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| Marra, Michele C.; Hubbell, Bryan J.; Carlson, Gerald A.. |
| In 1996, Bt cotton became one of the first genetically engineered crops to be available commercially. This study focuses on the various sources and quality of information about Bt cotton profitability available to farmers in the Southeast and assesses the relative importance of such information in the farmers' adoption decisions. A model of the individual decision to adopt is developed to incorporate two recent theories of the role of information quality (the "effective information" hypothesis and the "popularity" hypothesis) as well as the effect of current technology depreciation. The data show some support for all three factors as determinants of adoption. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/31158 |
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| Hubbell, Bryan J.; Florkowski, Wojciech J.; Oetting, R.; Braman, S.K.; Robacker, C.D.. |
| Firm characteristics and managers' attitudes and opinions about pesticide safety were used to classify lawn care and landscape management firms into four categories and compare them using the logit procedure. Survey data obtained from 223 firms was used in the empirical investigation of the adoption of the IPM techniques. Results showed the need for continued transfer of new technology to independently owned firms, multidisciplinary assessment of IPM methods before their transfer to ascertain the economic viability of proposed methods, public investment in programs training workers in knowledge-based pesticide applications, possible assistance in obtaining capital, and investment in consumer education. |
| Tipo: Journal Article |
Palavras-chave: Attitudes; Cluster analysis; IPM; Logit model; Management; Survey; Agribusiness. |
| Ano: 2001 |
URL: http://purl.umn.edu/15286 |
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| Hubbell, Bryan J.; Welsh, Rick. |
| Geographic concentration in U.S. hog production from 1974-96 is investigated using a measure based on Theil's entropy index. For the U.S. as a whole, geographic concentration is occurring at a slow rate, both for hog farms and hog numbers. However, for particular states, primarily in the new Southern Atlantic production region, concentration is high and increasing at a rapid pace. Concentration was increasing for the 23-year period for 16 out of the 20 states in the analysis. Results indicate that geographic concentration by augmentation is occurring to the greatest degree in Arkansas, Missouri, North Carolina, Oklahoma, and Pennsylvania. |
| Tipo: Journal Article |
Palavras-chave: Entropy; Geographic concentration; Hog production; Livestock Production/Industries. |
| Ano: 1998 |
URL: http://purl.umn.edu/15566 |
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| Hubbell, Bryan J.. |
| The number of insecticide applications made by an apple grower to control an insect infestation is modeled as a geometric random variable. Insecticide efficacy, rate per application, month of treatment, and method of application all have significant impacts on the expected number of applications. The number of applications to control a given insect population is dependent on the probability of achieving successful control with a given application. Results suggest that northeastern growers have the highest and mid-Atlantic growers the lowest probability of controlling an infestation with a given application. Results also indicate that scales require the least and moths the most number of applications. Growers are not responsive to per unit insecticide... |
| Tipo: Journal Article |
Palavras-chave: Apples; Count data; Geometric; Insect control; Pesticides; Crop Production/Industries. |
| Ano: 1997 |
URL: http://purl.umn.edu/15047 |
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