1,720,958 research outputs found
Response of tef row planting to sowing dates on the highland heavy clay soils: Reducing Land Degradation and Farmers’ Vulnerability to Climate Change in the Highland Dry Areas of North-Western Ethiopia
No full textTeff, Eragrostis tef /zucc./ Trotter is one of the most important cereal crops in Ethiopia that occupies (32%), the largest cultivated area under cereals and 26% of the whole area cultivated to annual field crops by covering about two million hectares of land annually. Tef is adapted to environments ranging from drought stress to water logged soil conditions. It can be grown at altitude ranging from sea level to 3000m above sea level, with the maximum production occurs between 1700 and 2400m. Tef has its own unique qualities and advantages such as its tolerance to reasonable levels of both drought and water logging.
Tef is the principal crop of Ethiopia and stands first both in area coverage and production among cereals. However, the productivity of the current cultivars in the region is below the national average yield of tef under traditional practices (9.1 q/ha) and improved technologies (17-22 q/ha) on farmer fields. Even though research efforts in the last few decades developed important technologies to overcome production constraints and increase productivity, the productivity has not yet been raised to satisfactory level as compared to the potential. Factors contributing to low yields are practicing of inproper agronomic practices, drought, low soil fertility, soil erosion, poor crop management practices, insect pests and weeds. Among insect pests grasshopper, wollo bush cricket; tef shoot fly, locust and armyworm are some of the major once. Tef shoot fly attacks tef throughout the crop’s active growing period. However the seedling stage is the most critical. Tef production constraints such as lodging, drought, water logging, insect pest heat and frost might be overcome through a comprehensive agronomic practice program.
Development of improved and appropriate agronomic practices (seed rate, sowing dates, seedbed preparation, fertilizer type, rate and time of application), and cropping systems (crop sequence, relay cropping, intercropping, etc.) would greatly contribute to overcoming production constraints and improving productivity of tef
Effect of deficit irrigation on growth and yield of onion
No full textFinal dataset from agronomic experiment in Gumara Maksegnit (2016), as elaborated by GARC researcher in charge for this trial (Muuz Gebretsadik). Please contact author and contact person at ICARDA to obtain more detailed metadata or to propose collaboration
Soil moisture prediction in an agricultural field of Gumara-Maksegnit watershed, North Gonder, Ethiopia
No full textMaster Thesis: The research question of this study is then ‘how much soil moisture is left in the soil during drying process or recession of the summer (wet) season whose rainfall distribution is uni-modal as well as uncertain in its occurrence’ and ‘How readily available topographic data can be used to predict soil moisture patterns and their spatial distribution’
Predicting Spatial and Temporal Soil Moisture Distribution in an Agricultural Field of Gumara-Maksegnit Watershed, North Gondar, Ethiopia
No full textTropiLakes 2015 Book of Abstracts
Collection and analysis of watershed hydrological data (Preciptiation, Runoff, sediment and nutrient yields)
No full textSpecific objective of this activity was to monitor the meteorological variable, surface hydrology and sediment and nutrients (available P, Total N and Organic carbon) yields at the Gumara-Maksegnit watershed and to use these data for the calibration and validation of hydrological and bio-economic models and as reference information for similar watersheds. The selected watershed Gumara Maksegnit watershed has an area of 5,600ha and includes several sub-watersheds among which Abakaloye and Ayaye with respective surface area of about 32ha and 24ha, which were selected for sub-watershed scale monitoring. Monitoring and assessment have been conducted since 2011, generating a 6 years long data series that is being used for calibration and validation of hydrological models. This report summarizes the data collected during the project duration (2013 to 2015) at both watershed and sub-watershed scale. Long term partners of this specific activity are ICARDA, ARARI, and Boku. It has to be noted that the data presented here are currently being elaborated for publication and fr reasons of space are incomplete. This report is only aimed at illustrating the nature and quality of the dataset, and to broadly visualize the information collected
Reducing land degradation and farmers’ vulnerability to climate change in the highland dry areas of north-western Ethiopia
No full textThe document presents research activities on Mitigating Soil Erosion and Water Scarcity, Increasing Farmers’ Adaptation Capacity to Climate Change in the Highland dry areas of Ethiopi
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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