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| Registros recuperados: 176 | |
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| Chalak, Morteza; Pannell, David J.. |
| Weeds can cause significant problems to natural ecosystems. Although there have been numerous studies on the economics of weed control, relatively few of these studies have focused on natural ecosystems. This paper addresses this gap in the literature by assessing the cost-effectiveness of a comprehensive range of control strategies for blackberry (Rubus anglocandicans) in natural environments in Australia. We developed a stochastic dynamic simulation model and a deterministic dynamic optimisation model. The stochastic model calculates the expected net present value (NPV) of a range of control strategies, including any combination of treatment options. The optimisation model identifies the treatment combination that maximises NPV. Both models represent the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environment; Economics; Weed; Stochastic; Optimisation; Management; Environmental Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/108416 |
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| Armstrong, Dan P.; Ho, Christie K.M.. |
| Interest in automatic flood irrigation is strong, given the labour and lifestyle benefits it can provide. An economic analysis of three automated flood irrigation systems for a dairy farm in northern Victorian indicated that automatic irrigation can be a profitable labour saving investment in many cases. However, profitability was sensitive to the amount and value of the labour saved. Pneumatic and timer systems were good investments regardless of the area they were installed to service. The supervisory control and data acquisition (SCADA) system was a good investment when more than 50 ha were serviced by the system. Irrigation water savings are unlikely to have a significant effect on the profitability of automatic irrigation, particularly if the price of... |
| Tipo: Article |
Palavras-chave: Dairy farming systems; Automatic irrigation; Economics; Farm Management. |
| Ano: 2010 |
URL: http://purl.umn.edu/120865 |
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| Xie, Xinyi; Tu, Baojun; Ma, Jing. |
| Taking three counties in northern Jiangsu (Suining, Ganyu and Sihong) as the respondents, the economic principles of food safety issues of rural areas in northern Jiangsu are described from three aspects which are information asymmetry, food supply and food safety issue and food consumption and food safety issue. From the two aspects-adverse selection of consumers and opportunistic behaviors of producers, the paper introduces the influence of food safety issues of rural areas in northern Jiangsu are put forward; First, improve consumers’ knowledge of food safety; second. Normalize the behavior of main bodies of production and management; Third, improve the current situation of information asymmetry of food safety ; fourth, accelerate economic construction... |
| Tipo: Journal Article |
Palavras-chave: Northern Jiangsu; Rural areas; Food safety; Economics; China; Agribusiness. |
| Ano: 2010 |
URL: http://purl.umn.edu/101901 |
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| Tisdell, Clement A.; Wilson, Clevo. |
| Discusses generally why humans should bother to conserve sea turtles. In doing so, it considers both economic and non-economic reasons and outlines threats to the existence of sea turtles and ways in which tourism may either contribute to the conservation or decline of their populations. Turtle-based ecotourism at Mon Repos in southern Queensland is described. As a result of a survey conducted by the authors, it is shown that turtle-based ecotourism at Mon Repos has positive social (indirect) consequences for the conservation of sea turtles. Furthermore, it is argued that ecotourism operations at Mon Repos have positive direct impacts on the sustainability of populations of sea turtles. However, using a simple model, it is demonstrated that this impact is... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Biodiversity; Economics; Ecotourism; Sea Turtles; Sustainable Tourism; Wildlife Conservation.; Environmental Economics and Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/48008 |
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| Diebel, Penelope L.. |
| Ethics and agriculture is a complex debate, but one in which agricultural economics students must be prepared to participate. There are many links between economics and ethic or moral philosophy. Classroom teaching tends to focus on discussion of issues involving behavioral ethics and disregards the teaching of philosophical ethics and its application in agricultural economics. A discussion is presented regarding the ethical context we have inherited in agricultural economics. I offer some broad moral philosophy concepts and an argument for providing students with tools to develop a philosophical ethics perspective of agricultural economics. |
| Tipo: Journal Article |
Palavras-chave: Agriculture; Economics; Ethics; Philosophy; Teaching; Teaching/Communication/Extension/Profession. |
| Ano: 2008 |
URL: http://purl.umn.edu/46565 |
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| Lambregts, Johannes Adrianus; Griffin, Wade L.; Lacewell, Ronald D.; Davis, James T.; Clary, Gregory M.. |
| Cost, returns, and economies of scale for small, medium and large catfish farms with recirculating ponds are presented for the upper Texas coast. Internal rates of return are 0.150, 0.183 and 0.219, respectively. Total investment is higher than farms with static ponds but investment per unit production capacity is 7 percent to 16 percent lower. Average total cost per pound is between $0.565 and $0.541, (11 percent 20 percent lower than farms using current technology). These results have implications for regional comparative advantage of catfish production as well as incentive for adoption of new technology in conventional ponds. |
| Tipo: Journal Article |
Palavras-chave: Aquaculture; Catfish; Economics; Off-flavor; Livestock Production/Industries. |
| Ano: 1993 |
URL: http://purl.umn.edu/15045 |
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| Economic Assessment of Selected Resource Management Techniques in Marginal Upland Agriculture, by Min-Jae Kim; Message of the Executive Secretary, United Nation Economic and Social Commission for Asia and the Pacific, by Adrianus Moo; Opening Statement, by Sangwoo Park Opening Statement, by Haruo Inagaki; Opening Statement, by Kyuyong Suh; Current Status and Future Tasks in Marginal Upland Agriculture, by Sangwoo Park; Economic Assessment of Selected Management Practices for Efficient Use of Saline-Sodic Water in Arid and Semiarid Subtropical India, by Mahander Singh; Irrigated Ecosystem in India - Sustainability Issues, by R. L. Yadav; Economic Assessment of Selected Resource Management Techniques in Marginal Upland Agriculture of Mawlasnai, Meghalaya;... |
| Tipo: Report |
Palavras-chave: Marginal farms; Upland areas; Resource management; Economics; Environmental Economics and Policy; International Development; Resource /Energy Economics and Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/32736 |
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| Sedjo, Roger A.. |
| Marion Clawson passed away in April 1998 at the age of 92. He was a giant in the field of resource and environmental economics who devoted the last decade and one-half of his professional career to forest and forest related issues. He produced over 30 professional books and hundreds of papers. This paper presents a broad overview of his career as an economist, with a focus on his work in and influence on forestry and forest policy. From the early 1970s through to his last professional book in 1983, and his final professional contributions in the mid 1990s, Clawson devoted most of his professional efforts to forest issues. His influence on forests and forest policy was substantial, especially in the context of public policy toward America's publicly owned... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Marion Clawson; Forest; Economics; Resources; Policy; Timber; Recreation; History; Resource /Energy Economics and Policy; B31; Q10; Q20; Q23; Q24; Q26; Q28. |
| Ano: 1999 |
URL: http://purl.umn.edu/10755 |
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| Cacho, Oscar J.; Wise, Russell M.; Hester, Susan M.; Sinden, Jack A.. |
| When a weed invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. Ideally, these decisions should be based on a complete benefit-cost analysis, but this is often not possible. A partial analysis, combining knowledge of the rate of spread, seedbank longevity and economic-analysis techniques, can assist in making the best decision. This paper presents a model to decide when immediate eradication of a weed should be attempted, or whether weed control should be attempted at all. The technique is based on identifying two 'switching points': the invasion size at which it is no longer optimal to attempt eradication, and the invasion size at which it becomes optimal not to apply any form of control. It... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Invasive species; Eradication; Containment; Economics; Weed control; Switching point; Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/12908 |
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| Chalak, Morteza; Pannell, David J.; Polyakov, Maksym. |
| Invasive species are significant threats to biodiversity, natural ecosystems and agriculture leading to large worldwide economic and environmental damage. Spread and control of invasive species are stochastic processes with important spatial dimensions. Most economic studies of invasive species control ignore spatial and stochastic aspects. This paper covers this gap in the previous studies by analysing a spatially explicit dynamic process of controlling invasive species in a stochastic setting. We show how stochasticity, spatial location of infestation and control can influence the spread, control efficiency and optimal control strategies. The main aim of this paper is to analyse the relationship between economic parameters and stochastic spatial... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Spatial; Dynamics; Invasive; Economics; Stochastic; Optimisation; Environmental Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/103325 |
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| Chalak, Morteza; Pannell, David J.. |
| Although there have been numerous studies on the economics of weed control, relatively few of these studies have focused on natural ecosystems. The aims of this papers are: A) to identify the combination of control options that is optimal for blackberry (Rubus anglocandicans) in Australian natural ecosystems, B) to assess whether an integrated control strategy is superior to chemical-only strategies, C) to evaluate the economic net benefits of specific biologically oriented control methods (a rust and grazing by goats), D) to determine how changes in model parameters affect the optimal control strategy. To address these aims, a stochastic dynamic simulation model and a stochastic dynamic programming model are developed. The results indicate that, while an... |
| Tipo: Presentation |
Palavras-chave: Environment; Economics; Weed; Stochastic; Optimisation; Management; Environmental Economics and Policy. |
| Ano: 2012 |
URL: http://purl.umn.edu/124373 |
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| Sell, Randall S.; Nudell, Daniel J.; Bangsund, Dean A.; Leistritz, F. Larry; Faller, Timothy. |
| This report presents an economic feasibility study of a 5,000 head, cooperatively owned, sheep operation for leafy spurge control. The objectives were 1) determine the return on investment of the cooperative, 2) determine the proposed structure of the cooperative, and 3) ascertain the amount of capital investment required by members in the cooperative. Three sheep flock management alternatives were initially considered for the cooperative. These were 1) winter lambing, 2) spring lambing, and 3) fall lambing. The fall lambing scenario was determined to be infeasible because of logistics associated with gathering and transportation of pregnant ewes and lack of grazing pressure on leafy spurge throughout the grazing season. The total capital investment... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Leafy Spurge; Cooperative; Weed Control; Sheep Grazing; Economics; Farm Management; Resource /Energy Economics and Policy; Agribusiness. |
| Ano: 2000 |
URL: http://purl.umn.edu/23201 |
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| Registros recuperados: 176 | |
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