Determinación de la evapotranspiración mediante imágenes áreas en bandas del espectro visible e infrarrojo cercano para cultivos de papa solanum spp.

Abstract

The methodology called “two step” is used to determine crop evapotranspiration (ETc), it is to multiply the reference evapotranspiration (ETo) by the crop coefficient (Kc). The operational methodology called “Kc-NDVI” (normalized difference vegetation index) is based on the linear relationship between Kc basal and NDVI for get maps Kc using the spectral response of vegetation cover represented in NDVI by satellite imagery. In this paper the ETc was determined of potato growing of Solanum spp, located in the city of Riobamba – Ecuador. The Kc was obtained by “Kc NDVI” methodology with the use of aerial imagery in the visible spectrum and near infrared. The ETo was determined by the method of evapo tank of type A. To validate was compared the resulting value with the ETc determined at ground level through “FAO Penman Montheith method” for ETo and tabulated data Kc. Similar behavior was observed between the results of both procedures, In addition to an agreement with phenological information from crop. We conclude that methodology used describes adequately the phenomenon of ETc from aerial imagery responding appropeiately to changes in crop development cycles so that recommended for use both in this plant species and other species in subsequent studies.