Proximal sensing technology has been developed as a useful tool for rapid and economic predictions of many crop physiological and biochemical parameters.Over the past two decades,development of robust and widely applicable visible near-infrared(vis-NIR)diffuse reflectance spectroscopy(DRS)models with an acceptable level of accuracy is an ongoing task.Vegetation SPAD(Soil and Plant Analyzer Development)is one of the most important agronomic parameters(eg.chlorophyll content)for assessing vegetation growth st...