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Articles by Adugna Debela
Total Records ( 7 ) for Adugna Debela
  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.
  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.
  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.
  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.
  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.
  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.
  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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