الفهرس 
ABSTRACT
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Abstract
The current study was carried out on a part of wadi El-Assiuti soils, eastern desert, at the east of Assiut city. The study area lies between latitudes 27° 10’ and 27° 45’ N, and longitudes 31° 18’ and 31° 48’ E. The study aimed to conduct a semi-detailed soil survey for the soils of the study area using Remote Sensing (RS) and Geographic Information Systems (GIS), investigate the physical and chemical properties as well as the nutrients status of these soils, determine the most limiting factors that retard and delay the productivity, and achieve a land capability evaluation of wadi El-Assiuti soils using ”ILWIS-GIS”. A visual interpretation was first undertaken on an enhanced natural color composite landsat TM image and overlaid on the Digital Elevation Model (DEM) for preparing the geopedological soil map using the 3D GIS capabilities. from the geomorphological point of view, the area under investigation was characterized by three main landscapes, i.e., plateau, piedmont and valley (wadi), which were recognized into six relief units, eight landforms and eleven soil mapping units. The mapping units (Pu 111, Pu 121, Pu 211, Pi 111, Pi 112, Pi 113, Va 111, Va 121, Va 221, Va 311 and Va 312) of the study area were strictly verified in the field where nineteen soil profiles were selected and dug to represent these mapping units. In addition, mini-pits and testing augers samples were intensively made. The soil profiles were carefully described and representative soil samples were taken from different layers of each profile. Then, the main physical and chemical characteristics of the different mapping units were determined and stored into ”ILWIS-GIS” database. According to the US Soil Taxonomy (Soil Survey Staff, 2014a), the soils of the study area were classified up to the sub group level as Typic Haplocalcids and Typic Haplosalids.
California storie index (Storie, 1978 and O’Geen et al., 2008) was used to rate the soil capability for intensive irrigated agriculture. The results were displayed as maps using ”ILWIS”-GIS.
The Integrated Land and Water Information System (ILWIS), as a data processing environment, has been intensively used in all the processing steps of the present study as well as all its vector or raster facilities, overlaying, crossing, map calculations and classifying purposes were used for making final maps. The obtained data of USDA capability classification system were created on ILWIS-GIS to prepare land capability maps.
Various information and data obtained from the present study could be summarized in the following:
A- Physical and Chemical Properties
The soils understudy were found to show wide variations in the physical and chemical properties that can be summarized in the following:
1- The morphological features as well as the obtained data of physical and chemical properties indicate that these soils are young and were formed mainly from gravelly, sandy calcareous soils. The studied soils were mostly coarse in texture (mainly sand, loamy sand and sandy loam). Soil texture was coarser towards the east where eolian sand dominated. Coarse mineral particles (sand) were common in the soil profiles that were located in the eastern part at wadi El-Assiuti and represented more than