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CHANCE CONSTRAINED PROGRAMMING MODELS FOR RISK-BASED ECONOMIC AND POLICY ANALYSIS OF SOIL CONSERVATION AgEcon
Zhu, Minkang; Taylor, Daniel B.; Sarin, Subhash C.; Kramer, Randall A..
The random nature of soil loss under alternative land-use practices should be an important consideration of soil conservation planning and analysis under risk. Chance constrained programming models can provide information on the trade-offs among pre-determined tolerance levels of soil loss, probability levels of satisfying the tolerance levels, and economic profits or losses resulting from soil conservation to soil conservation policy makers. When using chance constrained programming models, the distribution of factors being constrained must be evaluated. If random variables follow a log-normal distribution, the normality assumption, which is generally used in the chance constrained programming models, can bias the results.
Tipo: Journal Article Palavras-chave: Risk and Uncertainty.
Ano: 1994 URL: http://purl.umn.edu/31324
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ECONOMIC RETURNS FROM REDUCING POULTRY LITTER PHOSPHORUS WITH MICROBIAL PHYTASE AgEcon
Bosch, Darrell J.; Zhu, Minkang; Kornegay, Ervin T..
Requiring that crop applications of manure be based on phosphorus content (P-standard) could increase poultry litter disposal costs. Microbial phytase reduces litter P content and could reduce litter disposal costs under a P-standard. For a representative Virginia turkey farm, phytase costs $2,500 and could increase value of litter used for fertilizer on the turkey farm by $390 and reduce supplemental P feed costs by $1,431. Based on assumed litter demand and supply, estimated litter export prices with phytase could exceed export prices without phytase by $3.81 per ton. Phytase net returns to the farm are an estimated $ 1,435.
Tipo: Journal Article Palavras-chave: Economic returns; Microbial phytase; Nutrient management; Phosphorus; Poultry litter; Water quality; Livestock Production/Industries.
Ano: 1997 URL: http://purl.umn.edu/15056
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