Assessment Of Land Degradation Using Some Biohysical Indicators In El – Rawakeeb Development Project

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Eljack Tawr Naash, Mubarak
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University of Khartoum
This study was initiated to update information and data of El-Rawakeeb dry area and to assess land degradation using some biophysical indicators. Soil samples were collected by an augor and subjected to laboratory and statistical analysis; samples of water from a bore hole were also analyzed. Interpretation of physical, chemical and field information indicated the presence of land degradation. Results showed an increase in pH and SAR for the cultivated soil than uncultivated soil . Sand encroachment formulated sand dunes that expanded in the area of the scheme (length and height of 107m; 3.6m). The results showed that soil texture follow the order sand (66%), silt (14%), clay (20%) and the organic matter is low with overall standard deviation of 6.56 and variation of 39.7. The distribution of soluble cations and soluble anions, showed irregular pattern, although there were no clear differences among different sites and depths, magnesium, calcium and chloride were dominant in the soil of the area. The results also indicated that, the soil was not saline and the irrigation water is slightly saline; (EC< 4dS/ m) for the soil. This deterioration can be controlled if some modern land management system is applied and sand dune fixation ,wind break and shelter belt techniques are adopted .
83 Pages