A number of reported studies involving the application of mathematical models with the GIS techniques were found in literature. Hamlett et al. Broten et al. Haan et al. Most of the soils cultivated for cotton production are distributed on broad plains and uplands, with a deep profile and a gentle slope.
Soil textures range from clay to fine sand.
The climate is continental and relatively dry. On average, about 24 in. of water was applied on the irrigated land through furrow irrigation system during the growing season. The detailed description was given by Sabbagh et al. The package is well-known in the GIS community and has been widely used by government agencies and universities. Both raster and vector data files can be incorporated for spatial analysis.