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Model for soybean production forecast based on prevailing physical conditions
Published: 01 February 2017 by FapUNIFESP (SciELO) in Pesquisa Agropecuária Brasileira
FapUNIFESP (SciELO), Volume 52; 10.1590/s0100-204x2017000200003
Abstract: The objective of this work was to evaluate the reliability of the physiological meaning of the enhanced vegetation index (EVI) data for the development of a remote sensing-based procedure to estimate soybean production prior to crop harvest. Time-series data from the moderate resolution imaging spectroradiometer (Modis) were applied to investigate the relationship between local yield fluctuations of soybean and the prevailing physically-driven conditions in the state of Mato Grosso, located in the south of the Brazilian Amazon. The developed methodology was based on the coupled model (CM). The CM provides production estimates for early January, using images from the maximum crop development period. Production estimates were validated at three different spatial scales: state, municipality, and local. At the state and municipality levels, the results obtained from the CM were compared with official agricultural statistics from Instituto Brasileiro de Geografia e Estatística and Companhia Nacional de Abastecimento, from 2001 to 2011. The coefficients of determination ranged from 0.91 to 0.98, with overall result of R 2 =0.96 (p≤0.01), indicating that the model adheres to official statistics. At the local level, spatially distributed data were compared with production data from 422 crop fields. The coefficient of determination (R 2 =0.87) confirmed the reliability of the EVI for its applicability on remote sensing-based models for soybean production forecast. Index terms: agriculture; EVI; Modis; remote sensing; satellite
Keywords: MODIS, Soybean Production, adheres, soja, Enhanced Vegetation Index, Remote sensing, crop fields, EVI, Prevailing Physical
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