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| Registros recuperados: 38 | |
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| Cacho, Oscar J.; Jones, Randall E.. |
| It is argued in this paper that static approaches to weed management, where the benefits and costs are only considered within a single season, are inappropriate for assessing the economic benefits of weed control technologies. There are carryover effects from weed management as weeds that escape control in one season may reproduce and replenish weed populations in following seasons. Consequently, it is appropriate to view weed control in the context of a resource management problem where the goal is to determine the optimal inter-temporal level of weed control that maximises economic benefits over some pre-determined period of time. A dynamic optimisation model for weed control is presented. Using the tools of comparative static analysis and Pontryagin's... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Weed control; Resource economics; Optimal control; Dynamic programming; Wild oats; Farm Management. |
| Ano: 2000 |
URL: http://purl.umn.edu/12902 |
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| Jones, Randall E.; Cacho, Oscar J.. |
| It is argued in this paper that static approaches to weed management, where the benefits and costs are only considered within a single season, are inappropriate for assessing the economic benefits of weed control technologies. There are carryover effects from weed management as weeds that escape control in one season may reproduce and replenish weed populations in following seasons. Consequently, it is appropriate to view weed control in the context of a resource management problem where the goal is to determine the optimal inter-temporal level of weed control that maximises economic benefits over some pre-determined period of time. A dynamic optimisation model for weed control is presented. Using the tools of comparative static analysis and Pontryagin's... |
| Tipo: Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/123685 |
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| Alford, Andrew R.; Griffith, Garry R.; Cacho, Oscar J.. |
| The benefits of evaluating a new technology in a whole-farm context using a linear programming framework are well known. Linear programming allows the joint evaluation of concurrent farm activities, while considering the costs and returns of all enterprises and any resource adjustments imposed by adoption of the technology. This Report provides a rationale for and description of a whole-farm linear programming model that can be used for the economic evaluation of new technologies that are applicable to beef/sheep grazing farms typical of the Northern Tablelands of New South Wales. In this farming system, the whole-farm focus incorporates various aspects of the pasture base, resource constraints and sheep and cattle interactions. An overview of economic... |
| Tipo: Report |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2003 |
URL: http://purl.umn.edu/28010 |
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| Moss, Jonathan; Cacho, Oscar J.; Mounter, Stuart W.. |
| With the impending introduction of an Australian Carbon Pollution Reduction Scheme, farmers and landholders in rural Australia have increased opportunities to participate in the market. This includes the adoption of land-use change to sequester additional carbon in exchange for carbon credits and the production of a renewable energy source (biofuels). However, these land-use changes compete with existing farm enterprises and may contain significant transaction costs. Therefore it is necessary for the institutional arrangements to provide adequate incentives for landholders to adopt these land-use changes. This paper examines the potential supply of these land-use changes for climate mitigation from landholders in a northern NSW catchment. These results... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Border Rivers-Gwydir; Carbon sequestration; Land-use change; Resource /Energy Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/59104 |
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| Cacho, Oscar J.; Lipper, Leslie. |
| Agroforestry projects have the potential to help mitigate global warming by acting as sinks for greenhouse gasses. However, participation in carbon-sink projects may be constrained by high costs. This problem may be particularly severe for projects involving smallholders in developing countries. Of particular concern are the transaction costs incurred in developing projects, measuring, certifying and selling the carbon-sequestration services generated by such projects. This paper addresses these issues by analysing the implications of transaction and abatement costs in carbon-sequestration projects. A model of project participation is developed, which accounts for the conditions under which both buyers and sellers would be willing to engage in a carbon... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agroforestry; Climate Policy; Carbon Sequestration Costs; Environmental Economics and Policy; Q23; Q57; O1; O13. |
| Ano: 2007 |
URL: http://purl.umn.edu/9324 |
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| Farquharson, Robert J.; Cacho, Oscar J.; Turpin, J.E.. |
| Issues of long term soil fertility decline and sustainability are becoming more important for cropping industries in Australia. Helping to manage the level of soil fertility in this context is an aim of economic response analysis. This paper reviews the theory and methods used by economists to derive the optimal level of an input to be used in a production process. In particular, response functions generated by a crop simulation model are used as a basis for the analysis. The use of such models is becoming widespread in the research and extension community. A variety of methods are presented, in increasing order of complexity, to account for the real world characteristics of the production environment in this context. |
| Tipo: Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/123634 |
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| Cacho, Oscar J.; Hester, Susan M.. |
| Invasive species can cause significant damage to natural environments, agricultural systems, human populations and the economy as a whole. Biological invasions are complex dynamic systems which are inherently uncertain and their control involves allocation of surveillance and treatment resources in space and time. A complicating factor is that there are at least two types of surveillance: active and passive. Active surveillance, undertaken by pest control agencies, has high sensitivity but generally low coverage because of its high cost. Passive surveillance, undertaken by the public, has low sensitivity and may have high coverage depending on human population density. Its effectiveness depends on the extent to which information campaigns succeed in... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Search theory; Invasive species; Dispersal; Passive surveillance.; Environmental Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/100535 |
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| Cacho, Oscar J.; Greiner, Romy; Fulloon, Lachlan. |
| Large areas of agricultural land under conventional crops and pastures are at risk of dryland salinisation in Australia. The salinisation problem can be controlled by strategic and large‐scale planting of trees; however, farm forestry enterprises evaluated with conventional discounting techniques do not generally rank as an attractive alternative to annual crops on productive land. In this article, an optimal control model that explicitly accounts for decline or improvement in land quality over a period of 40 years is presented. The optimal area planted to trees and the optimal groundwater‐table trajectory through time are determined under a variety of scenarios. Implications of the results for policy design are discussed. |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2001 |
URL: http://purl.umn.edu/117391 |
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| Cacho, Oscar J.; Fulloon, Lachlan; Greiner, Romy. |
| Dryland salinity emergence is an important land degradation problem in Australia. Large areas of agricultural land where conventional crops and pastures are produced are at risk. The salinisation problem can be controlled by planting trees in conjunction with crops, but a disadvantage of growing trees as a farm enterprise is the long lag between planting and harvest. When farm forestry enterprises are evaluated with conventional discounting techniques they do not generally rank as an attractive alternative to annual crops on productive land. In this paper, a dynamic model that explicitly accounts for decline or improvement in land quality over a period of 40 years is presented. The model is solved for a hypothetical farm on the Liverpool Plains of NSW. The... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Soil salinity; Farm forestry; Dynamic modelling; Farm Management; Land Economics/Use. |
| Ano: 1999 |
URL: http://purl.umn.edu/12895 |
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| Cacho, Oscar J.; Hester, Susan M.; Spring, Daniel. |
| The detectability of invasive organisms influences the feasibility of eradicating an infestation. Search theory offers a framework for defining and measuring detectability, taking account of searcher ability, biological factors and the search environment. In this paper, search theory concepts are incorporated into a population model, and the costs of search and control are calculated as functions of the amount of search effort (the decision variable). Simulations are performed on a set of weed scenarios in a natural environment, involving different combinations of plant longevity, seed longevity and plant fecundity. Results provide preliminary estimates of the cost and duration of eradication programs to assist in prioritising weeds for control. The... |
| Tipo: Article |
Palavras-chave: Bioeconomics; Invasive species; Operations research; Population dynamics; Weed control; Resource /Energy Economics and Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/118522 |
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| Cacho, Oscar J.; Hean, Robyn L.; Wise, Russell M.. |
| The emission of greenhouse gases, particularly carbon dioxide, and the consequent potential for climate change are the focus of increasing international concern. Temporary land-use change and forestry projects (LUCF) can be implemented to offset permanent emissions of carbon dioxide from the energy sector. Several approaches to accounting for carbon sequestration in LUCF projects have been proposed. In the present paper, the economic implications of adopting four of these approaches are evaluated in a normative context. The analysis is based on simulation of Australian farm–forestry systems. Results are interpreted from the standpoint of both investors and landholders. The role of baselines and transaction costs are discussed. |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/116186 |
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| Odem, Doreen; Sinden, Jack A.; Cacho, Oscar J.; Griffith, Garry R.. |
| Scotch broom (Cytisus scoparius, L.), is an exotic leguminous shrub, native to Europe, which invades pastoral and woodland ecosystems and adjoining river systems in cool, high rainfall regions of southeastern Australia. Broom has invaded 10,000 hectares of eucalypt woodland at Barrington Tops National Park in New South Wales, and is having a major impact on the natural ecology of the sub-alpine environment. It is extremely competitive with the native flora, retarding their growth and in many areas blanketing the ground and preventing growth of many understorey species in open forest areas. An active program to manage this invasion is being implemented by the National Parks and Wildlife Service. The management issues include whether eradication or... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Scotch broom; Economic issues; Management issues; Natural environments; Bioeconomic model; Environmental Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/58193 |
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| Registros recuperados: 38 | |
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