Dire Dawa Administrative Council Integrated Resource

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Water Works Design and Supervision Enterprise Figure 7 Soil Map Phase II- Data Collection - Site Investigation Survey & Analysis – DDAC - Main Report 27
Water Works Design and Supervision Enterprise c) All the soils have high to very high CEC values, which indicated that where topography allows, they are good agricultural soil with potential to hold plant nutrients. d) All most all soils have high base saturation percentage, which shows that they can be fertile not withstand high PH value. e) All the soils are strongly to extremely calcareous f) Exchangeable cation level are as follows for all soils. i) Ex. Ca level are high to very high ii) Ex. Mg levels are medium to high iii) Ex. Na levels are low to very low for most soils but some soils such as the Solonetz, Vertisols and few Fluvisols have medium to high levels. iv) Ex. K levels are for all soils g) All nutrient levels (Nitrogen and availability of phosphorus) are low for all soils, hence fertilizer response is expected. h) Organic carbon levels are also very low for all soils. a) Soil Degradation Soil and water conservation practices in most areas of Dire Dawa Administrative Council is not significant when compared with the area requires treatments and observed imprint of soil erosion. Furthermore, it was found that the quality of the existing soil and water conservation measures is not to a satisfactory standard and the effectiveness in terms of reducing soil loss and runoff is inadequate. Stone terrace, soil bunds and contour strips are practiced on farm lands. Stone terrace on bare mountains have not cope up with the severity of erosion and mass slides. Values for the erosion control practice factor are obtained from tables of the ratio of soil loss where the practice is applied to the soil. With no erosion control practice, P= 1.0. Soil Loss estimation made for DDAC using USLE. Table 7 Soil loss estimate for DDAC PHYSIOGRAPHIC UNITS MAJOR SOIL TYPE MAJOR LAND USE /COVER Phase II- Data Collection - Site Investigation Survey & Analysis – DDAC - Main Report ANNUAL SOIL LOSS ( TONS/HA) Undulating Plains & pediments Cambisols Bush & shrub land 3.62 Escarpments and terrace Regosols Cultivation 3.67 Hills & mountains Leptosols Bare land 12.3 Steep Mountains & peaks Leptosols Bare land 32.94 28
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Dire Dawa Administrative Council Integrated Resource

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