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Articles by Kaba Urgessa
Total Records ( 2 ) for Kaba Urgessa
  Jemal Hussien , Kaba Urgessa , Fayissa Regassa , Awol Jemal , Sultan Abajebel and Nezif Hussien
  The present study was aimed at investigating the antihelmentic effects of the essential oil extracts of Coriandrum sativum Linn., Ocimum gratissimum Linn., Ocimum lamifolium Hochst. ex Benth, Ruta chalpensis Linn., Thymus schimperi Ronniger and Echinops kebericho Mesfin against H. contortus. In vitro bioassay employing the egg hatching test was conducted to determine the antihelmentic potential of the essential oils at 1, 0.5, 0.25, 0.125 and 0.0625% (v/v) concentration. The concentration of the extracts that inhibited 50% of test organisms (IC50) was determined using probit analysis of the mean percent egg hatch inhibition followed by linear regression analysis. Accordingly, the plants demonstrated inhibitory effects on hatching of eggs at all concentration levels. The mean percent inhibition at 1% conctration ranged from 81.8±0.6 (E. kebericho) to 100±0 (O. gratissimum and R. chalpensis). At each test concentration of the essential oils, the observed biological effect was statistically significant (p<0.05). Among the extracts, the essential oils of O. gratissimum (IC50 0.0784% v/v), R. chalpensis leaf (IC50 0.0876% v/v) and fruit (IC50 0.0944% v/v) were found to be the most active against H. contortus egg hatching. The intensity of egg hatching inhibitory effect of the essential oils was observed to vary in a dose dependent fashion (p<0.05) and 1% concentration of the essential oils of most of the plants investigated was generally best efficacious with comparable efficacy to the positive antihelmentic compound, thiabendazole (0.5 μg mL-1). The result indicated the potential utility of the plants in the control of egg shedding into the environment to prevent infection of new hosts during grazing. In vivo antihelmentic efficacy and toxicity studies of the plants should be established.
  Negesu Debere , Fikre Lemessa , Kaba Urgessa and Gezahegn Berecha
  A study was conducted to determine the effect of combined application of inorganic nitrogen and organic phosphorus fertilizers on growth of young tea plant (Camellia sinensis var. assamica). The field experiment was conducted in Gera district in Southwest (SW) Ethiopia during 2010/2011 and 2011/2012 cropping seasons. We used two fertilizers “Orga” and urea as sources of phosphorus and nitrogen, respectively. We tested four rates of nitrogen (75, 150, 225 and 300 kg N ha-1) combined with a constant rate of phosphorus (30 kg P ha-1) and one unfertilized control treatment. The experiment was laid down in a randomized complete block design with three replications. The results showed that combined application of inorganic nitrogen (urea) and organic P (Orga) significantly (p<0.01) enhanced plant height, number of leaves per plant, number of branches per plant, root length, leaf fresh and dry weight and root fresh and dry weight. Among the tested rates, combined application of 150 kg ha-1 N and 30 kg ha-1 P increased leaf number, plant height and branch number per plant by 164.3, 68.8 and 83.4%, respectively compared to control treatment. In conclusion, the use of inorganic nitrogen (urea) fertilizer at 150 kg N ha-1 combined with 30 kg P ha-1 (Orga) gave the best result in all assessed yield components variables and could be recommended for the study area for high yield and quality tea cultivation.
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