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| Teegerstrom, Trent; D'Souza, Gerard E.; Osborne, Phillip; Jones, Kezelee Q.. |
| Contract grazing is compared with retained ownership of cattle using two frameworks-decision theory and portfolio analysis. The study area is West Virginia. Contracting is optimal under a wide range of price and weather scenarios and decision criteria. It also dominates other alternatives based on labor efficiency measures. The optimal portfolio consists of contract grazing and pasture rental, with the results insensitive to small changes in contract grazing returns. The decision theory and portfolio analyses are complementary; together, the two sets of results provide a comprehensive view of the optimal production alternative. Because different agents employ different decision criteria, this approach can increase the utility of results to decision... |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 1997 |
URL: http://purl.umn.edu/31566 |
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| Swinton, Scott M.; Jones, Kezelee Q.; Miller, Neil R.; Schabenberger, O.; Brook, Roger; Warncke, Darryl. |
| Prior research into variable-rate application (VRA) of fertilizer nutrients has found profitability to be lacking in single nutrient applications to U.S. cereal crops. This study examines the yield and cost effects of VRA phosphorus, potassium and lime application on Michigan corn and soybean farm fields in 1998-2001. After four years, we found no yield gain from site-specific management, but statistically significant added costs, resulting in no gain in profitability. Contrary to results elsewhere, there was no evidence of enhanced spatial yield stability due to site-specific fertility management. Likewise, there was no evidence of decreased variability of phosphorus, potassium or lime after VRA treatment. Site-specific response functions and yield... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop Production/Industries. |
| Ano: 2002 |
URL: http://purl.umn.edu/11748 |
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| Swinton, Scott M.; Jones, Kezelee Q.. |
| A conceptual model is developed to measure the value of information from in-field soil sensing technologies as compared with grid and other soil sampling methods. Soil sensing offers greater spatial accuracy and the potential to apply inputs such as nitrogen fertilizer immediately, avoiding changes in nutrient status that occur with delays between soil sampling and fertilizer application. By contrast, soil sampling offers greater measurement accuracy, because it does not rely on proxy variables such as electrical conductivity to infer nutrient status. The average profitability and relative riskiness of soil sensing versus sampling depend upon 1) the trade-off between, on the one hand, the spatial and temporal accuracy of sensing and, on the other hand,... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Farm Management. |
| Ano: 1998 |
URL: http://purl.umn.edu/11674 |
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| Jones, Kezelee Q.; D'Souza, Gerard E.. |
| We explore the transfer of poultry litter among watersheds incorporating both economic characteristics (litter demand and supply) and environmental characteristics (vulnerability to phosphorus runoff, a major pollutant). A combination of techniques was employed: the Lemunyon-Gilbert P-Index model to determine watershed environmental vulnerability, GIS for land use coverages, and a goal focusing model (incorporating Saaty's eigen-value approach for penalty weight estimation) to identify optimal litter shipments among watersheds. Both primary and secondary data were used. The results should be useful to producers and policy makers in the study area and in other areas where poultry production is linked to water quality, and contribute to a more sustainable... |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/31615 |
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