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Articles by Ali Mohammed
Total Records ( 6 ) for Ali Mohammed
  Kirubel Getachew , Nigussie Kassa and Ali Mohammed
  The study was conducted to investigate the effect of different heights, stages of shoot bending and flower bud removal from the bent stem on the quality of rose cultivar “Lovely Jewel” at Ziway, Ethiopia. From the conducted study, a highly significant interaction effect was noticed from bending height and flower bud removal on stem length. Accordingly, bending at junction and the removal of flower buds from the bent stems resulted in the longest stem. In response to the stem thickness, differences being observed among bending heights and bending stages. Consequently, bending at junction and bending after the flower bud showed color provided highest thick stems, respectively. Two way interactions of bending height and flower bud removal as well as bending stage and flower bud removal was also noticed on bud length. Bending at junction combined with flower removal showed the maximum bud length. The bending position, stage and flower bud removal had highly significant effects on bud width. As a result, bending at junction when the bud shows color with removed flower gave the maximum bud width. The maximum vase life was obtained from bending above 2nd bud. In a similar manner, removal of flowers from bent stem performed best in terms of maintaining the lasting quality. Thus, from the experiment a combination of bending at junction after the flower bud showed color with the removal of flowers being proved to be better than all the other combinations for most of the parameters. However, further researches in line with the yield and economic aspects should be conducted to give concrete recommendations.
  Ali Mohammed , Wosene Gebreselassie and Tigist Nardos
  Coffee (Coffea arabica L.) is primarily propagated by seedlings and produced directly from seeds. Effective Microorganisms (EM) has been used for the purpose of improving the germination of different crops. This study was initiated to assess the effect of EM on emergence and subsequent growth of coffee seedlings in different potting mix as a media for growth. The study was conducted in Jimma, Ethiopia from November 2011 until June 2012. The experimental units were laid out in a 5x3 factorial arrangement with Randomized Complete Block Design with three replications. The EM seed treatment had five levels of soaking h (3.5, 4.5, 5.5, 6.5 h and soaking in pure water for 72 h) while the potting mixes had three proportions of Forest Soil (FS) and EM Compost (EMC): (100% FS, 75% FS: 25% EMC and 50% FS: 50% EMC). The highest (76.47%) emergence was recorded from forest soil and EM compost mixture of 75:25 and seeds soaked in pure water for 72 h. Forest soil combined with a 4.5 h soaking of coffee seeds in EM solution resulted in the largest seedling height, number of primary branches and total dry matter. According to this study, EM solution may not be preferred than soaking in water as far as hastening of emergency is concerned. However, the use of forest soil as a pot media and soaking coffee seeds in EM solution for 4.5 h results in a relatively vigor coffee seedlings for transplanting.
  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.
  Israel Zewide , Ali Mohammed and Solomon Tulu Tadesse
  Background: Potato (Solanum tuberosum L.) was introduced to Ethiopia in 1858 and 70% of Ethiopian land, mainly in the highland is suitable for potato growing. Despite this the national average yield is only 8.2 t ha–1. Low soil fertility especially N and P deficiency is the major constraint limiting potato yield in Ethiopia in general and Southwestern part in particular. Concomitantly, there is insufficient site specific information on how much fertilizer to apply on different soil types with patch of high and low fertility. Therefore, this study was conducted to determine area specific N and P rates for optimum potato growth, quality tuber production and improved N and P content of the soils of the study area. Materials and Methods: Four rates of N at 0, 55, 110 and 165 kg ha–1 and P at 0, 20, 40 and 60 kg ha–1 combined in factorial arrangement and laid out in RCBD with three replications. Data collected on potato growth, tuber quality, TN and available P content of the soil after potato harvest were analyzed using SAS version 9.2. Results: The interaction of 165 kg N ha–1 and 20 kg P ha–1 increased plant height by 51% over the control. Besides, 165 kg N ha–1 increased TN contents of the soil by 95% and available P by 42%. Plant height was positively and significantly correlated with soil TN (r = 0.55) and available P content (r = 0.68). Similarly, tuber dry matter content was positively and significantly correlated with tuber specific gravity (r = 0.94) verifying tuber dry matter is an indicator of tuber specific gravity. Conclusion: The present results indicated potato growth, tuber quality, TN and available P content of the soil were affected by N and P rates. The lower and medium N and P rates were favoring potato tuber quality parameters while, the higher N and P rates were favoring potato growth, TN and available P content of the soil. Therefore, the combined application of 165 kg N and 60 kg P ha–1 is required for optimum growth of Jalene potato variety and improved TN and available P content of the soils of Masha district.
  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.
  Ebrie Yimam , Amsalu Nebiyu , Ali Mohammed and Merkebu Getachew
  Field experiment was conducted at Duka, Konta district to determine the effect of Nitrogen (N) and Phosphorous (P) fertilizers on growth, yield and yield components of black cumin. Five levels of N (0, 15, 30, 45 and 60 kg ha–1 in the form of urea) and three levels of P (0, 20, 40 kg ha–1 in the form of TSP), arranged in RCB design with three replications. Results indicated that interaction of N and P highly significantly (p<0.01) influenced the different growth and yield parameters except for 1000 seed weight. The highest seed yield (1336.7 kg ha–1 was obtained from 60/40 kg N P ha–1. Highest number of pods per plant (45.9) was obtained from 60 kg N ha–1 and 40 kg P ha–1 interactions. The tallest plants (72.5 cm) were measured o plots fertilized at the rate of 60/40 kg N P ha–1. The highest number of branches (46.1) was obtained from the interaction effect of 60/40 kg N P ha–1. The highest numbers of seeds per pod (91.6) was achieved at treatment combination of 60/40 kg N P ha–1 followed by 88.4 seeds by the treatment combination of 60/20 kg N P ha–1. The highest harvest index (20.8%) was obtained from the treatment that received 60/40 kg NP followed by 20.5%, which received 45/20 kg, N P ha–1 interactions and the lowest harvest index (15.1%) was recorded from the treatment that received 15 and 0 kg NP interaction. The longest days to 50% flowering (86.7 days) were observed for the treatment that received 60/40 kg N P ha–1. However, the shortest flowering days (75.5) days were for the control treatment. Partial budget analysis has shown that two treatment combinations of (NP ha–1) were found to be economically viable with marginal rate of revenue beyond the minimum acceptable level (150%). The highest MRR (%) was obtained with the interaction effect of 45/40 kg NP ha–1 with marginal rate of revenue (1272.2%) for net benefit 15254.1 birr, followed by the interaction effect of 15/20 kg NP ha–1 with marginal rate of revenue (485%) for net benefit 10325 birr over the control with a net benefit 8595.0 birr. Since the experiment was conducted at one place and only for one cropping season, it will not be appropriate to arrive at a strong recommendation. However, as a recommendation, growers can be advised to use a combination of 45/40 kg NP ha–1 followed by 15/20 Kg N P2O5 ha–1 for black cumin production in the area.
 
 
 
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