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| Registros recuperados: 14 | |
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| Westenbarger, David A.; Frisvold, George B.. |
| While many studies have estimated the impacts of air pollution on crop yields on experimental plots, few have estimated these impacts under actual farm production conditions. This study econometrically estimates the impact of air pollution on corn and soybean yields, controlling for weather, soil quality and management practices, using farm-level data for the eastern United States. Ozone pollution was found to reduce yields for both crops. The mean elasticity of yield with respect to ozone exposure was -0.19 for corn and -0.54 for soybeans. The benefits of ozone standards to protect crops, measured in terms of crop revenues, range from $17 to $82 million depending on the stringency of the standard. Over 85 percent of the revenue gains are captured by... |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Environmental Economics and Policy. |
| Ano: 1995 |
URL: http://purl.umn.edu/31603 |
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| Day-Rubenstein, Kelly A.; Heisey, Paul W.; Shoemaker, Robbin A.; Sullivan, John; Frisvold, George B.. |
| Crop genetic resources are the basis of agricultural production, and significant economic benefits have resulted from their conservation and use. However, crop genetic resources are largely public goods, so private incentives for genetic resource conservation may fall short of achieving public objectives. Within the U.S. germplasm system, certain crop collections lack sufficient diversity to reduce vulnerability to pests and diseases. Many such genetic resources lie outside the United States. This report examines the role of genetic resources, genetic diversity, and efforts to value genetic resources. The report also evaluates economic and institutional factors influencing the flow of genetic resources, including international agreements, and their... |
| Tipo: Report |
Palavras-chave: Genetic resources; Genetic diversity; Germplasm; R&D; International transfer of genetic resources; In situ conservation; Ex situ conservation; Gene banks; Intellectual property.; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2005 |
URL: http://purl.umn.edu/59388 |
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| Frisvold, George B.. |
| This study estimated a dynamic logistic model to explain the diffusion Bt cotton in the United States. Regional differences in the speed and extent of Bt cotton adoption were explained by differences in availability of Bt seed adapted to local conditions, potential seed supplier profits, and economic variables affecting grower gains from adoption. The study also estimated the impact of Bt cotton on insecticide use, controlling for differences in pest infestations and prices and correcting for the endogeneity of the Bt adoption decision. Bt cotton significantly reduced insecticide applications to control target pests cotton bollworm, tobacco budworm, and pink bollworm. Bt cotton has led to an overall reduction in these applications per total US cotton... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2004 |
URL: http://purl.umn.edu/36223 |
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| Buyuktahtakin, Esra; Feng, Zhuo; Olsson, Aaryn; Frisvold, George B.; Szidarovszky, Ferenc. |
| This paper models control of invasive buffelgrass (Pennisetum ciliare), a fire-prone African bunchgrass spreading rapidly across the southern Arizona desert as a spatial dynamic process. Buffelgrass spreads over a gridded landscape. Weed carrying capacity, treatment costs, and damages vary over grid cells. Damage from buffelgrass depends on its spatial distribution in relation to valued resources. We conduct positive analysis of recommended heuristic strategies for buffelgrass control, evaluating their ability to prevent weed establishment and to reduce damage indices over time. The high dimensionality of the problem makes full dynamic optimization intractable. However, two heuristic strategies – potential damage weighting and consecutive year treatment –... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Invasive species; Integer programming; Crop Production/Industries; Environmental Economics and Policy; Q57; Q58. |
| Ano: 2010 |
URL: http://purl.umn.edu/61753 |
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| Frisvold, George B.. |
| This paper develops and econometrically tests a model of labor contractual choice in developing countries, focusing on the choice between directly hiring labor on a spot market versus reliance on labor contractors. The theoretical model examines the role of market prices and factor endowments on contract choice and the role of labor contracting as an institutional innovation to reduce transactions costs associated with the use of hired labor. Econometric results confirm hypotheses that contracting becomes more profitable as farm size and collateral ownership increase, as family size decreases, and with tightening of the casual labor market. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Labor and Human Capital. |
| Ano: 2005 |
URL: http://purl.umn.edu/19495 |
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| Registros recuperados: 14 | |
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