YIELD ESTIMATE OF IRRIGATED COFFEE BY SPECTRAL AGRO ECOLOGICAL ZONE METHOD

Abstract

The notorious role of coffee in Brazilian economy justifies and motivates the realization of scientific researches that contribute to the improvement of the culture monitoring, refine the productivity estimation and offer political support for planning and commercialization. In this context, the present thesis aimed the monitoring and the productivity estimation of coffee plantations – located in the northwest of Minas Gerais – by means of an agrometeorological-spectral model. The spectral monitoring was done through the behavior of the EVI and NDVI vegetation indexes, fed by spectral data from MODIS sensor with the MOD13Q1 product. The original mathematical agrometeorologycal model is based on the penalization of cultivation potential productivity due to the hydric deficit between the culture potential evapotranspiration (ETc) and the real evapotranspiration (ET), adjusted by different sensibility culture coefficients (ky) for different fenological states. A value of r² was obtained by adjustment of the model parameters for the plantations and resulted between 0,79 and 0,95 and also a concordance index “d” Willmott between 0,93 and 0,95 for different pivots. The satisfactory results confirm the potential of the agrometeorological-spectral model application for estimation of productivity of plantations.