Abstract:RESUMO:O balanço energético permite identificar as possíveis entradas e saídas de energia no processo de produção, resultando no saldo energético final do processo produtivo. O objetivo do presente trabalho foi avaliar os fluxos de energia de diferentes sistemas de cultivo para produção de milho na região de Lavras-MG. Foi realizado o estudo da eficiência energética e o balanço energético quantificando-se o coeficiente energético de cada componente envolvido no processo de produção e se determinaram as matrize… Show more
“…It was possible to observe a strong predominance of direct energy consumption (42,357.67 and 43,118.56MJ ha -1 ) in comparison to the indirect one (3,286.18 and 4,185.04MJ ha -1 ). Most of the authors that used a similar energy classification also reported a greater influence of direct energy in their energy matrix (ANGONESE et al, 2006;BIAGGIONI;BOVOLENTA, 2010;CUNHA et al, 2015;MARTINS et al, 2015).…”
Section: Resultsmentioning
confidence: 99%
“…According to the soil fertility analysis, the recommended dosage of NPK was smaller in the second harvest, which reduced the demand of fertilizers. Several authors that performed the energy balance of maize crop for grain and silage presented the fertilizers as the main input of energy consumption (CUNHA et al,2015;MARTINS et al,2015;VEIGA et al,2015;LIN et al,2016;FERRO et al,2017).…”
Section: Resultsmentioning
confidence: 99%
“…Conversely, the indirect energy is related to the manufacture of machinery, buildings and installations, irrigation systems and others correlated inputs. From then on, several authors have been using the same classification in their energy analysis (ANGONESE et al, 2006;BIAGGIONI;BOVOLENTA, 2010;CUNHA et al, 2015;MARTINS et al, 2015;FERRO et al, 2017).…”
Section: Introductionmentioning
confidence: 99%
“…There is a great interest in the energy analysis of the maize crop, both for grain and silage. Recent researches evaluates the capability of energy conversion of maize crop, impact of an energy input and crop management in the energy balance (RIQUETTI;BENEZ;SILVA, 2012;HOUSHYAR et al, 2012;MARTINS et al, 2015;CUNHA et al, 2015).…”
The aim of the present study is to evaluate the energy balance and energy efficiency of the silage maize crop in the Center for Research, Development and Technology Transfer of the Universidade Federal de Lavras (CDTT-UFLA). The crop was irrigated by center pivot and the stages of maize cultivation and energy inputs were monitored for the 1st and 2nd crops of the 2014/2015 harvest. Results from the energy analysis showed the crop had a total energy input of 45,643.85 MJ ha-1 and 47,303.60 MJ ha-1 for the 1st and 2nd crops and a significant predominance of direct energy type (about 92% of the matrix). Regarding direct energy inputs, the diesel oil was the most representative, contributing with approximately 38% of the total energy demand. Conversely, the irrigation system contribute with 3.92% e 5.97% in the 1st and 2nd crops, representing the largest indirect energy input. Nevertheless, irrigation and crop management allowed the system achieving high levels of productivity, resulting in an energy efficiency of 25.1 and 28.1 for the first and second crops respectively.
“…It was possible to observe a strong predominance of direct energy consumption (42,357.67 and 43,118.56MJ ha -1 ) in comparison to the indirect one (3,286.18 and 4,185.04MJ ha -1 ). Most of the authors that used a similar energy classification also reported a greater influence of direct energy in their energy matrix (ANGONESE et al, 2006;BIAGGIONI;BOVOLENTA, 2010;CUNHA et al, 2015;MARTINS et al, 2015).…”
Section: Resultsmentioning
confidence: 99%
“…According to the soil fertility analysis, the recommended dosage of NPK was smaller in the second harvest, which reduced the demand of fertilizers. Several authors that performed the energy balance of maize crop for grain and silage presented the fertilizers as the main input of energy consumption (CUNHA et al,2015;MARTINS et al,2015;VEIGA et al,2015;LIN et al,2016;FERRO et al,2017).…”
Section: Resultsmentioning
confidence: 99%
“…Conversely, the indirect energy is related to the manufacture of machinery, buildings and installations, irrigation systems and others correlated inputs. From then on, several authors have been using the same classification in their energy analysis (ANGONESE et al, 2006;BIAGGIONI;BOVOLENTA, 2010;CUNHA et al, 2015;MARTINS et al, 2015;FERRO et al, 2017).…”
Section: Introductionmentioning
confidence: 99%
“…There is a great interest in the energy analysis of the maize crop, both for grain and silage. Recent researches evaluates the capability of energy conversion of maize crop, impact of an energy input and crop management in the energy balance (RIQUETTI;BENEZ;SILVA, 2012;HOUSHYAR et al, 2012;MARTINS et al, 2015;CUNHA et al, 2015).…”
The aim of the present study is to evaluate the energy balance and energy efficiency of the silage maize crop in the Center for Research, Development and Technology Transfer of the Universidade Federal de Lavras (CDTT-UFLA). The crop was irrigated by center pivot and the stages of maize cultivation and energy inputs were monitored for the 1st and 2nd crops of the 2014/2015 harvest. Results from the energy analysis showed the crop had a total energy input of 45,643.85 MJ ha-1 and 47,303.60 MJ ha-1 for the 1st and 2nd crops and a significant predominance of direct energy type (about 92% of the matrix). Regarding direct energy inputs, the diesel oil was the most representative, contributing with approximately 38% of the total energy demand. Conversely, the irrigation system contribute with 3.92% e 5.97% in the 1st and 2nd crops, representing the largest indirect energy input. Nevertheless, irrigation and crop management allowed the system achieving high levels of productivity, resulting in an energy efficiency of 25.1 and 28.1 for the first and second crops respectively.
“…A eficiência energética foi obtida pela razão entre a quantidade de energia total de saída e o consumo total de energia durante Introduction Energy efficiency (EE) is the ratio between the total energy produced by a crop (MJ ha -1 ) and the fossil energy consumed in its production (MJ ha -1 ). Thus, the EE assessment of Brazilian agriculture aims to determine the bottlenecks of the cultivation systems adopted and to identify technologies and energy-saving inputs, especially those of fossil origin, such as fuel, fertilizer, agricultural pesticides, machinery and implements (CAMPOS; CAMPOS, 2004;CUNHA et al, 2015). The EE calculation is a tool for analyzing the economic and environmental sustainability of agricultural production systems.…”
The assessment of energy efficiency (EE) and greenhouse gas (GHG) emissions can highlight the sustainability of agro-systems and decision-making regarding reduction of production costs and environmental pollution. In this context, the objective of this work was to evaluate the EE and GHG emissions (CO 2 , CH 4 e N 2 O) of a soybean crop under organic cultivation in different regions of Brazil in the agricultural year 2014-2015. For this, 19 soybean areas were evaluated. The inputs and outputs of the agricultural operations and / or inputs used were calculated by multiplying the quantity used by their calorific value or energy coefficient at each stage of production. The energy efficiency was obtained by the ratio between the amount of total output energy and the total energy consumption during the production process. In order to estimate GHG emissions, the principles of the life cycle assessment methodology and recommendations of the Intergovernmental Panel on Climate Change (IPCC) were applied. For each 1.0 MJ of energy consumed in the organic production of soybeans, an average of 7.9 MJ of renewable energy was produced in the form of grains of this crop. The main energy costs of growing these organic crops were with seeds, fuel and with tractors, machines and agricultural implements (TMI). For each 1 kg of organic grain produced from soybeans, 0.19 kg of CO 2 eq are emitted during their production and delivery cycles in the warehouse. The main sources of CO 2 eq emission to the atmosphere were the seeds, fuels and organic fertilizers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.