Spectral remote sensing provide the possibility for early, efficient and non-destructive evaluation of plant responses to different stress factors of the environment. Vegetation has a unique spectral signature which enables it to be distinguished readily from other types of land cover in an optical/infrared part of the electromagnetic spectrum. The spectral responses of vegetation are governed primarily by scattering and absorption characteristics of the leaf internal structure and biochemical constituents, such as pigments, water, nitrogen, cellulose and lignin. Spectral remote sensing based on reflectance makes use of VIS (Visible spectrum), near infrared (NIR), and short-wave infrared (SWIR) sensors to form images of the earth's surface by detecting the solar radiation reflected from targets on the ground. Airborne, space-borne and hand-held technologies are commonly used to investigate the spectral responses of plants. In order to improve agricultural management, scientist are applying information technology (IT) and satellite-based technology (e.g. global positioning system, remote sensing etc.) to identify, analyze, monitor and manage the spatio-temporal variability of agronomic parameters such as water, nutrients, diseases etc., within crop fields. This aids in timely applications of the required amount of inputs to optimize profitability, sustainability with a minimal impact on the environment.