Modelagem agrometeorológica-espectral para estimativa da produtividade de cafeeiros para áreas irrigadas do noroeste de Minas Gerais

• Autor(a) principal: Almeida, Thomé Simpliciano
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1519
• topic: Café; Produtividade; Modelagem; Agrometeorologia; Noroeste de Minas Gerais; Coffee; Productivity; Modeling; Agrometeorology; Northwest Minas Gerais; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::AGROMETEOROLOGIA

The prominent position of coffee plantation in the Brazilian economy makes it important to conduct scientific research that contributes to the monitoring and estimation of crop productivity by providing subsidies for planning policies and agricultural marketing. In this sense, the present work aimed at monitoring and estimation of the yield of two coffee farms in the northwestern part of the state of Minas Gerais from the use of a spectro-agrometeorological model. The model monitoring was carried out with spectral behavior of the vegetation indices EVI and NDVI, provided by the spectral data with the MODIS product MOD13Q1. The mathematical model was based on agro meteorological penalty of potential crop yield due to water deficit, adjusted for different sensitivity coefficients in the various growing stages. The spectral input variable was the Leaf Area Index (LAI) estimated from the NDVI. Others inputs variables were meteorological observed data, irrigation and soil data obtained in two farms, with an actual observed coffee bean yield of those farms for the years of 2005/06 2006/07 2007/08 2008/09 2009/10, and 2010/11. The model parameters were adjusted based for the yield data provided by the Irriger®, for the years of 2005/06 and 2006/07. As a result, vegetation indices showed a good relationship with the phenological of coffee tree growing stages, with management practices such as pruning and irrigation and also to the rainfall occurrence. With the parameter settings for the model to each farm, the model showed that the coefficient of determination value ranged from 0.79 to 0.95, and Willmott agreement index "d" from 0.93 to 0.95, for different center pivots. The satisfactory results indicated the potential application of the spectro- agrometeorological model to estimate the productivity in coffee plantation farms.