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Abstract
The main objective of this study was to spatially evaluate land suitability for surface irrigation in the Almanaqil Ridge, Gezira State, Sudan, on an area about 220.000 acers. The evaluation was based on FAO (1985) guidelines and the method proposed by Sys et al., 1991 (PART I, II, and III). Hundred check (auger) sites and 16 profiles were studied. The area was divided into 3 mapping units. The units are classified according to the American System (Keys to Soil Taxonomy, 2010) in the fallowing families: Fine loamy, mixed, isohyperthermic, TypicHaplustepts (unit1), Fine, mont, superactive, Isohyperthermic, VerticHaplocambids (unit2) and Fine, mont, superactive, isohyperthermic, TypicHaploustert (unit3). The 30 m spatial resolution Digital Elevation Model was used to generate slope by using Spatial Analyst Tool Surface Slope in ArcGIS 9.3 environment. Land characteristics used as criteria were slope class, texture, soil depth, calcium carbonate status, salinity & sodicity and drainage. The irrigation suitability map was compiled by matching between reclassified Land characteristics with irrigation land use requirements (LURs) using GIS tools. The results showed that units 2 and 3 are slightly suitable. This could be due to limitation of the clay texture (vertisolic) and drainage (low infiltration rate) while mapping unit 1 was suitable. The result can assist decision makers in ensuring that lands are used according to their suitability.
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References
2. FAO (1985), Guidelines: Land evaluation for irrigated agriculture (Soils Bulletin No. 55), Food and Agriculture Organisation of the United Nations, Rome.
3. Ibrahim,M.M.M (2013). Spatial Variability and Land Evaluation of the Soils of Almanaqil Ridge, Gezira State, Sudan (Thesis, PhD) submitted to University of Khartoum, Khartoum, Sudan.
4. Keys to Soil Taxonomy (2010).Soil Survey Staff.a basic system of soil classification for making and interpreting soil surveys, 11 edition. Agricultural Handbook 436, Natural Resources Conservation Service, USDA, Washington DC, USA, pp. 869.
5. Klute, A. (1986). Methods of Soil Analysis Part1: Physical and Mineralogical Methods (2nd edition) American Society of Agronomy, Inc., Soil Science Society of America, Inc., Madison, Wisconsin, UAS.
6. McRae, S.G. & Burnham, C.P. (1981).Land evaluation.Monogr.soil survey. Clarendon Press. Meteorology Office-Gezara (1994). Rainfall records 1922-1994.
7. Page, A. L.;Miller, R. H. and Ceaney, D. R. (1982). Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties, 2nd edition, American Society of Agronomy, Inc., Soil Science Society of America, Inc., Wisconsin, USA.
8. Sys, C. and Verheye, W. (1974). Land evaluation for irrigation of arid regions by use of the parameter method. Trans. 10th Int. Cong. Soil Sci. X: 149-155.
9. Sys, C., Van Ranst, E., Debaveye, J. & Beernaert, F. (1993). Land evaluation, Part 3: Crop requirements. Agricultural Publications 7. General Admin. Develop. Coop., Brussels.
10. Sys, I.C., Van Ranst, B. and Debaveye, J. (1991).Land evaluation.Part I. Principles in land evaluation and crop production calculations.International training center for post graduate soil scientists, University Ghent.
11. USBR Department of the Interior Bureau of Reclamation (1953). Irrigated land use, Part 2: Land classification. B. R. Manual. Vol. 5, U.S. Government Printing Office, Washington.