1,720,964 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Organic Fertilizers Use and Application for Cereal Crop Production in Ethiopia
Full text linkDifferent relevant studies have been held across the county parts or regions to assess the effect different organic fertilizers like compost, farm yard manure, green manure, crop residue and biogas slurry application and use in experiment field and smallholder farming without upsetting their usual living. Results supposed to the benefit of farmers and come up with a policy briefing that policy makers give a better support for its implementation. The experiments conducted in different regions by different researchers like Maichew District of Tigray Region by Hailu Araya, Gozamen Woreda Eastern Gojam Amhara Region by Tadesse Dejene , Haraghe zone Oromia region Easten Ethiopia by Zelalem Bekeko and Sirinka Earstern Amara rgegion by Abebe Getu and Yalemtshay debebe in Sebeta Oromia Region indicated that the application compost Farm yard manure ,green manure and Biogas slurry enhances different crop production and productivity by improving of soil physical and chemical property and also bring additional benefit in terms of minimizing inorganic fertilizers cost. Therefore this visualized or tell us for the future as country level promoting of organic fertilizers in well-organized form is very important to enhance cereal crop productivity and there quality by improving soil and soil fertility issues. Keywords: Organic fertilizers, Cereal crops DOI: 10.7176/JNSR/9-10-03 Publication date:May 31st 201
Mitigation of Climate Change through Conservation Agriculture
Full text linkCurrent and future global environmental change, in combination with population growth and increase in consumption per capital, poses a great threat to global food security. In addition, it is predicted that up to 25% of world food production may be lost during the 21st century due to climate change, water scarcity, invasive pests and land degradation.Smallholders in Ethiopia face widespread problems related to inappropriate cultivation, overgrazing and deforestation, resulting in soil erosion and soil fertility decline, water scarcity, lack of pasture and livestock feed, and fuel wood crisis. This cycles requiring urgent action and different approaches in the dry lands and highland areas adapting to climate change through land and Water management. Increasing weather variability and climate change are contributing to land and natural resource degradation by exposing soils to extreme conditions and straining the capacity of existing land management practices to maintain resource quality. Results include degradation of vegetation cover and loss of biodiversity, soil erosion, depletion of organic matter, reduced rainwater infiltration and water holding capacity of the soil and loss of productivity and effects on wider ecological functions. So that by considering the climate change as national and global condition it is a time to taking action through different alternatives. Among the options conservation agriculture system is one of non-substitutable option among others due to its smartness with climate change by improving soil fertility, water management and food security. DOI: 10.7176/JNSR/12-1-03 Publication date: January 31st 202
Effect of Phosphorus Fertilizer for Maize Production in Gimbo Woreda at Kafa Zone Southern Ethiopia
Full text linkThe current use of commercial fertilizers in Ethiopia is not in harmony with the economics. Although, there have been nitrogen and phosphorus fertilizer rates for the production of maize, sometimes this recommendation does not work outside the experiment sites largely due to the variation of the soil fertility levels on farmer’s field. Therefore, site specific fertilizer recommendation and continual updating and re-evaluation of this recommendation are a vital step for optimizing the maize grain yield. Although field experiment results are more reliable, soil test calibration research could alleviate this problem with much more benefit to farmers and the environment the average national yield. The objective of this study was to assess and evaluate phosphorus fertilizer requirement for Maize. Seven levels of P (0, 10, 20, 30, 40, 50, and 60) combined with sufficient amount of N 46kg and laid down in RCBD with two replication. The experiment was conducted for two consecutive years at Kaffa Zone Gimbo Wereda.TSP was used as a source of P and Urea was used as a source a common combined N. All dose of P was applied at planting while N was applied as splitting half at planting and half after 45 days of planting crop data such as plant highest, stand count at emergency, stand count at harvest,biomass,grainyield,cobelength and 1000seedweight was collected and analyzed using SAS computer software . Composite surface soil samples (0-20 cm) were collected before planting, at harvest from each treatment. The highest maize production of grain yield was obtained from 30kg P ha-1and 50kg P ha-1 on two 2005/6 and 2006/7 consecutive years respectively. So that these levels are better for maize production .but for economic value 30kgPha-l1 should be recommended for better maize production approach. Keywords: P fertilizers, Maize production DOI: 10.7176/FSQM/85-05 Publication date:March 31st 201
Refining Fertilizers Rate Recommendation for Wheat (Triticum aestivum) at Kafa Zone Adiyo Wereda
Full text linkTo refining the effect of different fertilizers NPKS with common Zn and B has significant higher yields in each fertilizer levels on wheat, an experiment were conducted at Adiyo Wereda Kaffa Zone. The experiment was laid out in simple randomized complete block design having three replications. Plot size of 9m2(3 m x 3 m), seed rate of 150 kg ha-1 and row to row distance of 20 cm was used. Various combinations of each fertilizers N (0, 46, 92,138,176 and 222 kg ha-1 with 69p2o5,80k2o,30s,2 Zn and 1B), P (,0,23 ,46,69,92and115 kg ha-1 with 92N,90k2o,30s,2 Zn and 1B), K (0,18,36,54,72and 90 kg ha-1 with 92N,69p2o5,30s,2 Zn and 1B) and S (0,10,20,30,40 and 50 kg ha-1 with 92N,69p2o5,90k2o,2Zn and 1B with additional treatments, control and recommended NP in each fertilizers were used. N=urea; P=TSP; K= KCl; S= CaSO4; Zn=ZnSO4; B = Borax were used as a sources of NPKSZnB. Recommended rates of NP (64:20 kg ha-1) were applied. Nitrogen was applied in two split doses half at sowing and half about 35-45 days after sowing. Variety Digalo was used during the experiment. Plant height, Spike length, Grain yield and biomass were significantly affected by different fertilizers levels. Grain Yield significant at different fertilizer levels 176 N kgha-1 (3400.3kgha-1), 115P kgha-1 (4221.2 kgha-1), 90K kgha-1 (4128.9 Kg ha-1) and 40S kgha-1 (3987.0 kgha-1) were produced respectively in the interaction of ZnB. Based on the results, it is recommended a combined application of NPKS (176 kg N ha-1,115 kg P ha-1, 90 kg K2O ha-1 and 40 kg S ha-1 with 2kg Zn ha-1 and 1kg B ha-1) fertilizers to achieve sustainable bread wheat production on the study area. Keywords: fertilizer rates, wheat DOI: 10.7176/FSQM/120-03 Publication date:October 31st 202
Variations on the Author
Full text link“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
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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