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Articles by Solomon Tulu
Total Records ( 5 ) for Solomon Tulu
  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.
  Israel Zewide , Ali Mohammed and Solomon Tulu
  An experiment was conducted at Masha District, Southwestern Ethiopia to investigate the effect of nitrogen and phosphorus rates on yield and yield components of potato. Four rates of nitrogen (0, 55, 110, 165 kg ha-1) and four rates of phosphorus (0, 20, 40, 60 kg ha-1) were combined in 4x4 factorial arrangement in randomized complete block design with three replications. Data collected on growth and yield parameters were analyzed using SAS 9.2 computer software. Application of 165 kg N ha-1 significantly increased days to flowering by 6 days, days to physiological maturity by 13 days, above ground biomass by 36%, underground biomass by 29.79%, total tuber yield by 60.33%, marketable tuber number by 56.36% and total tuber number by 31.7% and average tuber weight by 22.43%. However, N did not influence days to emergency, unmarketable tuber yield and unmarketable tuber number. Application of P significantly increased days to flowering by 3 days, above ground and underground biomass by 8.78% and 61.4% respectively and marketable tuber number by 19.72%. The interaction effect of 165 kg of N and 60 kg P increased marketable tuber yield (36 t ha-1) by 122% as compared to control (16.2 t ha-1). The result of this study verified that yield and yield components of potato are influenced by nitrogen and phosphorus rates. From this study, it can be concluded that the higher rates of nitrogen (165 kg ha-1) and phosphorus (60 kg ha-1) can be used for optimum production of potato variety Jalene in the study area Masha, Southwestern Ethiopia.
  Bayu Dume , Gezahegn Berecha and Solomon Tulu
  Physical and chemical properties of the biochar varied as a function of feedstock selection and pyrolysis temperatures. Biochar additions to acidic soils have the potential to improve soil fertility and crop yield. Biochar materials were produced from coffee husk and corn cob at temperatures of 350 and 500°C and characterized by their physical and chemical properties. These were mixed with acidic soil at the rates of 0, 5, 10 and 15 t ha–1 and were laboratory incubated for 2 months at ambient temperature to examine changes in soil properties. Types of feedstock used at two different pyrolysis temperatures and application rate had no significant effects on soil textural classes but showed highly significant effects (p<0.01) on soil pH, Electrical Conductivity (EC), Cation Exchange Capacity (CEC), Organic Carbon (OC), Organic Matter (OM), Total Nitrogen (TN), exchangeable cations and available phosphorous. Application of coffee husk biochar showed relatively better improvement in soil chemical properties (pH, EC, CEC, OC, OM, TN, exchangeable cations and available phosphorous) than corn cob biochar at all application rates. The highest values of chemical properties were recorded when coffee husk biochar produced at 500°C temperature was applied at a rate of 15 t ha–1. Therefore, we generated an evidence that application of biochar is very important to improve physical and chemical properties of acidic soil.
  Bezawit Mekonnen , Solomon Tulu and Jima Nego
  Field experiment was conducted to identify the most promising and adaptable sweet potato (Ipomoea batatas L.) variety. Five Orange Fleshed Sweet Potato (OFSP) varieties: variety Beletech (192026 II), Birtukanie (Saluboro), Kulfo (Lo-323), Tulla (CIP 420027) and one local variety were used as experimental treatments and arranged in randomized block design with three replications. Data collected on growth parameters were analyzed using the GLM procedure of SAS Version 9.2. Variety had highly significantly affected the growth parameters; number of branches per plant, number of leaves per plant and vine length and also significantly affected fresh weight and dry matter content of sweet potato roots. For the majority of growth parameters variety, Tulla was preferably the best variety compared to the other three improved OFSP varieties as, well as the local variety and significantly the highest number of branches per plant (41.41), vine length (99 cm), fresh weight (1.56 kg) and dry matter content (54.40%) were recorded from variety Tulla. The result of the correlation analysis also indicated that fresh weight and dry matter content of sweet potato roots were negatively and significantly correlated with number of branches per plant. This indicated that sweet potato producers targeting above ground biomass production should use number of branches and leaves per plant as selection criteria, where as those targeting sweet potato root tubers production, should use the fresh weight and dry matter content of sweep potato roots as selection criteria. Likewise, these growth parameters are important factors for selection of sweet potato and can serve as indicators of adaptability of the crop to the growing conditions of the study area. Therefore, OFSP variety Tulla (CIP 420027) can be used as the most promising and adaptable variety for optimum growth and productivity at the study area, Jimma in the Southwestern part of Ethiopia and combat VAD at community level.
  Bezawit Mekonnen , Solomon Tulu and Jima Nego
  Five orange fleshed sweet potato (Ipomoea batatas L.) varieties: four collected from Adami Tulu Agricultural Research Center and one local variety with orange flesh were evaluated at field condition to identify the highest yielding and adaptable variety. The five varieties: Beletech (192026 II), Birtukanie (Saluboro), Kulfo (Lo-323), Tulla (CIP 420027) and a local variety were used as treatments and arranged in randomized complete block design with three replications. Data collected on yield and yield contributing parameters were analyzed using the GLM procedure of SAS version 9.2. Variety had significantly affected root diameter, marketable tuberous root yield and total tuberous root yield. Significantly the highest root diameter (4.9 cm), marketable tuberous root yield (0.78 t ha–1) and total tuberous root yield (0.88 t ha–1) were obtained from variety Tulla. The result of the correlation analysis also revealed that root diameter and number of tuberous roots per plant were significantly and positively correlated with marketable and total tuberous root yield. Likewise marketable tuberous root yield was also significantly and positively correlated with total tuberous root yield. This indicated sweet potato producers targeting tuberous roots should use root diameter, number of tuberous roots per plant and marketable tuberous root yield as selection criteria. Likewise, these yield and yield contributing parameters are important selection parameters which can serve as indicators of adaptability of the sweet potato to the study area and can also be utilized for making improvement in tuberous root yield of sweet potato. Besides, yield is an important agronomic index that shows the adaptability of a variety to its growing environment and accordingly variety Tulla outperformed the three improved OFSP varieties and the local variety in yield and yield contributing parameters. Therefore, variety Tulla (CIP 420027) was identified as the highest yielding and adaptable OFSP variety under the rain fed condition in the humid tropics of Southwestern Ethiopia at Jimma and potentially combats VAD at community level.
 
 
 
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