and labour requirements to prepare and apply FYM, a combined application of FYM at 30 ton ha-1 and nitrogen fertilizer at 150 kg ha-1 rates can be considered optimum for obtaining high onion bulb yield at Jimma area.
  Tesfaye Getachew , Derbew Belew and Solomon Tulu
  Field experiment was conducted to investigate the effect of intra row spacing and time of earthing up on growth and yield of potato (var. Jalene). Four intra row spacing: 10, 20, 30 and 40 cm and four times of earthing up: At 15, 30, 45 days after plant emergence and no earthing were combined in a 4x4 factorial arrangement in randomized complete block design. Data collected on growth and yield parameters were analyzed using SAS version 9.2. Intra row spacing highly significantly affected all the growth parameters: days to 50% flowering and maturity, plant height and spread, stem diameter and leaf area and all yield parameters: Tuber number, total and marketable tuber yield. For majority of growth and yield parameters 40 and 30 cm intra row spacing was preferable, while significantly the highest marketable tuber yield of 23.54 t ha-1 was produced at 30 cm intra row spacing. The effect of time of earthing up was found highly significant on all growth parameters studied: days to 50% flowering and maturity, plant height and spread, stem diameter, leaf area and main stem number and all yield parameters studied: Tuber number, total and marketable tuber yield. Earthing up at 15 days after plant emergence showed superior performance in most growth and yield parameters. Therefore, 30 cm intra row spacing and earthing up at 15 days after complete plant emergence can be used at the study area, Boneya in Degem district for better growth and higher marketable yield of potato.
  Shushay Chernet , Derbew Belew and Fetien Abay
  The aim of the study was to estimate the extent of genetic variability and association among characters. Thirty six tomato genotypes were evaluated at Humera Agricultural Research Center, Northern Ethiopia, during 2010/11 in 6x6 simple lattice design with two replications. Variance component method was used to estimate genetic variance, heritability and genetic advance. Highly significant difference (p<0.01) was observed among the tested genotypes for all the characters studied. Highest phenotypic (79.13 and 74.66) and genotypic coefficient of correlation (78.47 and 73.27) were observed for number of matured fruits per plant and fruit set percentage. The highest heritability estimate was recorded for number of matured fruits per plant (98.34) and the least for number of primary branches (47.36%). Yield per hectare had highest positive and highly significant phenotypic correlation with weight of fruits per plant (rp = 0.89), fruits per plant (rp = 0.85) and fruit set percentage (rp = 0.78). While it showed negative and highly significant phenotypic correlation with days to 50% fruiting (rp = -0.78) and days to maturity (rp = -0.68). The study generally, revealed the presence of adequate variability which can be exploited through direct selection or hybridization.
  Teshome Ashagrie , Derbew Belew , Sentayehu Alamerew and Yehenew Getachew
  A field experiment was conducted at Sirinka Agricultural Research centre Kobo sub center research field during the 2012/2013 under irrigation condition with the objective of assessing the effect of different planting time (October 25, November 5 and November 15) and mother bulb sizes (2-3, 3.1-4 and 4.1-5 cm) on onion seed yield and quality. The study was conducted by using 3x3 factorial design with three replications. Data was collected on growth, yield and quality parameters and analyzed using SAS version 9.2 statistical software. The results of the study showed significant interactions between mother bulb size and planting time on days to 50% flowering, scape diameter (cm), seed yield per plant (g), seed yield per hectare (kg) and germination index. The maximum seed yield (1155.73 kg ha-1) was obtained from large bulbs planted on October 25 while the least (75.15 kg ha-1) from small bulbs planted on November 15. In terms of germination index, the highest (6.03) was obtained from the large bulbs planted on October 25, whereas the lowest germination index (3.37) was from small bulbs planted on November 15. Early planting on October 25 increased germination percentage by 39% than the last planting 15 November. Regarding mother bulb size, large bulbs increased germination percentage by 13.32% than the small bulbs. Correlation coefficient indicated that umbel diameter, seed number per umbel, seed weight per umbel and seed yield per plant were found to have positively and highly significantly correlated with seed yield per hectare. Therefore, based on the findings of the current study, early planting (October 25) of large bulbs (4.1-5 cm) can be used for high yield and better quality of onion seeds. Considering the above mentioned results, it would be advisable to further investgated the seed production potential of different onion types at different locations over years so as to come up with best recommendation. In addition, plant spacing, fertilizer rate and storage methods of onion seed could also be considered. Furthermore, the seed quality performance of imported and locally produced onion seeds could be investigated to promote the onion seed industry.
  Seleshi Delelegne , Derbew Belew , Ali Mohammed and Yehenew Getachew
  A field experiment was conducted at two locations under Jimma condition with the aim of investigating the performance of different varieties of hot pepper for growth, dry pod yield and quality, thereby, to recommend best adapting and high yielding variety/varieties for the farmers in the study area. The study was conducted from October 2009-March 2010, at JUCAVM experimental field and Seka Chokorsa woreda under irrigated condition using nine hot pepper varieties (Mareko fana, Bako local, Melka zala, Weldele, Melka shote, Oda haro, Dube medium, Dube short) and one local (Gojeb local) as a control. The experiment consisted of two factors (location and variety) and was laid out in a split-plot arrangement in a randomized complete block design with three replications. The result of the study showed significant interactions between location and varieties on days to 50% flowering, days to first harvest, mean number of flowers per plant, canopy diameter, mean number of branches (primary, secondary and territory), shoot and root dry weight (g), number of fruit per plant, number of seed per fruit, mean seed weight per fruit, marketable, unmarketable and total yield (t ha-1), fruit dry weight (g), pericarp thickness, fruit length and fruit diameter. As a result, the earliest variety to attain days to 50% flowering was Gojeb local at Kechema site followed by Mareko fana at both locations. The variety to attain shortest days to first harvest was recorded from variety Gojeb local while the highest number of fruits per plant was from Weldele at Kechema site. On the other hand the highest primary, secondary and tertiary branches were recorded from variety Weldele at Kechema site. Similarly the thickest fruit size was obtained from Mareko fana at Kechema site, whereas, the widest fruit diameter was recorded from Mareko fana, Bako local, Dube medium and Dube short at Kechema site, respectively. The highest marketable yield (t ha-1) of hot peppers was recorded from Varieties Weldele, Mareko fana, Dube medium and Dube short at JUCAVM and Kechema, respectively while the highest total yield (t ha-1) was recorded from Weldele and Mareko fana at both locations. The high yielding capacities were attributed to their early flowering and maturity, days to first harvest, high marketable and total yield, dry weight content of the varieties as well as their reaction to disease.
  Bewket Getachew Bekele , Derbew Belew and Tesfaye Abebe
  Background and Objective: Potato (Solanum tuberosum L.) is one of an important food and cash generating crop in the northwestern parts of Ethiopia and particularly of Awi zone where it is grown three times per annum. However, its productivity is very low since, separate use of fertilizer, absence of balanced fertilizer and no recommendation on integrated use of organic and inorganic fertilizers for the area. The aim of study was to investigate the best combination of blended NPSZnB fertilizer and cattle manure for the better production of potato. Materials and Methods: For this purpose, an experiment was conducted at Banja district, Awi Zone during rainy season of 2017. Four different levels of blended NPSZnB fertilizer (0, 65.7, 133 and 199 t ha1) and four levels of cattle manure (0, 10, 20 and 30 t ha1) were factorially combined and tested for effect on the yield and yield component of potato in a randomized complete block design (RCBD). Results: Results of analysis of variance revealed that significant effect of treatments on marketable and total tuber yield and total dry biomass yield. The combined application of 199 kg ha1 blended NPSZnB fertilizer and 30 t ha1 cattle manure significantly affected the indicated parameters. However, marketable tuber number and total tuber number were significantly affected by blended NPSZnB fertilizer (199 kg ha1) alone, Harvest index (%) and total dry biomass were significantly affected by cattle manure (30 t ha1) alone, while average tuber weight was significantly affected by blended NPSZnB fertilizer (199 kg ha1) alone and cattle (30 t ha1) manure alone but not interaction. Conclusion: Application of 199 kg ha1 blended NPSZnB fertilizer level with 30 t ha1 cattle manure should be used for better yield and yield component performance of dagim potato variety at study area.
  Bikila Akassa , Derbew Belew and Adugna Debela
  A study was conducted to determine the effect of inter and intra row spacing on potato (Solanum tuberosum L.) seed and ware tuber emergence and subsequent growth in 2011/12 production season. The experiment was laid out in a 6x3 factorial combination arranged in a randomized complete block design with three replications (Six levels of inter: 60, 65, 70, 75, 80 and 85 cm and three levels of intra row spacings: 20, 30 and 40 cm). Most of the variables collected in this experiment were significantly affected by inter, intra and/or their interactions except the number of main stem which did not show any change as the result to change of these treatments. Though most of the variables considered require wider spacing, it was observed that an indefinite increase in the space between plants and rows did not result to an increase in any of the variables apart from extending days to flowering and maturity. For the optimum emergence and successful growth of potato tubers for both seed and ware, spacing of 70-75 and 20-30 cm between plants and rows, respectively were identified as the best combination to be used in the study area.
  Ketema Balcha , Derbew Belew and Jima Nego
  An experiment was conducted at Jimma University College of Agriculture and Veterinary Medicine (JUCAVM) experimental field to evaluate selected tomato (Lycopersicon esculentum Mill.) varieties for their seed yield under irrigated condition. The experiment was set using a Randomized Complete Block Design (RCBD) with three replications wherein nine tomato varieties: five determinate type (Bishola, Chali, Cochoro, Fetan and Melkasalsa) and four semi-determinate type (Metadel, Miya, Melkashola and Arp tomato d2) and one local variety (Roma VF) were used. Data was collected on yield, seed weight per fruit, seed weight per plant, seed yield per hectare, number of seed per fruit, thousand seed weight, fruit diameter, fruit weight per plant and fruit yield per hectare. The results revealed that Variety had highly significantly (p≤0.01) affected the yield and yield component parameters. Significantly the highest fruit diameter (6.25 cm) was recorded from variety Bishola whereas the lowest seed yield per hectare was obtained from Fetan (58.1 kg). Correlation analysis also indicated that Seed weight per plant was significantly and positively associated with seed weight per hectare (r = 0.95), fruit yield per hectare (r = 0.40) and fruit weight per plant (r = 0.40). Fruit weight per plant was highly significantly and positively correlated with seed weight per hectare (r = 0.47) and fruit yield per hectare (r = 0.99). The tomato variety Bishola was found to be high seed yielder as compared to the other varieties compared and hence it is suggested that tomato producers in Jimma area can use Bishola variety for high seed yield.
  Bikila Akassa , Derbew Belew and Adugna Debela
  An experiment was conducted at Bako Agricultural Research Centre in the production season of 2011/12 with the purpose of identifying the best combination of inter and intra row spacings for the optimum production of potato (Solanum tuberosum L.) seed tuber with marketable size and good flour quality. Six levels of inter (60, 65, 70, 75, 80 and 85 cm) and three levels of intra row spacings (20, 30 and 40 cm) were used in 6x3 factorial combination arranged in a randomized complete block design with three replications. Most of the observed variables were significantly affected due to the variation in the treatment combination between inter and intra row spacings. Narrow spacings shifted seed tuber distribution from larger to the smaller and undesirable tubers considered from marketable point of view. Though, total yield increased under narrower spacing conditions, marketable tubers are more promising for encouraging farmers to continually produce seed tubers. These therefore require relatively wider spacing to have more number of marketable size tubers. To achieve this, the study identified 70-75 cm inter and 20-30 cm intra row spacing as the best spacing combination for optimum yield and good quality potato seed tuber.
  Biniam Adugna , Derbew Belew and Negussie Kassa
  Experiments were conducted to assess the effect of selected pulsing solutions on the days to flower bud shrinkage, leaf wilting and petal edge drying occurrence of carnation cultivars (Green-Go and Galy). The pulsing solutions used for this investigation were Silver Thiosulfate (STS) (0.2, 0.6, 1 mM) and also ethanol (6, 8, 10%), both received equal amount of sucrose (10%). Besides, to simulate the actual practice of the farm (0.4 mM Silver Thiosulfate (STS) plus 0.3 mM T.O.G®) was used as a standard control. Senescence symptoms such as flower bud shrinkage, petal edge drying and leaf wilting were monitored. The results obtained showed that 1 mM STS plus 25 g sucrose achieved rapid petal edge drying for Green-Go cultivar. On the other hand, positive effects were also observed in days to flower bud shrinkage extended by 6 mM Silver Thiosulfate (STS) plus 25 g sucrose and being in par with 8% ethanol plus 25 g sucrose for Green-Go cultivar. Subsequently, the standard control, 0.6 mM Silver Thiosulfate (STS) plus 25 g sucrose and 8% ethanol plus 25 g sucrose attended comparable increment on the days to leaf wilting occurrences.
  Maru Ayenew , Derbew Belew , Ali Mohamed and Wondyifraw Tefera
  A study was conducted at Jimma (southwest Ethiopia) to develop simple method of estimating the optimum harvest time of fruits of six avocado cultivars. Fruit samples were collected six, seven, eight and nine months after flowering. At each harvest, physical measurements of the fruit samples were recorded and the fruit length-to-width ratio (L w-1), fruit weight-to-length ratio (m L-1) and equivalent diameter (d) were determined. The fruit samples were then allowed to ripe at ambient conditions. The dry matter and oil contents of the juice made from the ripe fruits were determined at each harvest date for respective cultivars. Oil content was highly significantly (p<0.001) influenced by the cultivars and harvesting dates compared. Dry matter content of fruits significantly differed among cultivars (p<0.05) and harvesting dates (p<0.01). Increased oil and dry matter contents were observed towards the later harvest dates. The cultivar Bacon recorded the highest mean oil content ( = 19.44±0.73%) while the lowest was obtained from the cultivar Pinkerton ( = 15.30±0.73%). The results revealed that harvest date could be a more reliable index of optimum maturity. No significant relationship was found between oil and dry matter contents; and the length-to-width ratio and the equivalent diameter. However, a significant correlation (α = 0.01) was observed between the oil content and the fruit weight-to-length ratio (m L-1) at various stages of maturity. This physical parameter could be used as a simple method (maturity index) for the determination of time of harvest for optimum oil content of avocado fruit.
  Biniam Adugna , Derbew Belew and Negussie Kassa
  Carnation (Dianthus caryophyllus L.) is very sensitive to external and self generated ethylene. Pulsing with silver thiosulfate (STS) solutions is now widely used commercially. However, silver thiosulfate (STS) solutions contains silver ion which is a potent environmental pollutant. On the other hand, ethanol solution pulsing has been found to be effective in inhibiting ethylene biosynthesis and environmentally safe. Thus, this study was conducted to assess the effect of selected pulsing solutions on the days to bent neck, complete flower bud opening, and flower bud shrinkage occurrence of carnation cultivars (Green-Go and Galy) at Addis Alem, Schecter Yosef Flower Farm and Central Ethiopia. The experiment was laid out in a factorial arrangement with a Complete Randomized Design (CRD) consisting of three replications. The pulsing solutions used for this investigation were silver thiosulfate (STS) (0.2, 0.6 and 1 mM) for 6 h and ethanol (6, 8 and 10 %) for 3 h, both received equal amount of sucrose (10%). In addition, existing practice of the farm (0.4 mM silver thiosulfate (STS) plus 0.3 mM T.O.G®) was used as a standard control. The recorded trials included complete flower bud opening, flower bud shrinkage and bent Neck. Accordingly, the days to complete flower bud opening was prolonged by 0.6 mM silver thiosulfate (STS) plus 25 g sucrose (8.47 days). The days to flower bud shrinkage extended by 0.6 mM silver thiosulfate (STS) plus 25 g sucrose (26.42 days) and being in par with 8% ethanol plus 25 g sucrose (25.39 days) for Green-Go cultivar. Furthermore, days to complete flower bud opening showed a direct association with days to flower bud shrinkage occurrence.
 
 
 
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