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| Registros recuperados: 40 | |
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| Alston, Julian M.; Hyde, Jeffrey; Marra, Michele C.; Mitchell, Paul D.. |
| This study examined the potential economic impacts in the United States of the commercial adoption of a corn rootworm (CRW) resistant transgenic corn. Using a counterfactual approach, we estimated that if the technology had been made available in the year 2000 at a price that would equate per acre costs to those for insecticide-based corn rootworm control, and adopted on all of the acres treated for corn rootworm in that year, the total benefits would have been $460 million. This benefit includes $171 million to the technology developer and seed companies, $231 million to farmers from yield gains, and a further $58 million to farmers from reduced risk, time savings, and other nonpecuniary benefits associated with reduced use of insecticides. This is a... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/57828 |
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| Dun, Zhe; Mitchell, Paul D.. |
| We apply Antweiler’s (2001) double-nested unbalanced panel data model to estimate a western corn rootworm damage function using data from field trials in Illinois and Nebraska. Results imply that expected yield losses for a one unit difference in the node injury scale are 16.4%. Estimated random year and state effects are statistically significant, as is the estimated random experimental effect. The experimental effect is relatively large indicating the tremendous variability in yield losses at the small scale for plots with the same node injury scale measure of root damage. Using the estimated pest damage function to assess the value of Bt corn for farmers in Nebraska and Illinois, we find that, with a mean yield of 200 bu/ac, a yield CV of 25%, a... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/90700 |
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| Mitchell, Paul D.; Rejesus, Roderick M.; Coble, Keith H.; Knight, Thomas O.. |
| The 2008 Farm Bill created the Average Crop Revenue Election (ACRE) program as a new commodity support program. We analyze actual county-level ACRE enrollment rates and a mail survey of farmers just before the ACRE sign-up deadline in Mississippi, North Carolina, Texas and Wisconsin. As discussions begin regarding the next Farm Bill, an understanding of the factors affecting ACRE participation can provide guidance as program changes are discussed. Our empirical analysis of the survey suggest that initial farmer plans to switch to ACRE in 2009 were driven by producer perceptions of whether or not ACRE would pay more than existing programs and whether or not it would provide more risk protection. On the other hand, planning to stay with existing programs in... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Farm Management; Risk and Uncertainty. |
| Ano: 2011 |
URL: http://purl.umn.edu/116705 |
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| Dun, Zhe; Mitchell, Paul D.. |
| Transgenic plants producing insecticidal protein derived from Bacillus thuringiensis (Bt) have been widely adopted since their commercial introduction in 1996. In 2009, 25 countries planted 134 million ha of transgenic crops. The widespread adoption of such plants has reduced use of conventional insecticides while attaining yield gains, thus providing economic, environmental and human health benefits. Because of Bt crops’ high pest control efficacy, there is concern that pests will develop resistance to Bt toxins so that Bt crops are less or no longer effective. To delay the evolution of resistance, the U.S. Environmental Protection Agency (EPA) currently requires Bt crop growers to also plant non-Bt (conventional) crops on a minimum percentage of their... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Welfare; Bt; Pest suppression; Agricultural and Food Policy; Crop Production/Industries. |
| Ano: 2011 |
URL: http://purl.umn.edu/103584 |
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| Mitchell, Paul D.; Gray, Michael E.; Steffey, Kevin L.. |
| This paper describes a composed error model for estimating the conditional distribution of yield loss to serve as an insect damage function. The two-part error separates yield variability due to pest damage from other non-pest factors such as soil heterogeneity, non-uniform application of agronomic practices, and measurement errors. Various common functional forms (linear, quadratic, Cobb-Douglas, negative exponential, hyperbolic, sigmoid) for the pest damage function are presented and parameter estimation is described. As an empirical illustration, the model is used to estimate a damage function for corn rootworm, the most damaging insect pest of corn in the United States. The estimated damage function gives expected proportional yield loss as a... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2002 |
URL: http://purl.umn.edu/19602 |
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| Mitchell, Paul D.; Gray, Michael E.; Steffey, Kevin L.. |
| This paper describes a composed error model for estimating the conditional distribution of yield loss to serve as an insect damage function. The two-part error separates yield variability due to pest damage from other non-pest factors such as soil heterogeneity, non-uniform application of agronomic practices, and measurement errors. Various common functional forms (linear, quadratic, Cobb-Douglas, negative exponential, hyperbolic, sigmoid) for the pest damage function are presented and parameter estimation is described. As an empirical illustration, the model is used to estimate a damage function for corn rootworm, the most damaging insect pest of corn in the United States. The estimated damage function gives expected proportional yield loss as a function... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop Production/Industries. |
| Ano: 2002 |
URL: http://purl.umn.edu/24020 |
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| Mitchell, Paul D.; Buman, Thomas; Buman, Stanley. |
| We specify several count data models, parameterizing the probability densities in terms of their means for easier comparison between models. In addition, we derived a correction of these probability densities for differences in sample sizes, which is a contribution to the count data literature as far as we are aware. We then empirically implement these models using data from a mail survey of firms using prescribed fire to estimate the expected number of escapes from prescribed burns. We find that the not correcting for sample size differences can lead to erroneous conclusions concerning the statistical significance of variables. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2006 |
URL: http://purl.umn.edu/21055 |
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| Mitchell, Paul D.; Knight, Thomas O.. |
| A primary change to crop insurance contained in the USDA's Farm Bill Proposal is Supplemental Deductible Coverage (SDC). SDC would allow farmers who purchase individual crop insurance coverage to purchase GRP in the amount of the individual policy deductible. GRP indemnities would be accelerated compared with the current GRP policy. Analysis indicates that SDC provides substantial benefits in terms of certainty equivalent gains. The largest benefits are realized by low risk farmers, compared to others in the county, and farmers whose yields are highly correlated with the county yield. Optimal individual policy coverage levels generally decrease when SDC is taken. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural and Food Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/92125 |
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| Mitchell, Paul D.; Hurley, Terrance M.; Hellmich, Richard L.. |
| The EPA has imposed mandatory refuge requirements for Bt crops to prolong the efficacy of Bt. Growers have no economic incentive to plant the required refuge because refuge crops are on average less productive and more risky. This paper evaluates refuge insurance--insurance that pays indemnities for yield losses on refuge due to insect damage--as a tool to increase grower compliance incentives. We determine actuarially fair insurance premiums, then evaluate the feasibility of private provision of refuge insurance and its impact on grower incentives to comply with refuge requirements. A private market for refuge insurance appears unlikely because our analysis suggests that even a 2% load on the actuarially fair premium makes growers unwilling to buy... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Risk and Uncertainty. |
| Ano: 2000 |
URL: http://purl.umn.edu/21757 |
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| Seo, Sangtaek; Salin, Victoria; Mitchell, Paul D.; Leatham, David J.. |
| This study determines the entry and exit thresholds of table grape farming with irreversible investment under uncertainty. Real option approach is adopted to consider the investment and management flexibility. Also revenue insurance is introduced to consider the effect of the risk management programs on the entry and exit thresholds. Results show that revenue insurance increases the entry and exit thresholds by 1% and 4%, respectively, thus discouraging new investment and current farming, as long as the revenue guarantee is less than the exit threshold. Revenue insurance increases the entry threshold by 3% and decreases the exit threshold by 13% as long as the revenue guarantee is greater than the exit threshold. In this case, revenue insurance... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Risk and Uncertainty. |
| Ano: 2004 |
URL: http://purl.umn.edu/20229 |
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| Seo, Sangtaek; Mitchell, Paul D.; Leatham, David J.. |
| We analyze the effects of crop insurance and the Marketing Loan Program on optimal nitrogen use and acreage allocation for a case cotton-sorghum farm in Texas. A mathematical programming model is used to simulate the optimal nitrogen fertilizer rate, crop acreage allocation, coverage level, and price election factor, along with participation in the crop insurance (APH and CRC) and the Marketing Loan Program for both crops. Results show that current insurance programs increase the optimal fertilizer rate 1-3% and increase the optimal cotton acreage 16-129%. The Marketing Loan Program slightly changes optimal fertilizer rates and increases optimal cotton acreage an additional 1-9%. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Agricultural and Food Policy; Risk and Uncertainty. |
| Ano: 2004 |
URL: http://purl.umn.edu/20160 |
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| Registros recuperados: 40 | |
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