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| Wicks, Santhi; Howitt, Richard E.. |
| Soil is a capital asset and a renewable resource that requires continued maintenance to ensure the sustainability of agricultural output in the long-run. Growers are continually adjusting the soil's productivity by adding and extracting soil nutrients, and modifying the soil structure through cultivation. Accordingly, we approach sustainable agriculture in terms of capital assets and switching conditions. A theoretical model focusing on cover cropping and soil nitrates shows that profit maximizing farmers' cover cropping decision depend on the price of nitrogen, cost of chemical nitrogen, cost of cover crops and the farmer decision making horizon. In addition, we show that restriction on application of chemical nitrogen for environmental reasons will... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2005 |
URL: http://purl.umn.edu/19230 |
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| Wicks, Santhi; Howitt, Richard E.; Klonsky, Karen. |
| The economic viability of alternative and more sustainable agriculture farming systems depend on the value of farm profits. These values may be estimated through short or long-run of profit maximization, but there is a difference in these methods. In short-run profit maximization the instantaneous marginal benefits are equated to the marginal costs of production. Where as in the long-run maximization of profits the capital value of soil resources are quantify in addition to the direct revenues and costs of each system over time. A long-run approach is fundamental to capture the value of capital improvements in soil resources. In this study we use short-run experimental data from SAFS's rotations to calibrate the crop simulation model EPIC, and obtain a... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Farm Management. |
| Ano: 2006 |
URL: http://purl.umn.edu/21444 |
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| Wicks, Santhi; Allen, Benjamin. |
| Beef cattle producers in Australia have reported an increase in calf losses as a result of wild dog attacks in recent years. However, while control measures may reduce calf losses from wild dog attacks, they may also reduce attacks on kangaroos. Thus, wild dog control measures may inadvertently increase kangaroo competition with cattle for grazing vegetation, which is potentially costly for graziers. In this study the net returns to beef production from investments in wild dog controls in a case study area—omitting the social and environmental effect of wild dogs—is assessed. The case study area for this study includes the natural resource management district groups of Marla–Oodnadatta and Marree–Innamincka, in the South Australian Arid Lands. A... |
| Tipo: Presentation |
Palavras-chave: Livestock Production/Industries. |
| Ano: 2012 |
URL: http://purl.umn.edu/124479 |
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