ABSTRACT
Soil salinization/alkalinization is one of the major factors affecting biomass production. In general, human-induced factors and unfavorable natural conditions are considered to cause and accelerate soil salinity. The salt-affected soils are found worldwide including Africa, Asia, Australia, Europe, Latin America, Near East, and North America. The incidence of salinization and/or alkalization manifests both in soils and plants. The performance of some crops that can be grown on saline soils, such as alfalfa, barley, and cotton, reflects the severity of soil salinity. Spectroscope/spectro radiometers are used for generating laboratory spectra which are used for identification of substances through the spectrum emitted from or absorbed in them and also for interpretation/analysis of air/spaceborne spectral data. Spectral measurements, thus made, are interpreted/analyzed using visual interpretation or computer-aided image analysis techniques to derive information on natural resources and environment including salt-affected soils. The delineation of salt-affected soils from aerial photographs interpretation begins with the delineation of physiographic/landform features and grey tones/colors.
