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Journal of Natural Sciences Research
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  This is an Open Access Journal Open Access journal
ISSN (Print) 2224-3186 - ISSN (Online) 2225-0921
Published by IISTE Homepage  [37 journals]
  • Journal coverpage

    • Authors: Journal Editor
      Abstract: Journal coverpage
      Issue No: Vol. 13
  • Determination of Optimum Nitrogen and Phosphorus Fertilizer Rates on Bulb
           Yield of Onion (Allium cepa L.) at Bako, Western Oromia, Ethiopia

    • Authors: Negash Teshome Isho
      Abstract: Field experiment was conducted to evaluate bulb yield of onion (Allium cepa L.) under different levels of nitrogen and P2O5 for two years (2013-2014) at Bako, Western Oromia. Treatments comprised of three levels of nitrogen (46, 92, 138 kgha-1) and three levels of P2O5 (46, 92,138 kgha-1) and including check 0, 50 and 0,100 kgha-1 P2O5 and nitrogen respectively. The experiment was designed in RCBD and replicated three times. The variety bombe red is used as test material. Fertilizer rates were applied in split applications two times for nitrogen and once for P2O5. Combined analysis of variance showed as highly significant differences were observed among the treatments. So, an optimum fertilizer rates for nitrogen & P2O5 which gave the highest marketable bulb yield ha-1 was recommended for the study area and for similar agro-ecologies. The result showed that application of nitrogen significantly increased the average bulb yield of red bulb onion after harvest but application of the main effect P2O5 alone, year * nitrogen, year * P2O5 and year * P2O5 * nitrogen has no significant effect on bulb yield of onion. The interaction of 138kgha-1 P2O5 with 138kgha-1nitrogen can significantly increases total bulb yield of onion (28.07 tha-1) and recommended for the study area. Besides, it is possible to produce and obtain reasonable bulb yield of 20.58 tha-1 bulb onion with the interaction of 92kgha-1nitrogen and 92kgha-1 P2O5. During vegetative growth stage and at its maturity it was observed that there is disease reaction of purple blotch recorded. Eventually, it is also possible to recommend from the result that onion bulb yield was more responsive to the main effect of nitrogen and its interaction with P2O5 but not much respond to the main effect P2O5 application alone. We can conclude that rather than application of 92 kgha-1N*138kgha-1 P2O5 and 46kgha-1N*92kg ha-1 P2O5, application of 100 kgha-1 N alone gave remarkable bulb yield. This directly indicated that bulb yield of onion production is more responsive to nitrogen application than P2O5 fertilizer rates. As this experiment was conducted during the main rainy season disease infestation (purple blotch) was the main problem encountered especially in the second year followed the humid environment. So, application of chemical (Orious) 2 litha-1 2-3 times with in fourteen days interval is very crucial to check/control this diseases. Keywords: Bulb Yield, Nitrogen, Onion, Phosphorus
      DOI : 10.7176/JNSR/13-8-01 Publication date: April 30th 2022
      Issue No: Vol. 13
  • Review of the Role of Landscape Approach in Biodiversity Conservation:
           Corridors, Patches and Matrix

    • Authors: Adugna Babu
      Abstract: Achieving global conservation goals requires that realizations, agreements, and directives be customized   to reach all levels. In the context of the Convention on Biological Diversity, this means that approaches to conserving biological diversity must be developed at the local landscape level to support national implementation of the Convention. The main objective of this paper was to review the basic role of landscape in conserving biodiversity. To achieve the goal, different articles and books were referred. As it was reviewed, the three elements of landscape namely corridors, patches and matrix contribute pivotal roles in conservation of biodiversity as they facilitate mobility, particularly, for wild animals.  In recent years, protected area management has evolved from a species-based conservation approach to a livelihoods-based landscape approach. A landscape approach to conservation offers significant benefit. It is impractical to plan and implement conservation for all species and their habitat requirements at different landscape scales. Many places around the world are considering how to simultaneously improve local livelihoods, meet national-level development needs, and achieve conservation goals on urgency as current decisions are paving the future pathway for people and biodiversity in landscapes. This is because, landscape approaches seek to provide tools and concepts for allocating and managing land to achieve social, economic, and environmental objectives in areas where agriculture, mining, and other productive land uses compete with environmental and biodiversity goals. Therefore, landscape approaches should gain prominence in the search for solutions to reconcile conservation and development tradeoffs. Keywords: Landscape, Landscape Structure, Biodiversity Conservation
      DOI : 10.7176/JNSR/13-8-03 Publication date: April 30th 2022
      Issue No: Vol. 13
  • Ginger Bacterial Wilt (Ralstonia solanacearum) Management Approach in
           Ethiopia: A Review

    • Authors: Afework Legesse
      Abstract: Ginger is produced for its spice and medicinal properties in tropical and subtropical climates around the world. In diverse parts of the world, ginger, like most cultivated crops, is affected by biotic and abiotic variables. One of the most frequent diseases in many crops, including ginger, is bacterial wilt (Ralstonia solanacearum). This review aims to highlight key scientific findings on this economically significant ginger wilt disease in Ethiopia, as well as disease management choices, problems and future considerations. Cultural, chemical use, Biological, and Resistant Cultivars are some of the primary management approaches that can aid in the reduction of ginger bacterial wilt disease effects. However, due to the disease's novel strain creation, no one effective management plan exists. As a result, using an integrated disease management approach is the most effective, ecologically friendly, and cost-efficient option for consumers. Because there is currently no single effective control measure against the target pathogen, a well-coordinated effort is needed to design an integrated disease management program that will help to reduce disease related damage and yield loss. Keywords: Bacteria wilt, Ginger, Integrated management, Race
      DOI : 10.7176/JNSR/13-8-04 Publication date: April 30th 2022
      Issue No: Vol. 13
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Heriot-Watt University
Edinburgh, EH14 4AS, UK
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