El GreenSeeker？ y el diagnóstico del estado de salud de los cultivos

greenseeker？and the diagnosis of crop health. the objective of this note is to provide basic information and technical principles needed for the use of the greenseeker？, in agricultural applications such as nitrogen fertilization, irrigation scheduling, mapping of agricultural fields and precision agriculture. a description of the instrument is provided, as well as the technical and physiological principles that support its use in agriculture. the radiative properties of plant canopies and light reflection from healthy and stressed crops are described briefly. possible applications of greenseeker in diagnosis and correction of crop disorders in the field in real time are considered, according to spatial heterogeneity ubiquitous in tropical agro ecosystems. the limitations of the technology currently available and its applications to other tropical crops, besides rice and corn, are also addressed.