1,720,978 research outputs found
ORGANIC SOIL AMENDMENTS AND INTERCROPPING AS STRATEGIES TO REDUCE GROUNDWATER NITRATE CONTAMINATION IN POTATO (Solanum tuberosum L.) PRODUCTION SYSTEMS
No full textAgricultural pollutants are commonly detected in Wisconsin groundwater samples, particularly in areas with coarse-textured soils and high input agriculture. Realistic and effective techniques for reducing groundwater contamination is necessary given the human health implications of polluted groundwater resources. Soil column studies were conducted in 2022 at the University of Wisconsin Arlington Research Station to evaluate the ability of organic soil amendments to reduce the nitrogen content of leachate in coarse-textured soils. Soil additives included two biochar types, two papermill residual sludges, and one humic acid treatment compared to non-treated soil. Nitrogen fertilizer was added in two applications (initial and midseason), and columns were watered every two weeks for 14 weeks. Leachate volume differed among the sample timings, but no significant trend was noted between soil treatment and leachate volume. Biochar and papermill waste reduced nitrate-nitrogen content in leachate compared to non-treated soil. Humic acid was ineffective.
Intercropping systems may also be able to reduce agricultural pollutants in groundwater. Field studies were conducted in 2022 and 2023 at the University of Wisconsin Hancock Research Station to investigate the ability of potato (Solanum tuberosum L.) to be grown in an intercropping system without decreasing potato yield. Potatoes were intercropped with a fall-planted winter rye (Secale cereal), and spring-planted winter rye, and a spring-planted yellow mustard (Guillenia flavescens) in a randomized complete block design with four replications. The study was repeated. Companion crop biomass was quantified throughout the season, and b-size, cull, and total marketable tuber yield were determined. No differences in b-size, cull, or total marketable yield were noted among any of the treatments when compared to the control. Intercropping showed potential to be implemented in potato systems without reducing yield, but nitrogen fate should still be investigated to determine whether the systems could potentially address water quality concerns
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
A producer-led framework to assess water sustainability in agriculture: The NISA example
Get PDFGreat strides could be made in sustainable natural-resource use from agricultural and societal standpoints with a few relatively simple choices. From an agricultural standpoint, if the goal is to reduce water use and crop yield is improved through biotechnology and innovative practices, then land should be taken out of production. Using the same amount of a resource such as water to produce more will address some of the needs of a growing population, but will not address the limitations of that resourc
Recommended from our members
Big Data: Big Possibilities for the Cranberry Industry?
No full textAbstract: Cranberry yield and quality vary significantly within a season among production beds, marshes and geographic locations. Additionally, production is inconsistent among years. In anecdotal observation, the variability in cranberry yield is much greater than in many other crops. Why do some beds produce 200 barrels/a while nearby beds or marshes produce over 700 barrels/a in the same growing season and with the same variety? Consistent, high-quality berry production would aid individual growers in terms of long-term planning and the industry relative to crop forecasting and utilization. Previous research efforts have focused on individual parameters, such as fertilizer quantity or herbicide choice, yet it is commonly accepted that production levels are a result of a multitude of factors. Consistent cranberry production is challenged by several multi-variable issues that are often lumped in the general category of a “stressed” crop. Multi-variable issues require a systems approach with robust data to lead to confidence in the solutions. Additionally, an economic component can be included to help determine which parts of consistent yield are financially reasonable to address and which can’t be solved (such as soil type), thus eliminating spending on inputs that don’t add yield or quality. Using a “big data” approach, we can determine the relationship among crop production parameters and berry yield and quality. The more data that is included, the more certain we can become about those relationships. We conducted a pilot project with Wisconsin cranberry growers using 2016 production year data (November 1, 2015 through October 31, 2016). Growers were engaged in developing the list of inputs where data collection was anticipated to affect berry yield and quality and in providing pilot data for initial analysis. Sixteen pilot growers entered intensive data from over 500 cranberry beds. Forty-one variables were included that fall broadly in 6 categories: broad production characteristics (such as soil pH), water management, pest management, fertility management and tissue tests, pollinator management, and cultural practices. The relationship among these characteristics and cranberry yield and quality (brix, color, firmness, fruit size, useable fruit and rot) are currently being explored. In preliminary analysis, drivers of berry yield and quality were identified that were not anticipated but very feasible to modify with reduced grower costs, such as through reducing pre- and post-season irrigation and flood events that result in saturated soil that reduces vine productivity. Other relationships were expected, such as a positive correlation between %N and fruit yield. Our next goals are to expand the initial pilot work, automate an analytical methodology that will be self-sustaining and refine cranberry production such that input levels are optimized for berry yield and quality. This presentation is not available for downloading
Small broomrape: biology and management in the Pacific Northwest
No full textThis archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Title from PDF caption (viewed on Oct. 29, 2010)"Published January 2005, reprinted August 2008"--P. [4]Mode of access: Internet from the Oregon Government Publications Collection
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
- …
