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| Registros recuperados: 66 | |
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| Chalak-Haghighi, 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: Conference Paper or Presentation |
Palavras-chave: Environment; Economics; Weed; Stochastic; Optimisation; Management; Environmental Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/58886 |
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| Monjardino, Marta; Pannell, David J.; Powles, Stephen B.. |
| Herbicide resistance has become a major problem in Australian dryland agriculture. This situation has resulted from the repeated use of herbicides in place of the traditional weed control provided by cultivation and grazing. Farmers have addressed the problem of herbicide resistance by adopting a system of integrated weed management that allows weed control with a range of different techniques and herbicides. One of the non-chemical methods being considered by farmers is “green manuring”, which involves ploughing a healthy growing crop or pasture into the soil in order to prevent weed seed production and provide other benefits. In this study, the trade-offs between the effective weed control and biological benefits provided by green manuring and the large... |
| Tipo: Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/123707 |
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| Pannell, David J.; Roberts, Anna M.; Park, Geoff; Curatolo, April; Marsh, Sally P.. |
| INFFER (Investment Framework for Environmental Resources) was developed to help investors of public funds to improve the delivery of outcomes from environmental programs. It assists environmental managers to design projects, to select delivery mechanisms, and to rank competing projects on the basis of benefits and costs. The design of INFFER and the activities of the INFFER projects are based on extensive experience of working with environmental managers and policy makers. This experience has highlighted a number of important practical lessons, that have strongly influenced the design and implementation of INFFER. These lessons include the need for simplicity, training and support of users, trusting relationships with users, transparency, flexibility,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/59148 |
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| Marsh, Sally P.; Curatolo, April; Pannell, David J.; Park, Geoff; Roberts, Anna M.; Alexander, Jennifer. |
| Investment in natural resource management (NRM) by regional organisations in Australia has been widely criticised for failing to achieve substantial environmental outcomes. The Investment Framework for Environmental Resources (INFFER) is a tool for developing and prioritising projects to address environmental issues such as water quality, biodiversity decline, environmental pest impacts and land degradation. INFFER is an asset-based, targeted, and outcome-focussed approach to environmental investment, and as such is a very different and more rigorous approach to prioritising possible environmental projects than used previously by most catchment management organisations (CMOs) in Australia. From 2008 to 2010 INFFER has been trialled with CMOs. Evaluation... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: NRM investment planning; NRM investment prioritisation; Regional catchment management organisations; NRM policy; Environmental planning; Environmental prioritisation; Environmental policy; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Q50; Q58. |
| Ano: 2011 |
URL: http://purl.umn.edu/100584 |
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| Pannell, David J.. |
| Australian research into the economics of privately and publicly funded weed control is reviewed. Of the published studies that consider farm-level problems, most have been simplistic. Complexities which affect a farmer's optimal control strategies for crop and pasture weeds are outlined. The determination of herbicide rates on an economic basis is proposed as an area for further work. The traditional economic threshold concept is not suitable for this purpose. Studies of the economics of public weed control programs are slightly more common than farm-level studies in the literature, although work on public weed problems has focussed on just a few weed species. Future directions for weed economics research are suggested. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1988 |
URL: http://purl.umn.edu/12278 |
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| Pannell, David J.; McFarlane, Donald J.; Ferdowsian, Ruhi. |
| Dryland salinity has been conceived of as a problem involving massive off-site impacts and therefore requiring coordinated action to ensure that land managers reduce those off-site impacts. In economic terms, salinity is seen as a problem of market failure due to externalities, including external costs from one farmer to another and from the farm sector to the non-farm sector. In this paper, we argue that, at least in Western Australia (WA), externalities are much less important as a cause of market failure than has been widely believed. If all externalities from salinity in WA were to be internalised, the impact of this on farm management would be small. There are a number of factors contributing to this conclusion, both hydrological and socioeconomic.... |
| Tipo: Presentation |
Palavras-chave: Farm Management; Marketing. |
| Ano: 2000 |
URL: http://purl.umn.edu/123715 |
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| Doole, Graeme J.; Pannell, David J.. |
| Use of lucerne (Medicago sativa L.) pastures in crop rotations has been proposed as a method to enhance weed management options for growers facing herbicide resistance in Western Australia. An existing model for analysing herbicide resistance in the important crop weed annual ryegrass (Lolium rigidum Gaud.) is consequently extended to include lucerne, used for grazing by a sheep enterprise. Seven rotational options are analysed, including various combinations of lucerne, annual pastures, and crops. Lucerne provides additional weed management benefits across the rotation, but in the region studied these benefits are only sufficient to make lucerne rotations the most profitable option in situations where ryegrass is resistant to multiple herbicide groups,... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop Production/Industries. |
| Ano: 2007 |
URL: http://purl.umn.edu/9233 |
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| Kragt, Marit Ellen; Pannell, David J.; Robertson, Michael J.; Thamo, Tas. |
| This paper has been published in a peer-reviewed journal as: Kragt, M.E., Pannell, D.J., Robertson, M.J. & Thamo, T. (2012) Assessing costs of soil carbon sequestration by crop-livestock farmers in Western Australia, Agricultural Systems, 112: 27-37. DOI: 10.1016/j.agsy.2012.06.005 |
| Tipo: Working or Discussion Paper |
Palavras-chave: APSIM; Bioeconomic Modelling; Carbon Farming; Climate Change Mitigation; MIDAS; Soil Carbon Sequestration; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management. |
| Ano: 2011 |
URL: http://purl.umn.edu/109247 |
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| Pannell, David J.. |
| The relevance of expert systems in agricultural economics research and extension is examined. Some of the limitations of existing expert systems are described. Expert systems are useful for storing and retrieving knowledge and for solving diagnostic problems but not for mathematical optimisation. The common method of handling uncertainty in expert systems is shown to have a dubious theoretical basis. Expert systems have no facility for sensitivity analysis. It is concluded that expert systems are unlikely to replace traditional analytical tools for the solution of economic problems but that they may be useful for creation of user-friendly program interfaces. |
| Tipo: Journal Article |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1988 |
URL: http://purl.umn.edu/12560 |
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| Marsh, Sally P.; Pannell, David J.. |
| In most states of Australia, agricultural extension policies and practices have increasingly been based on considerations of private/public goods, user pays and cost recovery. In addition, the delivery of extension has been strongly influenced by changing administrative structures and a change in the paradigm within which the extension community operates. These changes have had major impacts, including more extension being delivered by the private sector. There are positive aspects to the changes and, for some issues, they are appropriate. However, we have a number of reservations, particularly about the effectiveness of current extension systems in assisting the adoption of complex environmental and farming system technologies. |
| Tipo: Journal Article |
Palavras-chave: Teaching/Communication/Extension/Profession. |
| Ano: 2000 |
URL: http://purl.umn.edu/117854 |
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| Doole, Graeme J.; Pannell, David J.. |
| Simulation models are valuable tools in the analysis of complex, highly constrained economic systems unsuitable for solution by mathematical programming. However, model size may hamper the efforts of practitioners to efficiently identify the most valuable configurations. This paper investigates the efficacy of a new metaheuristic procedure, compressed annealing, for the solution of large, constrained systems. This algorithm is used to investigate the value of incorporating a sown annual pasture, French serradella (Ornithopus sativa Brot. cv. Cadiz), between extended cropping sequences in the central wheat belt of Western Australia. Compressed annealing is shown to be a reliable means of considering constraints in complex optimisation problems in... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Combinatorial optimisation; Crop rotation; Simulated annealing; Research Methods/ Statistical Methods; C63; Q15. |
| Ano: 2007 |
URL: http://purl.umn.edu/10438 |
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| Pannell, David J.; McFarlane, Donald J.; Ferdowsian, Ruhi. |
| Dryland salinity has been conceived of as a problem involving massive off‐site impacts and therefore requiring coordinated action to ensure that land managers reduce those off‐site impacts. In economic terms, salinity is seen as a problem of market failure due to externalities, including external costs from one farmer to another and from the farm sector to the non‐farm sector. In this article, we argue that, at least in Western Australia (WA), externalities are much less important as a cause of market failure than has been widely believed. If all externalities from salinity in WA were to be internalised, the impact on farm management would be small. |
| Tipo: Journal Article |
Palavras-chave: Land Economics/Use. |
| Ano: 2001 |
URL: http://purl.umn.edu/117571 |
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| Pannell, David J.. |
| A biologically realistic model of crop yield response to herbicide application is presented. It includes functions for weed mortality from herbicide application and yield loss due to surviving weeds. The optimal herbicide rate and two types of decision thresholds are derived theoretically and illustrated with empirical examples. Responses of the various decision criteria to changes in parameters are also examined theoretically and empirically. A multidimensional threshold for weeds based on weed density and weed-free yield is presented. The issue of farmers using other than officially recommended herbicide rates is discussed. |
| Tipo: Journal Article |
Palavras-chave: Risk and Uncertainty. |
| Ano: 1990 |
URL: http://purl.umn.edu/22352 |
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| Pannell, David J.. |
| A number of Australian governments have established or planned programs to assist farmers in adapting to climate change. This paper considers a potential range of policy responses that may be appropriate for climate change adaptation in agriculture. It discusses the extent to which different policy responses may be justified on the basis of market-failure and the likelihood of positive net benefits. While research and extension have the potential to generate significant benefits, there is a need to carefully consider their rationales and emphases. Given the characteristics of climate change (slow, highly uncertain, small relative to climate variability, spatially heterogeneous), the value of information from research and extension to guide farmers’... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/59149 |
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| Pannell, David J.; Roberts, Anna M.; Park, Geoff; Curatolo, April; Marsh, Sally P.; Alexander, Jennifer. |
| This is a pre-publication version of: Pannell, D.J., Roberts, A.M., Park, G., Alexander, J., Curatolo, A. and Marsh, S. (2012). Integrated assessment of public investment in land-use change to protect environmental assets in Australia, Land Use Policy 29(2): 377-387. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental Economics and Policy; Resource /Energy Economics and Policy; Q20; Q50. |
| Ano: 2011 |
URL: http://purl.umn.edu/102455 |
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| Registros recuperados: 66 | |
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