1,720,953 research outputs found
Tillering propensity and crop water use of different sorghum varieties under varying irrigation regimes
Full text linkThesis (M. Agricultural Management (Plant Production)) -- University of Limpopo, 2025Tillering is one of sorghum’s adaptive traits to water availability, which can ‘make or
break’ crop yields depending on cultivar genetics. The complex interaction between
water availability and genetic expression makes tiller contribution to yield difficult to be
predicted and quantified. Additionally, contributions of sorghum tillers and main stem
to ‘yield per drop’ and water use under different water availability and sorghum
cultivars have not been quantified. Therefore, this study aimed to evaluate tillering
propensity and water use of sorghum cultivars under complex tiller regulating
practices, hence showcasing tiller contribution to sorghum yields and their water
productivity under different sorghum cultivars and varying irrigation regimes. A
literature review on practices and factors that regulate tillering was done to provide
guidelines on the key practices and factors that regulate tillering in sorghum to
enhance the productivity of tillers and yield. Highlighting the effective management
practices that can improve grain yield by prioritising resource allocation hence
minimizing competition among tillers. Moreover, the study emphasized that the
dynamics of tillering must be understood under varying management practises to
maximize the tiller contribution to yield and ‘yield per drop’. As such, the field trial was
conducted to quantify the tiller contributions to yield, water use, and water productivity
at the University of Limpopo experimental farm. The study was carried out as a 3 x 4
factorial, laid out as a split-plot and arranged in a randomized complete block design
(RCBD). The plots comprised of two irrigation regimes assigned as the main (full,
deficit) which were compared to rainfed (unirrigated control), and four sorghum
cultivars as subplots (Mr Buster, PAN606, Macia, and a local landrace) replicated
three times. For addressing the tiller contributions to yield, water use and water
productivity, phenological development, maximum canopy cover, plant height, stem
width, biomass accumulation, number of tillers and fertile tiller percentage, harvest
index, grain yield, soil water content, evapotranspiration, water productivity and the
tiller contributions were collected during the growing season. The interactive effects of
cultivar selection and irrigation regimes significantly influenced shoot dry biomass,
grain yield, water use, and water productivity. Significantly higher shoot dry biomass
(5.70 ton/ha), grain yield (7.10 ton/ha), and water productivity (2.58 kg/m3
) were
recorded from the local landrace when it was cultivated under deficit irrigation. On the
contrary, the lowest sorghum yield (3.04 ton/ha), shoot dry biomass (1.78 ton/ha), and
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water productivity (1.19 kg/m3
) was obtained by Mr Buster with high water use (239.9
mm). However, it had statistically comparable water use and water productivity with
PAN606 (225.5 mm and 1.34 kg/m3
) and Macia (226.2 mm and 1.24 kg/m3
),
respectively. The great performance of landrace was attributed to longer maturity,
number of tillers produced and the adaptability to local environment. The landrace had
high percentage of fertile tillers (81%) compared to Mr Buster (51%). This suggest that
landrace is good at using low water to produce reasonable yield and can be planted
to maximize yield with less water used. Tillers made a substantial contribution to both
overall grain yield and water productivity, accounting for 57% of the total yield
compared 43% contribution of the main stem. Similarly, tillers contributed 53% to water
productivity, while the main stem contributed 47%. Despite this, the main stem
remained the statistically dominant yield contributor across different irrigation regimes
and cultivars. The early-emerging tillers T1 (27 %), T2 (15 %), and T3 (9 %) proved to
be the most productive due to better access to plant available assimilates. In contrast,
the later-emerging tillers T4 (4 %) and T5 (2 %) were less competitive and had a
minimal impact on yield, as they had low access to the resources needed by the plant.
The reported tiller contributions to yield ranges from 5 – 78 %, hence, the conclusion
was drawn that tillers contributing less than 5% to yield are considered non-significant.
Additionally, tiller 1 to tiller 3 consistently contributed within a range of 5 – 78% across
all irrigation regimes and cultivars. Therefore, it is suggested that farmers prioritize
harvesting tillers up to tiller 3, as tillers beyond this point (tiller 4 and tiller 5) do not
contribute significantly to overall yield. It is then recommended that cultivating landrace
under deficit irrigation and focusing on tillers up to tiller 3, could achieve sustainable
yields and maximize the contributions of productive tillers. However, the study was
limited to a single site and season planting. Therefore, it is recommended that future
research include multi-location trials and multiple growing seasons to capture the
spatial and temporal variability of environmental conditions. Furthermore, additional
research should explore specific agronomic practices designed to selectively boost
the productivity of tillers while reducing the presence of unproductive onesFoodBev SET
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
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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