1,720,952 research outputs found
Agronomic and nutritional considerations for increased soybean productivity
Get PDFIncreasing soybean [Glycine max (L.) Merr.] productivity will require a comprehensive understanding of the agronomic, nutritional, and genetic factors that influence soybean yield. Despite recent agricultural innovations, there is a common perception that soybean yields have reached a plateau. While most producers overlook the fertility needs of soybean, others believe that improved nutritional management may hold promise for improving soybean productivity. The synergy between adequate nutrient availability in combination with complementary agronomic practices, may be necessary to realize the genetic yield potential of soybean. For these reasons, the objective of this research was to quantify how agronomic and nutritional management practices can be employed to improve soybean productivity which encompasses four research areas:
What are the nutritional needs of current soybean cultivars which frequently realize higher yields now than ever before?
Research was conducted to quantify the macro- and micronutrient needs of modern soybean cultivars. Nutrients exhibited variation in their uptake, partitioning, and remobilization and presented data should be considered relevant for producers who target or achieve a yield level of 3500 kg ha-1 or higher. Current soybean varieties also exhibited greater dry weight harvest index values relative to previous research which has concomitantly influenced the rate, duration, and partitioning of nutrient accumulation in soybean. Collectively, these findings emphasize the importance of season-long nutrient availability to most effectively meet soybean fertility needs.
Can management practices be designed to supply these nutritional needs and achieve improved soybean productivity?
Quantification of soybean fertility needs highlighted the importance of phosphate availability, and when supplied as one of five categorical management factors, significant yield increases were realized. Other factors including variety selection, seed treatment, foliar fungicide and insecticide use, and row spacing configuration contributed to improved soybean productivity across a range of environments. An additional study provided in-season applications of N, K, and S using a subsurface drip irrigation (SDI) system and improved seed yield by as much as 357 kg ha-1.
Do other agronomic decisions such as variety selection influence the responsiveness to nutrient supply?
Results indicated that variety selection significantly influences the outcome of nutritional and agronomic treatments. The value of fertilization, foliar fungicide and insecticide, and seed treatment practices were as much as two-fold greater when applied to fuller season varieties. Additional findings determined that varietal selection cannot be based on RM alone and that classifying varieties based on their responsiveness to nutrient supply was predictive of their response to supplemental agronomic management.
What physiological basis exists to support these management-induced productivity improvements?
Soybean’s indeterminate growth habit and compensatory nature between yield components emphasize the complexity of yield determination in soybean. As a result, a more thorough understanding of seed number and seed mass establishment was conducted within the canopy to identify how source and/or sink related factors may limit yield. Fertilization and foliar leaf protection treatments significantly improved yield through different, canopy-dependent, yield component strategies. Responses differed among cultivars which underscore the importance of variety selection and agronomic management as a concerted effort for improved soybean productivity.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01The student, Ross Bender, accepted the attached license on 2015-04-10 at 13:53.The student, Ross Bender, submitted this Dissertation for approval on 2015-04-10 at 14:01.This Dissertation was approved for publication on 2015-04-20 at 11:41.DSpace SAF Submission Ingestion Package generated from Vireo submission #7816 on 2015-07-22 at 14:24:20Made available in DSpace on 2015-07-22T22:45:13Z (GMT). No. of bitstreams: 2
BENDER-DISSERTATION-2015.pdf: 3462445 bytes, checksum: df7d1159b232ff268bf91665c3b72f9c (MD5)
LICENSE.txt: 4208 bytes, checksum: 2703a32201444de730afa9cdcbd26e87 (MD5)
Previous issue date: 2015-04-20Embargo set by: Seth Robbins for item 79968
Lift date: 2017-07-22T22:46:21Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 79968 on 2017-07-23T09:15:24Z
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
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
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
- …
