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Summary. The analysis of vegetation lndexes dedved from the visible and infrared bands af the Advenied Very Hih Resolulan Radiometer (AVHRR) onboard NOAA satelliies, is a useful tool for monitoring density changes and crops health over an agriculturai cycle. Ths work io an example of the use of detection techniques in cultwated areas. The study 20"s belongs to the physiographical provinn, oi the Guanajuato state, known as Mesa Central, whkh possesses, in general, physical charaderistks such as homogeneous topography and saik and a well marked precipiiation season. Among the crops growing in these areas, the most outstanding are bean and rnaire which had during the 1996 seedinghawest perbd iheir most pradudwe cyde wuhin August - November. Field data such as temperature, daily precipkation and metearalogial informaiiin at diirent atmospheric heights were gathered likewise. Cun'iad and soik areas were digaired under ILWlS system emvironment. Addhionally, data on seed'rng time, types used and growing, reproductive and matunty periods were obtained. Resuls of the relation among the Normalized Diiference Vegetation index (NDVO values obtained from satell'ite images at dtferent dates and physical parameters such as precipitatan, climatic adversities and growing periad are presented.

Monitoreo del desarrollo de cultivos de temporal en la Mesa Central, Guanajuato, México, usando imágenes NOAA AVHRR