19 research outputs found
Biology and Management of Horseweed (Conyza canadensis) in Citrus Groves
No full textHorseweed has gained importance in recent years due to reports of the development of herbicide resistance to several modes of action, including glyphosate and paraquat. This new 5-page publication of the UF/IFAS Horticultural Sciences Department presents information about the lifecycle, identification, and management of horseweed in citrus groves. This publication is mainly intended for Florida citrus growers but will also be helpful for Extension agents, crop consultants, and others interested in citrus production. Written by Nirmal Timilsina, Sharpton Toussaint, Camille McAvoy and Ramdas Kanissery.
https://edis.ifas.ufl.edu/hs145
Impacts of herbicides on young citrus trees
No full textHerbicide-related injuries in newly planted trees and resets seem to be a growing problem. Every so often, incorrect application of herbicides can lead to injury or even dieback of young trees. Such effects of herbicides in young trees and the extent of damage will depend on the type of herbicide used, exposure rate, etc. This article will discuss the potential impacts of herbicides on young trees and thus helps the growers to adopt tree-safe herbicide programs in immature groves
Diagnosing Herbicide Phytotoxicity in Citrus
No full textChemical weed control is an essential component of the ‘weed control toolbox’ for keeping the weeds checked in citrus groves. Citrus growers primarily rely on herbicides to manage weeds due to their efficacy and cost-effectiveness. However, despite their benefits, herbicides may produce a wide range of unintended effects in citrus. For instance, an herbicide-related injury may occur due to improper spay practices, unfavorable weather conditions, product misapplication, tank contamination, or herbicide carryover from the past application. Moreover, the movement of herbicides as a result of drift, volatilization or runoff, either on-site or from applications on adjoining areas, can also result in tree injury. This article discusses the diagnosis of such injuries from commonly used herbicides in citrus production
Would There Be Surplus Grains for Biofuels? An Assessment of Agro-economic Factors and Biofuel Production Potential at the Global Level
No full textPaper removed for editing by author 10/19/11.biofuel, land resources, productivity increase, food supply, Crop Production/Industries, Resource /Energy Economics and Policy, Q0, Q42, Q18,
'Operation Enduring Nightmare'? : a strategic critique of the military intervention in Afghanistan from October 2001-October 2008
No full textIncludes abstract.Includes bibliographical references.In October 2011, the war in Afghanistan reached its ignominious ten year anniversary. As the conflict rolls on relentlessly, observers from across all disciplines, and indeed the general public themselves, have attempted to identify why the intervention, which began as Operation Enduring Freedom, has instead become an ‘Enduring Nightmare’. This dissertation attempts to provide empirical reasoning to this question by means of a literature review of the established strategic critiques of the intervention between the years of October 2001 and October 2008
Urban Road Transportation Externalities: Costs and Choice of Policy Instruments
No full textUrban transportation externalities are a key development challenge. Based on the existing literature, the authors illustrate the magnitudes of various external costs, review response policies, and measure and discuss their selection, particularly focusing on the context of developing countries. They find that regulatory policy instruments aimed at reducing local air pollution have been introduced in most countries in the world. On the other hand, fiscal policy instruments aimed at reducing congestion or greenhouse gas emissions are limited mainly to industrialized economies. Although traditional fiscal instruments, such as fuel taxes and subsidies, are normally introduced for other purposes, they can also help to reduce externalities. Land-use or urban planning, and infrastructure investment, could also contribute to reducing externalities; but they are expensive and play a small role in already developed megacities. The main factors that influence the choice of policy instruments include economic efficiency, equity, country or city specific priority, and institutional capacity for implementation. Multiple policy options need to be used simultaneously to reduce effectively the different externalities arising from urban road transportation because most policy options are not mutually exclusive. Copyright The Author 2010. Published by Oxford University Press on behalf of the International Bank for Reconstruction and Development / <sc>the world bank</sc>. All rights reserved. For permissions, please e-mail: [email protected], Oxford University Press.
Semi-supervised regression using diffusion on graphs
No full textIndexación ScopusIn real-world machine learning applications, unlabeled training data are readily available, but labeled data are expensive and hard to obtain. Therefore, semi-supervised learning algorithms have gathered much attention. Previous studies in this area mainly focused on a semi-supervised classification problem, whereas semi-supervised regression has received less attention. In this paper, we proposed a novel semi-supervised regression algorithm using heat diffusion with a boundary-condition that guarantees a closed-form solution. Experiments from artificial and real datasets from business, biomedical, physical, and social domain show that the boundary-based heat diffusion method can effectively outperform the top state of the art methods. © 2021 The Author(s)https://www-sciencedirect-com.recursosbiblioteca.unab.cl/science/article/pii/S1568494621001113?via%3Dihu
Effect Of Company Size On Manager's Perception
No full textThe purpose of this study is to explore the effect of a company’s size on its manager’s perception towards changes in market needs and manufacturing flexibility. To serve the purpose,a questionnaire was designed by considering different types of manufacturing flexibility and changes occurring in market needs. The collected data were then analyzed to verify the proposed hypotheses. The results showed that a company’s size significantly influence manager’s perception towards manufacturing flexibility and market requirements. For instance,reliability is given higher priority by managers of micro and small enterprises in comparison with managers of medium and large enterprises. Similarly, routine flexibility is found to be significantly more important to managers of micro and small enterprises, while production facility flexibility is considered more important by managers of medium and large enterprises. Furthermore, the results showed that there is a positive relationship between changes in market requirements and manufacturing flexibility, showing that manufacturing flexibility is governed by changes in market requirements. This research was conducted with managers at various companies in the energy sector; so the results may not be applicable to other industries.© 2014 The author(s). The article is published under the terms of the Creative Commons Attribution-Non-Commercial-NoDerivs license (https://creativecommons.org/licenses/by-nc-nd/3.0/).fi=vertaisarvioitu|en=peerReviewed
Exploring the Possibility of Linking and Incorporating Future Design in Backcasting and Scenario Planning
No full textThere are two approaches to future planning: backcasting and scenario planning. While some studies have attempted to relate and combine these two approaches, a future design (FD) approach has recently been advocated and researched. Given this state of affairs, the paper provides an overview of the FD approach and discusses the potential benefits of linking and incorporating it into backcasting and scenario planning by summarizing the main features of such benefits for future planning for sustainability. A feature of an FD is that it explicitly orients people’s ways of thinking in the current generation to be generative for not only their own future but also generations to come, as well as in designing a plan within a coherent timeframe by demonstrating the characteristics of being prospective and retrospective from the viewpoint of a different generation. Another feature of FD lies in strategy making through some visioning process and in redefining the boundary between what is controllable and what is uncontrollable by considering the perspectives of future generations. We consider this article as a concept paper for the special issue of “Designing Sustainable Future Societies,” building on a literature review and author’s conceptual framework. Thus, our ideas and concepts suggest some potential benefits from incorporating FD into backcasting and scenario planning, further inducing people to be future-oriented and/or sustainable in terms of strategy making. We finally demonstrate some examples of FD practices and illustrative ideas of FD incorporation, remarking on possible avenues for future research
Assessing the Efficacy and Safety of Preemergence Herbicides Applied Alone or in Combination with Superabsorbent Polymer, Soil Binding Agent, and Compost in Tomato (Solanum lycopersicum L.) Plasticulture Production
No full textPreemergence herbicide application under plastic mulch is an effective way to manage weeds in tomato (Solanum lycopersicum L.) production. Nonetheless, applying herbicides beneath plastic mulch in raised beds is associated with the inherent risk of crop phytotoxicity. This highlights the need to explore crop-safe methods for herbicide application in plastic mulch beds. The research aimed to evaluate the effectiveness of preemergence herbicides S-metolachlor and flumioxazin at the labeled rate (X) and reduced rate (0.5X, half of the labeled rate) either alone or in combination with a super absorbent polymer, soil binding agent, or compost to determine their ability to control weeds effectively in plastic mulched beds without causing negative effects on tomato crops. Two different experimental trials, trial 1 (Mar–Jun 2021) and trial 2 (Oct 2021–Jan 2022) were performed in the fields in Immokalee, FL, USA. The experimental design was a randomized complete block with five replications. S-metolachlor (X) plus soil binding agent and S-metolachlor (X) plus compost mix suppressed purple nutsedge density by >85% and approximately 68%, respectively, during trial II. Similarly, S-metolachlor (X), S-metolachlor (0.5X) plus super absorbent polymer, S-metolachlor (X) plus super absorbent polymer, S-metolachlor (X) plus soil binding agent, and S-metolachlor (X) plus compost caused reductions in purple nutsedge biomass by >50% compared with that of the nontreated control during trial II. Treatments did not significantly impact tomato crop vigor and chlorophyll contents during trials I and II. Moreover, treatments did not significantly affect tomato crop biomass and yield during both trials. In summary, using preemergence S-metolachlor (X) combined with soil binding agent or compost could be a viable option for suppressing purple nutsedge in plastic mulched tomato beds
