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| Fernandez-Cornejo, Jorge; McBride, William D.. |
| Adoption of genetically engineered crops with traits for pest management has risen dramatically since their commercial introduction in the mid-1990's. The farm-level impacts of such crops on pesticide use, yields, and net returns vary with the crop and technology examined. Adoption of herbicide-tolerant cotton led to significant increase in yields and net returns, but was not associated with significant changes in herbicide use. On the other hand, increase in adoption of herbicide-tolerant soybeans led to small but significant increases in yields, no changes in net returns, and significant decreases in herbicide use. Adoption of Bt cotton in the Southeast significantly increased yields and net returns and significantly reduced insecticide use. |
| Tipo: Report |
Palavras-chave: Biotechnology; Genetic engineering; Pest management; Field crops; Input traits; Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/33931 |
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| Fernandez-Cornejo, Jorge. |
| The unprecedented growth in crop yields and agricultural total factor productivity over the past 70 years owes much to a series of biological innovations embodied in seeds, beginning with the development of hybrid crops in the United States in the early part of the 20th century, continuing with the adoption of high-yielding varieties during the Green Revolution of the 1960s and 1970s, and more recently, modern biotechnology. Throughout this period, the seed industry evolved, as small businesses gave way to larger enterprises that integrated plant breeding, production, conditioning, and marketing functions. The industry was further shaped by widespread mergers and acquisitions in the latter part of the century, rapid growth - in private research and... |
| Tipo: Report |
Palavras-chave: Seed markets; Seed costs and prices; Regulation; Plant breeding; Field crops; Research and development; Industry concentration; Biotechnology; Agribusiness; Crop Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/33671 |
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| Jordaan, Henry; Grove, Bennie; Jooste, Andre; Alemu, A.G.. |
| The conditional volatility in the daily spot prices of the crops traded on the South African Futures Exchange (yellow maize, white maize, wheat, sunflower seed and soybeans) is determined. The volatility in the prices of white maize, yellow maize and sunflower seed have been found to vary over time, suggesting the use of the GARCH approach in these cases. Using the GARCH approach, the conditional standard deviation is the measure of volatility, and distinguishes between the predictable and unpredictable elements in the price process. This leaves only the stochastic component and is hence a more accurate measure of the actual risk associated with the price of the crop. The volatility in the prices of wheat and soybeans was found to be constant over... |
| Tipo: Journal Article |
Palavras-chave: Price volatility; Field crops; SAFEX; Time series analysis; ARCH/GARCH; Demand and Price Analysis. |
| Ano: 2007 |
URL: http://purl.umn.edu/8013 |
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