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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9947

Authors: Al-Malik, A.S.
A. I. Al-Sheikh
Issue Date: 1997
Publisher: The First Saudi Symposium on Agricultural Sciences - King Saud University under the logo (The Saudi Agriculture between Expansion and Rationalization
Abstract: The northern part of Wadi Hanifa was selected for this study from the pedological point of view. It is located at about 70 Km west of Riyadh city with total area about 21339 ha. Soil moisture and temperature regimes were defined as torric and hyperthermic respectively. Under such climatic conditions, natural vegetations are scanty and increased particularly during the winter rainy season. Limestone rock was the main rock from which these soils were formed. Aerial photo interpretations for the studied area indicated the presence of the following geomorphic units: plateau, outwash plain, scarp, alluvial fans, wadis and mesas. Sixteen soil profiles were selected to represent the different geomorphic units. Soil profile descriptions and analytical data revealed that, the soils are mostly deep, light or medium texture, massive, very low in organic matter (0.01-1.01%), and highly calcareous (28 - 93% CaCO3). Gypsum contents are quite low except for the outwash plain unit which contains from 1.04 - 5.38 % gypsum. Generally, these soils are nonsaline to slightly saline (ECe ranges from 0.43-6.79 dS/m) except the soils of outwash plain (ECe ranges from 3.39-36.75 dS/m). The pH values show that the soils are slightly to moderately alkaline (pH ranges from 7.4-8.3). Results of available micronutrients show marginal level for Fe and deficiency for Zn, Mn and Cu. Soils of the studied area were classified according to soil taxonomy into the Entisol order then, suborder, great soil group, subgroup and family levels were differentiated for each profile. Land evaluation was carried out and the study area was differentiated in view of type, number and degree of agriculture limitations. The limitations are mainly the effective root zone, depth of bedrock, amount of gravels, nutrient availability, relief, workability of land, available water, and calcium carbonate content. According to FAO system, soils of the studied area could be differentiated on the class level to the following; moderately suitable (633 ha), marginally suitable (3900 ha), currently not suitable (806 ha) and permanently not suitable(16000 ha).
URI: http://hdl.handle.net/123456789/9947
Appears in Collections:College of Foods And Agricultural Science

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