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| Registros recuperados: 59 | |
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| Ebrahimi, Sajjad; Mesri Gundoshmian, Tarahom; Abdi, Reza; Raei Jadidi, Mehri. |
| The goal of this study was to evaluate the sustainability and efficiency of broiler production with regard to energy consumption in Ardabil province, Iran. To reach the goal, linear programming model and Data Envelopment Analysis (DEA) were employed. Data were collected from the farmers using a face–to–face questionnaire performed in September–December 2014 period. The DEA application results showed that the average values of technical, pure technical and scale efficiency scores of producers were 0.949, 0.988 and 0.960, respectively. Also, energy saving target ratio for broiler production was calculated as 8.33%, indicating that by following the recommendations resulted from this study, about 12316.85 MJ/(1000 bird) of total input energy could be saved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Data Envelopment Analysis; Linear programming; Technical efficiency; Broiler. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3562 |
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| Flores Cruz, Luis Alberto. |
| La focalización de recursos por parte del Gobierno para apoyar la producción de maíz en aquellas zonas con alto potencial productivo requiere la identificación de las zonas más competitivas. Para determinar las zonas productoras de maíz (Zea Mays L.) más competitivas en el Estado de Puebla se formuló y se obtuvo la solución de un modelo de equilibrio espacial e inter-temporal que considera la demanda, la oferta, la distribución de la producción e importaciones, y el abasto del consumo en cada zona consumidora. El modelo usó datos del año promedio 2008-2010 y se obtuvieron cuatro soluciones que corresponden al año base, y a reducciones graduales en la disponibilidad de maíz para consumo proveniente de una disminución en las importaciones estatales. Los... |
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Palavras-chave: Zea mays; Programación lineal; Oferta; Consumo; Linear programming; Supply; Consumption; Import; Economía; Maestría; Importación. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1846 |
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| Zetina Espinosa, Ana Mónica. |
| El desperdicio de agua en la agricultura es un problema que se agrava debido a la escasez, por lo tanto, es importante determinar el precio para optimizar su uso. El objetivo de este estudio es optimizar el patrón de cultivos en el Distrito de Riego 044, Jilotepec, Estado de México, en el ciclo agrícola 2008-2009 y dar un valor económico del agua en posibles escenarios futuros, para lo cual se instrumentó un modelo de programación lineal, en el que se tomaron 37 actividades agrícolas cíclicas y perennes; se introdujeron 62 restricciones. Los resultados mostraron una diferencia de 2.2 millones de pesos entre la situación actual y el óptimo económico. Con un escenario de asignación óptima sin restricción de superficie, el maíz, principal cultivo de la... |
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Palavras-chave: Programación líneal; Óptimo económico; Escasez; Linear programming; Optimized; Shortage; Economía; Maestría. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/82 |
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| Zetina Espinosa, Ana Mónica. |
| El desperdicio de agua en la agricultura es un problema que se agrava debido a la escasez, por lo tanto, es importante determinar el precio para optimizar su uso. El objetivo de este estudio es optimizar el patrón de cultivos en el Distrito de Riego 044, Jilotepec, Estado de México, en el ciclo agrícola 2008-2009 y dar un valor económico del agua en posibles escenarios futuros, para lo cual se instrumentó un modelo de programación lineal, en el que se tomaron 37 actividades agrícolas cíclicas y perennes; se introdujeron 62 restricciones. Los resultados mostraron una diferencia de 2.2 millones de pesos entre la situación actual y el óptimo económico. Con un escenario de asignación óptima sin restricción de superficie, el maíz, principal cultivo de la... |
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Palavras-chave: Programación líneal; Óptimo económico; Escasez; Linear programming; Optimized; Shortage; Economía; Maestría. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/82 |
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| Jesús Lozano, Luis. |
| El objetivo de este estudio fue determinar un patrón óptimo de cultivos en el sector agrícola de la Comarca Lagunera considerando de manera simultánea la maximización de la ganancia y la minimización del consumo de agua, dos criterios de optimización usualmente en conflicto. Se formularon dos modelos, uno de programación lineal para replicar el patrón actual de cultivos como base de referencia en el análisis comparativo, y un segundo modelo de programación compromiso que considera de manera simultánea los objetivos en conflicto. Los resultados indican que una estructura productiva más eficiente que la actual, debería considerar el aumento de la superficie de hortalizas ya que estos cultivos consumen sólo el 5% del recurso agua, pero aportan 21% del... |
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Palavras-chave: Productividad del agua; Programación lineal; Programación compromiso; Water productivity; Linear programming; Compromise programming; Maestría; Economía. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/691 |
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| Keplinger, Keith O.; Hauck, Larry M.. |
| A model of manure utilization is developed and applied to four types of transportable manure. Model results highlight important response differences among manure types and generally illustrate the diseconomies of manure production. For example, as manure production increases, manure value decreases and excess phosphate applications increase, thereby increasing the potential for phosphorus runoff. Policy scenarios limiting the manure application rate reduce manure value and excess phosphate application. Increasing the ratio of land using manure increases manure value while reducing excess phosphate application. Buildup of soil nutrients reduces manure value, but either increases or decreases excess phosphate application depending on the scenario. |
| Tipo: Journal Article |
Palavras-chave: Linear programming; Manure application; Manure transportation; Manure utilization; Manure value; Optimization; Farm Management. |
| Ano: 2006 |
URL: http://purl.umn.edu/8611 |
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| Sintori, Alexandra; Tsiboukas, Kostas. |
| Agricultural activity has been identified as a considerable source of Greenhouse Gas (GHG) emissions. Emissions from ruminant livestock farms are produced particularly due to CH4 emissions from enteric fermentation. Dairy sheep farming is the most important livestock production activity in Greece, characterized by a high degree of farm diversification. This paper addresses the issue of the evaluation of GHG emissions of Greek dairy sheep farms, through the use of a whole farm mathematical programming model that uses farm level data and optimizes total gross margin. Mathematical programming models are an appropriate tool, when addressing complex issues, such as GHG emissions. The analysis is undertaken on different farm types, instead of a representative... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Dairy sheep farming; Linear programming; GHG emissions; Abatement cost; Environmental Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/91812 |
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| Oliveira, Gabriel Leao; Vieira, Wilson da Cruz. |
| The main objective of this work was to analyze the trade between income and risk related to the alternative milk production systems in the region of Viçosa, Minas Gerais, supported by the Federal University of Viçosa and Nestlé. A standard linear programming model provided the identification of the best options among the activities displayed for the maximization of the gross annual income. By means of the rentability calculation of the different milk production systems and risk linked to them it was possible to identify that the milk producers behaved differently in relation to the risk. Generally the producers who are more dependent to the milk activity for their survival are more adverse to risk. |
| Tipo: Journal Article |
Palavras-chave: Risk; Linear programming; Milk production.. |
| Ano: 2006 |
URL: http://purl.umn.edu/43811 |
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| Hoag, Dana L.; Conradie, Beatrice. |
| In this paper the incremental values of water are calculated for irrigators in the Fish-Sundays Scheme of South Africa's Eastern Cape province. The socio-political pressure for redistribution of agricultural resources provided the imperative for this study. The model of the Fish-Sundays Scheme reflects a survey of 50 000ha of fodder and citrus production. It explicitly models the water demand on sixteen typical farms, for five irrigation technologies, six crops and four livestock activities. The existing allocation generates an average value of R0.0423/m3/year, which increases to R0.0681/m3/year if farmer-to-farmer trading is allowed given existing infrastructure. Unrestricted trade raises the average value to R0.0719/m3/year. The marginal cost of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Water value; Irrigation; Linear programming; South Africa; Eastern Cape; Resource /Energy Economics and Policy; Q15; Q12. |
| Ano: 2003 |
URL: http://purl.umn.edu/25832 |
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| Wachenheim, Cheryl J.; Mattson, Jeremy W.. |
| Traditionally, hog production has been concentrated in the Corn Belt region of the United States. During the past decade, North Carolina has become an important hog production state and now ranks second only to Iowa. More recently, expansion in the U.S. hog industry has been in other non-traditional hog production states in the west/west central regions of the United States. In the current study, field peas are considered as a least-cost hog ration ingredient in three U.S. markets. The results of a linear programming analysis suggest that peas can be an attractive alternative as a feed ingredient in hog diets. Even at relatively high prices, peas can be part of the least-cost diet replacing feedstuffs such as corn, barley, and soybean meal. Except at... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Feed peas; Swine diets; Least-cost rations; Linear programming; Livestock Production/Industries. |
| Ano: 2002 |
URL: http://purl.umn.edu/23578 |
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| Registros recuperados: 59 | |
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