1,720,955 research outputs found
Evaluation of Fungicides with the Combinations of Potato (Solanum tuberosum L.) Varieties to Manage Late Blight (Phytophthora infestans (Mont) de Bary) in Highlands of Guji Zone, Southern Ethiopia
Get PDFPotato late blight (Phytophthora infestans (Mont.) de Bary) is one of the most devastating plant diseases world-wide and is feared globally by farmers and industry. There is little information on the type of fungicide to be sprayed to control late blight for optimum production of the crop in the study area. Therefore, an experiment was conducted at Bore Agricultural Research Center, Southern Ethiopia during the 2015 and 2017 cropping season to evaluate fungicides with the combination of Potato varieties to manage late blight and to assess the cost and benefits of different fungicides on Gudanie and Jalenie potato varieties. The treatments consisted of two (2) Potato varieties Gudanie and Jalenie currently under production but differ in their late blight reaction and three (3) fungicides Ridomil Gold MZ 63.5%WP, Mancozeb 80% WP2 and Matico and one (1) unsprayed treatments were used as experimental materials. The experiment was laid out as a Randomized Complete Block Design (RCBD) in a 4 x 2 factorial arrangement and replicated three times per treatment. The improved potato varieties called Gudanie and Jalenie were planted as the test crop in a plot size of 3 m * 2.1 m with intra and inter-row spacing of 0.30 and 0.75 m respectively. Data were collected on growth, yield, yield components and disease incidence and severity. The two years combined data analysis results revealed that the interaction effect of fungicides and potato varieties had influenced significantly (P<0.05) response on days to 50% flowering, 50% maturity, plant height, number of tubers per hill, stem number per plant, marketable tuber yield and unmarketable tuber yield and total tuber yield. However, interaction effect of fungicides and potato varieties had non-significant (P>0.05) effect on days to50% emergency and average tuber weight. The two year data analysis the highest (47.34 t ha-1and 46.31 tha-1) marketable tuber yield was obtained from Gudanie variety with Ridomil Gold fungicide spraying at Bore on-station and Ana sora on-farm both locations respectively. The result of 2015 year disease data indicates that maximum (59.52% and 3.67) disease incidence and severity, respectively was recorded by unsprayed treatment of Jalenie variety and also the second year maximum (45.24 % and 2.83) disease incidence and severity by treatment Gudanie variety unsprayed fungicides, respectively. However, the minimum (5.48% and 1.16) disease incidence and severity of late blight was recorded by spraying Ridomil Gold on both Gudanie and Jalenie varieties in 2015 cropping season, respectively. In general, spraying of Ridomil Gold fungicide was more effective by reducing the disease severity and increasing tuber yield. The partial budget analysis revealed that application of Ridomil Gold on Gudanie variety resulted the highest net benefits of Birr 244,462.50 and 235,352 ha-1 with an acceptable marginal rate of returns (MRR) of 2549.00 and 2698% . Thus, application of Ridomil Gold on Gudanie variety led to optimum marketable tuber production and economic returns. Therefore, the farmers’ in highlands of Guji zone and similar agro-ecology can produce healthy and maximum potato crop of Gudanie by spraying Ridomil Gold fungicide with the recommended rates and frequency. Keywords: Disease severity and incidence, Sprayed and Unsprayed plot, Marketable tuber yield and Partial budget analysi
Participatory Selection of Potato (Solanum tuberosum L.) Varieties in the Midland Areas of Guji zone, Southern Ethiopia
Get PDFIrish Potato (Solanum tuberosum L.) is one of the most important food security and cash crop produced at different agro-ecologies of Guji Zone, Southern Ethiopia. However, in the midland areas of Guji zone an access of improved potato variety is highly limited. Due to this reason and other bottle neck factors, the potential of the area to potato crop is not exploited. So, there is an urgent need to develop and promote technologies that suit for the area. As a result, an experiment was conducted in the midland areas of Guji Zone (Dibayu, Kiltu sorsa, Gobicha and Dole) at four farmers’ fields during 2019/20 cropping season to evaluate potato varieties with active participation of farmers and to identify and select adaptable, high yielding, and late blight tolerant potato variety (ies) for midland areas of Guji zone. Seven (7) improved potato varieties Gudanie, Chiro, Zemen, Bubu, Chala, Bedasa, and Gebisa were used as testing crop. The treatments were arranged in randomized completed block design (RCBD) with three replications for mother trial and farmers were used as replication for baby trials. Both agronomic and farmers data were collected based on the recommended standards. Data collected from mother trail were subjected to analysis of variance where as matrix ranking was used for data collected from baby trial. The analysis of variance indicated that significant differences observed at (P≤ 0.05) among the tested Irish potato varieties for stem number per hill, tuber number per hill, marketable and total tuber yield. However, non-significant difference was observed at (P> 0.05) among the varieties for days to 50% emergence and flowering, days to 90% maturity, plant height, tuber weight and unmarketable tuber yield. The highest marketable tuber yield was (41.32t/ha) was recorded for Zemen followed by Gudanie and Bubu (36.81 and 36.78 t/ha) respectively. But, the lowest marketable tuber yield 21.85t/ha was obtained from improved Gebisa variety. In other cases, farmers were allowed to evaluate the varieties using their own criteria. Accordingly, variety Zemen, Bubu and Gudanie were selected by farmers due to their best performance, high yielder, resistance to disease, number of tubers and marketability. Therefore, these three improved Irish potato varieties are selected based on agronomic data result and farmers preference and recommended for production to the midland areas of Guji zone. Keywords: Improved variety, Irish Potato, participatory variety selection DOI: 10.7176/JNSR/12-16-01 Publication date:August 31st 202
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
PARTICIPATORY SELECTION OF POTATO (Solanum tuberosum L.) VARIETIES IN THE HIGHLAND AREAS OF GUJI ZONE, SOUTHERN ETHIOPIA
Get PDFPotato (Solanum tuberosum L.) is one of the most important food security and cash crop for farmers in highland parts of Ethiopia, particularly in Guji zone where it s grown by farmers and seed producers abundantly. However, in the highland areas of Guji zone an access, well adapted, résistance to late blight and high yielder potato variety is highly limited. Due to this reason, there is an urgent need to develop and replace the previous underproduction varieties that suit for the area. As a result, an experiment was conducted in the highland areas of Guji Zone at Bore on-station and three farmers’ fields (Abayi kuture, Raya boda, and Bube korsa) during 2019/20 cropping seasonto select and recommend high yielding, and diseases résistance improved potato varieties through participatory variety selection. Six (6) improved potato varieties (Gudanie, Belete, Jalenie, Dagim, Horro, and Bubu) were used as testing crop. The treatments were arranged in randomized completed block design (RCBD) with three replications for mother trial and farmers were used as replication for baby trials. Both agronomic and farmers data were collected based on the recommended standards. Data collected from mother trail were subjected to analysis of variance where as matrix ranking was used for data collected from baby trials. The analysis of variance indicated that significant differences observed at (P≤ 0.05)among the tested Irish potato varieties for day to 50% emergence and flowering, stem number per hill, tuber number per hill, marketable and total tuber yield. However, non-significant difference was observed at (P> 0.05) among the varieties for days to days to 90% maturity, plant height, tuber weight and unmarketable tuber yield. The highest marketable tuber yield was (48.17t/ha) was recorded for Belete followed by Bubu and Gudanie (35.35 and 34.3t/ha) respectively. But, the lowest marketable tuber yield (18.07t/ha) was obtained from improved Dagim variety. In other cases, farmers were allowed to evaluate the varieties using their own criteria. Accordingly, variety Bubu and Gudanie were selected by farmers due to their resistant to disease, stem number, tuber size, tuber color, tuber eye depth, number of tubers and marketability. Therefore, these two improved Irish potato varieties are selected based on agronomic data result and farmers preference and recommended for production to the highland areas of Guji zone
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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