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Articles by Weyessa Garedew
Total Records ( 10 ) for Weyessa Garedew
  Kidist Teshome , Adugna Debela and Weyessa Garedew
  This study evaluates the effect of different drying temperature and duration on biochemical composition and quality of black tea. In black tea processing drying is the last step and it gives quality to the brew. In Wush Wush regardless of clones, tea leaves conditions and quality of the final product; a drying temperature of 110°C for 25 min was used to dry tea leaves. Furthermore, there was little research done so far to optimize drying temperature and duration and only subjective judgment had been used by factory cup tasters to determine the optimum drying temperature and duration. Therefore, this research was conducted at Wush Wush tea plantation and JUCAVM post-harvest laboratory in the year 2012/2013 on clone 11/4 to identify the optimum combination of drying temperature and duration using five drying temperature and three drying durations. The experiment was laid out using factorial design arranged in Randomized Complete Block Design (RCBD) in three replicates. Analysis of variance indicated that there were significant differences (p<0.05) among the treatment combinations (interaction effect) for all the traits (Total brightness, Total liquid color, Thearubigin, Aroma, Flavor, Moisture content and Leaf infusion) considered except Theaflavine whose main effect was observed to be significant. Generally it was observed that as temperature increased with duration the biochemical composition and quality of black tea were decreased. From this research to produce good quality of black tea a treatment combination of 100°C with 25 min was identified as the optimum treatment combination to be used in this production and other sites who are engaged in tea production in Ethiopia.
  Olika Kitila , Sentayehu Alamerew , Taye Kufa and Weyessa Garedew
  The aim of this study was to estimate the extent of genetic variation and association among yield and yield-related traits. Forty nine Coffea arabica accessions from Limu (Jimma, Ethiopia) were tested at Agaro Agricultural Research Sub Center, Ethiopia from 2004 to 2009 in simple lattice design with two replications. Variances component method was used to estimate genetic variation, broad sense heritability and genetic advance. Association of traits was also estimated using standard method. The germplasm accessions differ significantly for most of the traits. Relatively high phenotypic (45.11 and 30.18%) and genotypic coefficient of variation (25 and 24.90%) were observed for yield and number of secondary branches in the order of magnitude. Hundred bean weight (81.13%) showed the highest heritability. Yield per plant showed significant positive phenotypic correlation with percentage of bearing primary branches (r = 0.53) while it revealed significant positive genotypic correlation with bean width (r = 0.47), fruit length (r = 0.61), hundred bean weight (r = 0.59), plant height (r = 0.28), canopy diameter (r = 0.29), leaf length (r = 0.30) and percent of bearing primary branches (r = 0.62). Over all, the study confirmed the presence of trait diversity in Limu coffee accessions and this could be exploited in the genetic improvement of the crop through hybridization and selection.
  Olika Kitila , Sentayehu Alamerew , Taye Kufa and Weyessa Garedew
  To estimate the extent of genetic diversity among Limmu Coffee collection, Coffea arabica accessions from Limu (Jimma) were planted in simple lattice design with two replications. Clustering of the 49 accessions for 22 quantitative characters was performed using the method of average linkage clustering strategy of observations. Genetic divergence between clusters was determined using the generalized Mahalanobis D2 statistics Analysis of variance indicated the presence of significant (p<0.05) variability for most of quantitative traits. However, non significant variation was observed for stem diameter, canopy diameter, internode length of stem, average length of primary branch, internode length of primary branch, number of primary branch and percentage of bearing primary branches. Moreover, clustering analysis grouped the accessions in to four genetic divergent classes. The smallest inter cluster distance (D2 = 5.24) was observed between clusters I and III while the highest and highly significant inter cluster distance (D2 = 93.74) was between cluster III and cluster IV suggesting the coffee materials among clusters were divergent from each other. Furthermore, principal component analysis indicated that about 85.74% of the variation present among accessions was explained by ten principal components. Over all, the study confirmed the presence of trait diversity in Limu coffee accessions and this could be exploited in the genetic improvement of the crop through hybridization and selection.
  Olika Kitila , Sentayehu Alamerew , Taye Kufa and Weyessa Garedew
  The aim of this study was to characterized and to estimate the extent of genetic variation and character association of organoleptic quality attributes of Coffea arabica accessions from Limu (Jimma, Ethiopia). Forty nine coffee germplasm accessions which have little or no information about their genetic variability together with two checks were planted in the field at Agaro Agricultural Research Sub Center, Ethiopia from 2004 to 2009. Simple lattice design with two replications was used in this particular study. Variances component method was used to estimate genetic variation, heritability and genetic advance. Relationship among traits was also estimated using standard method. The germplasm accessions differ significantly for most of the traits. Analysis of variance, variance components, phenotypic and genotypic associations, cluster analysis and principal components were computed for the sensorial quality attributes studied. The results depicted significant variations among coffee accessions for cup quality attributes studied, except aromatic intensity, bitterness, astringency and body. There was high phenotypic coefficient of variation for astringency and bitterness. This is in contrast to the low phenotypic coefficients of variation recorded for aromatic intensity and body. In principal component analysis, the first three principal components with eigen values greater than one explained 81.4% of the total variation. The first two principal components accounted with percent variability of 52.87 and 17.77%, respectively explained 70.64% of the total variability among the coffee germplasm. These were grouped into three genetically divergent clusters and three uncorrelated principal components. In general, our findings show that more than half percent of the Limu accessions had similar quality attributes with the standard checks. The results also confirmed the presence of variability in most quality attributes among the Limu coffee accessions and this could be exploited in the future genetic improvements.
  Tilahun Wondimu , Sentayehu Alamerew , Amsalu Ayana and Weyessa Garedew
  Forty nine anchote landrace populations collected from South and Western parts of Ethiopia were evaluated for 17 pheno-morphic and agronomic traits of yield and yield related traits in simple lattice design at Bako Agricultural Research Center during 2011 cropping season. The objectives of the study were to classify the population into relatively homogenous group and to identify the major traits contributing to the overall diversity of the population. The data were subjected to D2 analysis and the populations were clustered in to 5 different major groups according to their similarity levels and this makes the accessions to become moderately divergent. This dataset was reduced to three significant Principal Components (PCs) that cumulatively explained 93.50% of the variance. About 56.30% of the variance accounted for by the first PC alone resulted largely from the variations in contrasting effects of discriminatory traits like fruit yield per plant, fruit length, fruit weight, fruit diameter, hundred seed weight, petiole length, number of fruit per plant, leaf length, average root length, internodes length, vine length and root yield per plant. Overall, the study confirmed the presence of character diversity in anchote landraces. This assessment of traits diversity can assist geneticist and breeders to identify populations with desirable characteristics for inclusion in variety breeding program. Further evaluation at multi-location is suggested in the future.
  Abeyot Tessema , Sentayehu Alamerew , Taye Kufa and Weyessa Garedew
  The study was carried out to determine the magnitude of genetic diversity among Coffea arabica germplasm accessions. For this, twenty-one native coffee germplasm collections of six geographical areas were used for the study. The coffee genotypes were field, established in 2002 at the Jimma Agricultural Research Center, southwestern using a randomized complete block design of three replications. Ripe red coffee cherries were handpicked and prepared for laboratory determinations on quality and biochemical attributes. Analysis of variance, clusters, principal component and divergence analyses were computed. The results indicated significant (p<0.01) variations for the most coffee quality and biochemical attributes due to coffee genotypes. Cluster analysis grouped the entries into 4 different clusters. The clusters also demonstrated maximum inter- and minimum intra-variances for all the quality attributes. Moreover, the distances among the clusters were highly significant, indicating the possible superiority of heterosis from the highly divergent parents. The analysis of principal component showed four PC1, PC2, PC3 and PC4 with the respective eigenvalue of 5.11, 1.92, 1.73 and 1.16, explaining 84.41% of the total variance. This underlines that coffee breeding strategy within and among geographical areas may provide quality improvement with known origin quality profile. It can be concluded that the promising coffee germplasm collections were diverse in terms of most quality traits and biochemical constituents due to genetic factors. Thus, selection of superior coffee cultivars requires careful evaluations and characterizations for quality attributes and other desirable traits under various field management and processing techniques across locations.
  Mihretu Yonas , Weyessa Garedew and Adugna Debela
  The objective of the study was to evaluate genetic variability among Okra accessions based on quantitative morphological traits. Twenty five Okra accessions were planted in 2011/2012 at Gambella in randomized complete block design with three replications. Data on 20 quantitative traits were collected and subjected to various statistical analyses. The analysis of variance showed significant differences (p<0.01) among the accessions for all quantitative characters measured. Estimate of phenotypic and genotypic coefficients of variation also showed the presence of variability among the accessions for the majority of the character. High heritability (96.76 and 96.50%) coupled with high genetic advance as percent of mean (106.32 and 97.25%) were recorded for internodes length and plant height, respectively. Correlation study between various quantitative characters highlighted significant association among characters. Fruit yield was positive and highly significant genotypic correlation with fruit length (r = 0.74), average fruit weight (r = 0.62), fruit diameter (r = 0.61), seed per pod (r = 0.56), hundred seed weight (r = 0.68) and number of pod per plant (r = 0.66). Path coefficient analysis at genotypic level revealed that internodes number had highly positive direct effect on fruit yield (p = 6.90) followed by average fruit weight (p = 6.89) which had positively genotypic correlation with yield. The present study indicated a considerable amount of variability for the majority of the quantitative characters in Okra for exploitation. However, it is recommended that the experiment should be repeated at more location and years with more collections to confirm the obtained results.
  Mihretu Yonas , Weyessa Garedew and Adugna Debela
  Okra (Abelmoschus esculentus (L.) Moench) is an economically important vegetable crop grown in different part of Ethiopia particular in south western part of the country. The objective of the study was to evaluate genetic diversity among Okra accessions based on quantitative morphological traits. Twenty five Okra accessions were planted in 2011/2012 at Gambella in randomized complete block design with three replications. Data on 20 quantitative traits were collected and subjected to various statistical analyses. The analysis of variance showed significant differences (p<0.01) among the accessions for all quantitative characters measured. Cluster and distance analysis of quantitative characters based on multivariate analysis pointed out the existence of five divergent groups. The maximum distance was observed between cluster II and I (2846) while the minimum was between I and III (213.64). Principal component analysis indicated that six principal components explained about 83% of the total variation. Differentiation of germplasm into different cluster was because of cumulative effect of number of characters. Accessions like GM7, GM9 and GH13 from Gambella collection and AS4 and AS11 from Assosa collection are recommended for the next breeding work as they are high yielder accessions compared to the others. The present study indicated a considerable amount of variability for the majority of the quantitative characters in Okra for exploitation. However, it is recommended that the experiment should be repeated at more location and years with more collections to confirm the obtained results.
  Fikre Lemessa , Amsalu Abera , Girma Adunga and Weyessa Garedew
  Coffee (Coffea arabica L.) bean quality can be affected by a number of factors of which storage fungi are one of the major ones. In Ethiopia coffee is a number one export commodity supporting the national economy but there was little information about the association of mycoflora with coffee beans. Therefore, the objective of this study was to assess the associations of mycoflora with coffee seeds and their effect on coffee infection at Limmu Coffee Plantation. The comparison was done using two coffee berry disease resistant selections (74112 and 74110) with and without parchment and with and without surface treatment of coffee beans with 5% sodium hypochlorite and storing under two storage conditions (local cold house and corrugated iron warehouse). Thus, the experiment was laid down as 2×2×2×2 factorial experiment with four replications. The study showed the association of four fungal species (Fusarium spp., Aspergillus spp., Penicillium spp. and Mucor spp.) and some unidentified species in both blotting and agar plating techniques. In general, significantly higher infection percentage was found in coffee seeds without parchment and surface disinfection irrespective of the storage type and coffee selection. Thus, keeping coffee beans with parchment and disinfecting by disinfectants may reduce the association and prevalence of mycoflora on coffee and minimize postharvest problems.
  Zerihun Kebebew , Weyessa Garedew and Adugna Debela
  The biophysical and socioeconomic contributions of homegarden agroforestry practices are well appreciated throughout the world. This is particularly more relevant in tropical region as homegardens have been a way of life for century in the region. The present study tries to examine homegarden agroforestry practices and evaluate their significance towards household food security strategy in southwestern Ethiopia. A total of 98 homegardens (11%) were randomly selected for the study. A combination of complete plant inventory and interview were used to collect data. The result showed that the size of homegarden ranged from 0.01-1 ha with mean 0.15 ha. About 99% of the assessed homegarden were established on open areas in response to getting more food and cash to support family. Enset ventricosum, avocado, cabbage, maize, coffee, Catha edulis and banana were the most cultivated crops in the homegarden. The relative household income contribution of homegarden was found about 44.5%. Catha edulis and avocado accounted for about 72.6% of the homegarden income contribution. Income from homegarden increased an average household income from 2100-3784.11 Ethiopian Birr. A paired t testing result showed that the difference in average annual income of household due to homegarden was significant (t = 8.119, df = 97, p = 0.000). The present study revealed that contribution of homegarden goes beyond gap filling. Economic important crops dominated the homegarden. Some households were getting much benefit from their homegardens. Paying due attention to homegarden development has significant role in addressing household food security in the future.
 
 
 
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