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Energy use in cropping systems : a regional long - term exploratory analysis of energy allocation and efficiency in the Inland Pampa [Argentina]

Por: Ferraro, Diego Omar.
ISSN: 0360-5442.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): AGROECOSYSTEMS | ARGENTINA | CART | ENERGY | SUSTAINABILITY | AGRICULTURAL SYSTEM | AGRO-ECOSYSTEMS | CLASSIFICATION AND REGRESSION TREE | CROP FIELDS | CROPPING SYSTEMS | DATABASE STRUCTURES | ENERGY ALLOCATIONS | ENERGY USAGE | ENERGY USE | ENERGY-USE EFFICIENCY | EXPLANATORY VARIABLES | EXPLORATORY ANALYSIS | FRONTIER ANALYSIS | NATURAL PROCESS | PER UNIT | STUDY AREAS | TECHNICAL EFFICIENCY | UPWARD TREND | AGRICULTURAL MACHINERY | CROPS | ENERGY UTILIZATION | OILSEEDS | SUSTAINABLE DEVELOPMENT | THERMODYNAMICS | ENERGY EFFICIENCY | ABANDONED LAND | AGRICULTURAL ECOSYSTEM | CROPPING PRACTICE | DATABASE | FARMING SYSTEM | NATURAL RESOURCE | SOYBEAN | SUSTAINABILITY | TILLAGE | TIME SERIES | PAMPAS | GLYCINE MAX | HELIANTHUS | TRITICUM AESTIVUM | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Energy vol.44, no.1 (2012), p.490-497Resumen: As agricultural system comprises natural processes that are ruled by thermodynamics, the energy utilization is well suited for assessing the sustainability in the management of natural resources. The goals of this paper are 1] to assess the energy use efficiency of the main crops during the 1992-2005 period in Inland Pampa [Argentina]; 2] to evaluate the database structure in terms of energy allocation; 3] to assess the changes in technical efficiency using frontier analysis and 4] to identify the best explanatory variables for energy efficiency variability. Results showed an upward trend in productivity per unit area in the crops analyzed [excluding sunflower]. Summer soybean and sunflower showed higher energy efficiency values by the end of time series. The main shift in the energy use pattern was the reduction of the energy allocated to tillage. The overall performance of the wheat and soybean crops in the study area appears to be closer to the energy usage pattern shown by the top 5 percent energy use efficiency crop fields. The exploratory analysis using classification and regression trees [CART] revealed that the energy allocation to tillage; and the crop specie were the attributes that mainly explained the energy efficiency changes.
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As agricultural system comprises natural processes that are ruled by thermodynamics, the energy utilization is well suited for assessing the sustainability in the management of natural resources. The goals of this paper are 1] to assess the energy use efficiency of the main crops during the 1992-2005 period in Inland Pampa [Argentina]; 2] to evaluate the database structure in terms of energy allocation; 3] to assess the changes in technical efficiency using frontier analysis and 4] to identify the best explanatory variables for energy efficiency variability. Results showed an upward trend in productivity per unit area in the crops analyzed [excluding sunflower]. Summer soybean and sunflower showed higher energy efficiency values by the end of time series. The main shift in the energy use pattern was the reduction of the energy allocated to tillage. The overall performance of the wheat and soybean crops in the study area appears to be closer to the energy usage pattern shown by the top 5 percent energy use efficiency crop fields. The exploratory analysis using classification and regression trees [CART] revealed that the energy allocation to tillage; and the crop specie were the attributes that mainly explained the energy efficiency changes.

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