1,720,991 research outputs found
New multi-model approach gives good estimations of wheat yield under semi-arid climate in Morocco
No full textWheat production in Morocco is crucial for economy
and food security. However, wheat production is difficult
because the semi-arid climate causes very variable wheat
yields. To solve this issue, we need better prediction of the
impact of drought on wheat yields to adapt cropping management
to the semi-arid climate. Here, we adapted the models
WOFOST and CropSyst to agro-climatic conditions in Morocco.
Six soft and durum wheat varieties were grown during
the 2011–2012 and 2012–2013 growing seasons in the experimental
sites of Sidi El Aydi, Khemis Zemamra and
Marchouch. Drip irrigation and rainfed treatments were arranged
in a randomised-block design with three replicates. We
determined the phenological stages of emergence, tillering,
stem elongation, flowering and maturity. We measured aboveground
biomass six times along the season. These data were
used to adapt WOFOST and CropSyst to local conditions. Our
results show that both models achieved good estimations, with
R2 always higher than 0.91, and positive values for Nash and
Sutcliffe modelling efficiencies. Results of spatially distributed
simulations were then analysed for the whole country in
terms of different response to drought
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
Barley genetic resources under climate changes: a possible way in field study
No full textPresentation presented at the International workshop: “Applied Mathematics and Omics
Technologies for Discovering Biodiversity and Genetic Resources for Climate Change Mitigation and Adaptation to Sustain Agriculture in Drylands
Final Technical Progress Report - Precision field- based Phenotyping Platform for Drought/Heat Tolerance- Morocco (PWPP) 2020-2021
No full textPrecision field-based wheat phenotyping platforms have been developed with the
support of the CGIAR WHEAT Program and with co-investment from national
agricultural research institutes (NARS). The objectives are to generate phenotypic
data on prioritized traits when grown under defined good practices, and to foster
germplasm exchange. Within this network, a phenotyping platform has been
established for the evaluation of drought and heat stress tolerance in wheat, under
controlled field conditions and using lysimeter/HTP facilitie
Barley Genetic Resources for Climate-Change Adaptation
No full textBarley (Hordeum vulgare L.) has been cultivated over millennia, making it one
of the oldest domesticated crops (Salamini et al. 2002). Ranking fourth in global
cereal-crop production, it is used for animal feed, brewing malts, and human consumption
(von Bothmer et al. 2003). Given barley’s long history as a crop involving
migration and selection leading to adaptation to different environments and
agroecology gradients, leading to a plethora of uses, it has the potential of being
an excellent model for further elucidation of agricultural responses to changing
and evolving climates (Dawson et al. 2015). Barley landraces are genetically heterogeneous
populations comprising inbreeding lines and hybrid segregates generated
by a low level of random outcrossing in each generation (Nevo 1992)
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
Evaluation of the severity and tolerance of a collection of durum wheat to root rot assessment
No full textNational production of durum wheat falls short of its potential, and
By controlling its major diseases, including root rot. These
latest induced by Fusarium culmorum and Cochliobolus sativus, see their
Severity worsen with climate change. Genetic improvement work
Diseases are more or less discontinuous, and it is from this perspective that this
The aim of this work is to evaluate the levels of resistance to root rot
National collection of 100 strains of durum wheat. The lines were planted in natural soil
Previously inoculated with a conidial suspension of the two fungi. The experience
Was repeated twice during two years under glass. The selected variables were
The severity index (SI), the percentage of germination (Germ), and the dry weight (PS). The
Selection of resistant lines was based on the analysis of variance, and the identification of
Tolerant lines was accomplished by integrating main component analysis,
And hierarchical classification, all based on (IS, PS, and Germ and yield
biological). Seven lines were identified as resistant on both
Years: 3012, 9373, 3010, 3191, 9416, 40041 and 3052 with severities ranging from 42 to 52%,
On the other hand, lines 3206, 9406, 3017 and 3110 were identified as tolerant with
Severity ranging from 41 to 50% but with a biological yield ranging from 3.4 to 5.7 g. The Implications of our findings are discussed at the level of this paper
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
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