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| Registros recuperados: 17 | |
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| Dillon, Carl R.; Mjelde, James W.; McCarl, Bruce A.. |
| Economic feasibility of Texas Blacklands corn production in relation to sorghum, wheat, and cotton is studied. Biophysical simulation generated yield data are integrated with an economic decision model using quadratic programming. Given the various scenarios analyzed, corn is economically feasible for the Blacklands. A crop mix of half corn and half cotton production is selected under risk neutrality with wheat entering if risk aversion is present. Corn and grain sorghum production are highly substitutable. Profit effects attributed to changing corn planting dates are more pronounced than profit changes resulting from altering corn population or maturity class. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1989 |
URL: http://purl.umn.edu/30189 |
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| Dixon, Bruce L.; Garcia, Philip; Adams, Richard M.; Mjelde, James W.. |
| Duality methods utilizing a profit function framework are employed to estimate the output elasticity of ambient ozone levels on cash grain farms in Illinois. While duality methods have been recommended as a cure to many of the statistical problems of direct estimation of production functions, multicollinearity may still be a problem. A method for utilizing stochastic information on parameters of a seemingly unrelated system of equations, which is implied by profit function estimation, is developed and applied to measuring the impact of ozone. Such an approach may be necessary in measuring other environmental effects because of a lack of regressor variability. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Environmental Economics and Policy. |
| Ano: 1984 |
URL: http://purl.umn.edu/32140 |
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| Talpaz, Hovav; Mjelde, James W.. |
| A method for optimizing the irrigation schedule is presented. When the response surface, generated by experimenting with the crop simulation models is concave (convex), an optimal solution can be found. The process is iteratively repeated till convergence is achieved. Corn irrigation scheduling is demonstrated, with soil moisture levels as control variables. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1988 |
URL: http://purl.umn.edu/32115 |
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| Harper, Jayson K.; Mjelde, James W.; Rister, M. Edward; Way, Michael O.; Drees, Bastiaan M.. |
| The rice stink bug is a major pest of rice in Texas, causing quality related damage. The previous threshold used for assisting in rice stink bug spray decisions lacked flexibility in economic and production decision variables and neglected the dynamics of the pest population. Using stochastic dynamic programming, flexible economic thresholds for the rice stink bug were generated. The new thresholds offer several advantages over the old, static thresholds, including increased net returns, incorporation of pest dynamics, user flexibility, ease of implementation, and a systematic process for updating. |
| Tipo: Journal Article |
Palavras-chave: Economic thresholds; Dynamic programming; Pest management; Rice; Crop Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/15411 |
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| Mjelde, James W.; Dixon, Bruce L.; Sonka, Steven T.. |
| Results of comparing updating versus nonupdating modeling assumptions call into question the use of models based on nonupdating strategies as valid representations of actual farmer actions. If farmers are sequential updaters, the results indicate that models assuming no updating are inaccurate. The degree of this inaccuracy ranges between 4% and 10% of profits for the study area. Further, the results indicate that updating appears to be important for both descriptive and prescriptive studies of farmer behavior. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1989 |
URL: http://purl.umn.edu/32447 |
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| Mjelde, James W.; Capps, Oral, Jr.; Griffin, Ronald C.. |
| Impacts of alternative specifications for heteroscedastic error structures are examined by estimating various production functions for corn in Central Texas. Production- and profit- maximizing levels of input and the shape of the profit equation obtained from models not corrected for heteroscedasticity differed from those obtained from models corroded for heteroscedasticaity. Using the profit-maximizing input levels for each production function gave essentially the same estimated yield and profit, regardless of the specification for heteroscedasticity employed. Differences of up to one-quarter to one-third are noted, however, in the amount of profit-maximizing levels of input used, depending on the heteroscedasticity correction. |
| Tipo: Journal Article |
Palavras-chave: Corn; Heteroscedasticity; Production function; Research Methods/ Statistical Methods. |
| Ano: 1995 |
URL: http://purl.umn.edu/15329 |
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| Larsen, Ryan A.; Mjelde, James W.; Klinefelter, Danny A.; Wolfley, Jared L.. |
| Yield correlations between 380 different counties are calculated for non-irrigated wheat. Using this data, a function is estimated that shows the relationship between correlation and changes in geographic and climate data. In addition movement variables are included added to the specification to capture the impact of moving from one production region to another. A negative relationship was found between changes in latitude, longitude, precipitation, elevation, and temperature. Correlations and longitude and precipitation showed downward sloping concave relationship, whereas correlations and latitude showed downward sloping convex relationships. Changes in latitude and longitude are found to have greatest impact on correlation with elasticities of -1.54... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Yield Correlations; Geographical Diversification; Farm Management; Agribusiness; Crop Production/Industries; Farm Management; Risk and Uncertainty. |
| Ano: 2009 |
URL: http://purl.umn.edu/46819 |
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| Wolfley, Jared L.; Mjelde, James W.; Klinefelter, Danny A.; Salin, Victoria. |
| Contractual arrangements for joint machinery ownership between independent agribusinesses are explored. A two-farm economic simulation model of locations in Texas, Colorado, and Montana is developed to provide insight associated with sharing combines. Important variables include combine size (efficiency), yield losses resulting from untimely access to equipment, the penalty structure for untimely delivery, and cost-sharing and depreciation deductions claimed between producers. Combine sharing is risk-reducing in most cases. The gains to both parties are lowest when harvesting periods overlap. While the value of sharing is positive under many scenarios, benefits from sharing are small relative to total farm revenue. |
| Tipo: Journal Article |
Palavras-chave: Combines; Machinery sharing; Risk; Simulation; Agribusiness; Agricultural Finance. |
| Ano: 2011 |
URL: http://purl.umn.edu/105536 |
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| Mjelde, James W.; Cochran, Mark J.. |
| A methodological approach to obtain bounds on the value of information based on an inexact representation of the decision makers utility function is presented. Stochastic dominance procedures are used to derive the bounds. These bounds provide more information than the single point estimates associated with traditional decision analysis approach to valuing information, in that classes of utility functions can be considered instead of one specific utility function. Empirical results for valuing seasonal climate forecasts illustrate that the type of management strategy given by the decision makers prior knowledge interacts with the decision makers risk preferences to determine the bounds. |
| Tipo: Journal Article |
Palavras-chave: Risk and Uncertainty. |
| Ano: 1988 |
URL: http://purl.umn.edu/32118 |
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| Lee, Andrew C.; Conner, J. Richard; Mjelde, James W.; Richardson, James W.; Stuth, Jerry W.. |
| Large-scale brush-control programs are being proposed in Texas to increase off-site water yields. Biophysical and economic simulation models are combined to estimate the effects of brush control on representative ranches in four ecological regions of the Edwards Plateau area of Texas. Net present values of representative ranches in three of four regions decrease with brush control. Cost shares necessary for ranches from the three regions to break even range from 7% to 31% of total brush-control costs. Any large-scale brush-control program will therefore require a substantial investment by the state of Texas. |
| Tipo: Journal Article |
Palavras-chave: Agribusiness. |
| Ano: 2001 |
URL: http://purl.umn.edu/31036 |
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| Rubas, Debra J.; Mjelde, James W.; Love, H. Alan. |
| Previous climate information studies have used static models to estimate the benefits of using seasonal forecasts. Technology adoption studies, on the other hand, have used dynamic models but have examined the benefits of adoption ex post. The objective of this study is to examine ex ante the effects of climate forecast adoption on the international wheat market over time. Two general sets of scenarios are analyzed. The first set assumes all wheat-producers within a country or set of countries adopt the forecasts, while producers in the remaining country (ies) do not. Next, producers adopt sequentially over time based on S-shaped adoption curves, whose rates vary by country. Welfare implications are examined and compared in the different scenarios.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/22160 |
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| Registros recuperados: 17 | |
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