Avaliação do ciclo de vida da produção de grãos (soja - plantio direto e convencional) no Oeste do Pará
Visualizar/ Abrir
Data
2017Autor
FERREIRA JUNIOR, Miércio Jorge Alves
Metadata
Mostrar registro completoResumo
The present study was conducted in three production units located in the west of Pará. In these properties, questionnaires were applied to collect primary data and, when necessary, were complemented with secondary data (Agrossanta, Agrotécnica and specialized literature). These data were used to determine CO2e emissions, economic and energy costs. Soil CO2 emissions were obtained through the use of a dynamic concentration chamber. These measures were taken throughout the soybean production cycle covering the years 2014 and 2015.The objective of this study was to evaluate the effects of conventional tillage and no-tillage on the parameters (CO2e and CO2 emissions of the soil, energy efficiency, economic costs) based on a complementary approach of two techniques (ACV and concentration chamber) at each stage of the soybean cultivation process, such as soil preparation, planting, cropping and harvesting. The results show by means of the energy balance that no-tillage in the crop cycle is more efficient with an estimated value of 2.25, above 2.0, an index defined as an efficient and sustainable activity standard. The stages that most contributed to the energy expenditure in the conventional preparation were soil preparation and planting. The results show, in general, that the stages that use the greatest amount of resources in the productive cycle are soil preparation and planting under the two types of management systems. Therefore, these processes require the attention of farmers in the more rational use of inputs in order to cause less impact. The present study also showed that through the combined approach of the LCA and concentration chamber, considering the environmental dimensions (CO2e and CO2 emissions of the soil), energy and economics that the no-tillage cropping system is more efficient revealing that soybeans can be produced in more sustainable alternative systems in order to reduce these negative impacts. In addition, it was possible to point out the most critical points based on the analyzed parameters of the soybean cycle in order to allow adjustments to be made aiming at the best performance of the soybean production. However, further research should be developed seeking to integrate numerous indicators related to agricultural activity in order to better understand the dynamics of agricultural practice and the associated environmental impacts.
Os arquivos de licença a seguir estão associados a este item: