The Influence Of Geology And Other Soil Forming Factors In The Inherent Fertility Of Soils In The Assela Area Arssi Ethiopia

The geology of the Asela area has been studied In de t a ~ lrnand the fertility status of the soils in relation t o thernf actors of soil formation (parent material, climate, top ogrrnaphy , organisms and time) examined qualitatively and semiquantrnitatiVielyo The area is associated with Pliocene andrnyounger volcanics (central and fissur al) and is intensivelyrnaff e cted by different episodes of faultingo Basal t s, Trachybasaltsrn, trachytes and acidic pyroclastics are the rocksrnoc curing in the areao The major soils are the dark-dark brownrnand the reddish brown soils of the plate au and the dark-browndarkrnye llowish brown soils of the rifto In general, the rif trns oils have higher plant nutrient s t atus than the plateaurnsoil s o Removal of materials is important on the plate au andrnaddition in the rifto Parts of the plateau and mo s t of t hernr i f t f l oor are affected by poor drainageo The abundance ofrnsurf ace hindrances on the surface of the rift soils might bernattr i buted to t he young age of the rocks in the lattero Inrnte r ms of physical limit ations of the land, both t he lowlandrnand t he plateau have their drawbacks o The cumulative influencernof the topography and the climate is found to be dominantlyrnr e s p ons ible for the lateral and vertical variations of therninherent fe rtility of the soilso

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