Variabilidade espacial e temporal do índice NDVI em vinhedo da cultivar Isabel precose e sua utilização Variabilidade espacial e temporal do índice NDVI em vinhedo da cultivar Isabel precose ecomo preditor de produtividade

Abstract

Viticulture plays a very important socioeconomic role in the Northeast, where it has contributed to supplying the domestic market. Multispectral sensors are used in agriculture to assess the spatial variability of crops. However, studies using these tools are scarce. The objective of this work was to analyze the Normalized Difference Vegetation Index (NDVI) of the grape crop, from the images obtained by an unmanned aerial vehicle (UAV) and correlate it to productivity. An UAV Phantom 4 was used, with a RedEdge-M multispectral camera with five optical sensors of radiometric resolution, which captured images in the spectral bands BLUE (475 nm), GREEN (560 nm), RED (668 nm), RED EDGE (717 nm) and NIR (840 nm). The NDVI evaluation was carried out in four different phenological stages, and presented variations with increasing values, with the highest NDVI in the E-L35 phase. The NDVI in the E-09 phase showed a moderately significant correlation with leaf phosphorus content and Soluble Solids content, while the NDVI in the E-L35 phase showed a moderately significant correlation with productivity. Keywords: remote sensing; drone; grape.