Avaliação de índices de vegetação como alternativa para estimativa de rendimento de óleo de soja para produção de biocombustível em várzea no estado do Tocantins

Abstract

Studies on agroenergy cultures have been developed and implemented with the analysis of images of both unmanned aircraft, such as drones and vans and the use of orbital images, as an example of Landsat 08 satellite images made available by the Geological Survey of the States United States (USGS). In this context, the present study has the objective of estimating the oil content and yield of soybean oil in the Tocantins várzea region, in the municipality of Formoso do Araguaia - TO, using field sampling and images obtained from LANDSAT 08 satellite through vegetation indexes: SAVI, NDVI and IAF for the years 2016 and 2017 aiming at the production of biofuel in the region. The values pof planted area presented a difference between the indices with the significant results p <0.005 for the NDVI with R² 0,7523 and R equal to 0.8673 and good differentiation between the plots and the access areas for the IAF index. The productivity was estimated using the NDVI index and the yields obtained in the field correlated with significant results, p <0.005, with a values of R² 0.70 and R values equal to 0.84. The oil contents were estimated from field sampling with a value of R ² 0.89 and at the end presented results between 15 and 26%. The temperatures were obtained by means of the Landsat 08 images and estimated for the plots with planting in 2017 with R² value equal to 0,93. The yield of the oil was carried out in function of the estimated productivity and the values oil content for the fields of 2017 varying between 380 and 710 liters. It can be affirmed that the adopted methodology was successful in the estimation of oil yield and oil content, being able to contribute to future studies adding a greater variability of samples.