Energy performance of a production system of eucalyptus

Romanelli, Thiago Libório; Milan, Marcos

doi:10.1590/s1415-43662010000800015

Cited by 21 publications

(27 citation statements)

References 19 publications

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“…Width, speed, and field efficiency determines field capacity (21). Depth and soil condition (14) affect the power requirement (17). The power of the fleet (6) determines available power (16).…”

Section: Methodsmentioning

confidence: 99%

Energy-Based Evaluations on Eucalyptus Biomass Production

Romanelli

Milan

Tieppo

2012

International Journal of Forestry Research

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Dependence on finite resources brings economic, social, and environmental concerns. Planted forests are a biomass alternative to the exploitation of natural forests. In the exploitation of the planted forests, planning and management are key to achieve success, so in forestry operations, both economic and noneconomic factors must be considered. This study aimed to compare eucalyptus biomass production through energy embodiment of anthropogenic inputs and resource embodiment including environmental contribution (emergy) for the commercial forest in the Sao Paulo, Brazil. Energy analyses and emergy synthesis were accomplished for the eucalyptus production cycles. It was determined that emergy synthesis of eucalyptus production and sensibility analysis for three scenarios to adjust soil acidity (lime, ash, and sludge). For both, energy analysis and emergy synthesis, harvesting presented the highest input demand. Results show the differences between energy analysis and emergy synthesis are in the conceptual underpinnings and accounting procedures. Both evaluations present similar trends and differ in the magnitude of the participation of an input due to its origin. For instance, inputs extracted from ores, which represent environmental contribution, are more relevant for emergy synthesis. On the other hand, inputs from industrial processes are more important for energy analysis.

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Section: Methodsmentioning

confidence: 99%

Energy-Based Evaluations on Eucalyptus Biomass Production

Romanelli

Milan

Tieppo

2012

International Journal of Forestry Research

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“…Material and energy flow assessment are tools which consider not only energy sources, such as electricity or fuels, but also the energy used to produce inputs, such as pesticides, fertilizers, machines and labor required in production processes (Wiedmann, 2009;Johansson et al, 2012;Romanelli et al, 2012a). Energy flow assessment can provide a view of energy performance which shows how it can be improved and estimated by material flow assessment which is an orderly evaluation of the flows and stocks of materials within a defined system (Pimentel and Patzek, 2005;Hall et al, 2009;Romanelli and Milan, 2010a;Romanelli et al, 2012b;Brunner and Rechberger, 2004).…”

Section: Introductionmentioning

confidence: 99%

Energy embodiment in Brazilian agriculture: an overview of 23 crops

Veiga

Romanelli

Gimenez

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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The amount of energy required to produce a commodity or to supply a service varies from one production system to another and consequently giving rise to differing levels of environmental efficiency. Moreover, since energy prices have been continuously increasing over time, this energy amount may be a factor that has economic worth. Biomass production has a variety of end-products such as food, energy, and fiber; thus, taking into account the similarity in end-product of different crops (e.g.: sunflower, peanuts, or soybean for oil) it is possible to evaluate which crops require less energy per functional unit, such as starch, oil, and protein.This information can be used in decision-making about policies for food safety or bioenergy. In this study, 23 crops were evaluated allowing for a comparison in terms of energy embodied per functional unit. Crops were grouped as follows: starch, oil, horticultural, perennial and fiber, to provide for a deeper analysis of alternatives for the groups, and subsidize further studies comparing conventional and alternative production systems such as organic or genetically modified organisms, in terms of energy. The best energy balance observed was whole sugarcane (juice, bagasse and straw) with a surplus of 268 GJ ha −1 yr −1; palm shows the highest energy return on investment with a ratio of approximately 30:1. For carbohydrates and protein production, cassava and soybean, respectively, emerged as the crops offering the greatest energy savings in the production of these functional foods.Keywords: EROI, starch, oil, fertilizer, fiber, energy balance requirements by Brazilian agriculture is important to an evaluation of its sustainability. Based on this view, this study aimed to evaluate the energy embodied in 23 crops and assess how much energy is used in their production as well as the energy return, in order to direct subsidies in accordance with an environmental friendly and energy-saving policy that will secure the food supply in Brazil. Materials and MethodsEnergy flows of the following 23 crops were assessed: maize; wheat, cassava, potato, rice, bean, soybean (produced in two Brazilian regions: system 1 in the state of Paraná and system 2 in the state of Mato Grosso), peanut, sunflower, castor bean (comparing two systems, system 1 using low-level technology and system 2 a higher level of machinery and technology; and a third group comprising palm, lettuce, banana, onion, carrot, cucumber, bell pepper, tomato, cotton, eucalyptus, citrus, coffee and sugarcane. For this group, three scenarios of energy output flow (EOF) were developed: the first considering the production of juice only, the second juice plus bagasse, and third juice, bagasse and straw as output.From the utilisation point of view, there are basically two types of material flow: i) inputs applied directly, such as limestone, fertilizers, seeds and other chemicals used that carry with them amounts of energy for the production process and are currently in use in the fields; and ii) inputs applied indirec...

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“…Nesse processo, todas as entradas e saídas são quantificadas em fluxos de energia. Com a quantificação dessas entradas e saídas calculam-se indicadores que permitem avaliar e monitorar a eficiência do uso de fontes de energia não renováveis e a sustentabilidade do sistema agrícola (BUENO; CAMPOS; CAMPOS, 2000;HETZ et al, 1994, SIQUEIRA;GAMERO;BOLLER, 1999;REICHARDT, 2010;MILAN, 2010a). Entre os indicadores se encontra a energia incorporada (EI), que segundo Patterson (1996) e Stolarski et al (2014) definem como a relação entre o uso total da energia e sua massa por área produtiva.…”

Section: Sustentabilidade Da Aplicação Em Taxa Variávelunclassified

Viabilidade energética e econômica da aplicação de fertilizantes em taxa variável

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Energy performance of a production system of eucalyptus

Cited by 21 publications

References 19 publications

Energy-Based Evaluations on Eucalyptus Biomass Production

Energy-Based Evaluations on Eucalyptus Biomass Production

Energy embodiment in Brazilian agriculture: an overview of 23 crops

Viabilidade energética e econômica da aplicação de fertilizantes em taxa variável

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