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Erodibility of soils formed on a catenary toposequence in south eastern nigeria as evaluated by different indexes

, : Erodibility of soils formed on a catenary toposequence in south eastern nigeria as evaluated by different indexes. East African Agricultural & Forestry Journal 52(2): 74-80

The relative erodibility of 36 soil samples representing three soils formed on a catenary toposequence in a watershed in Nsukka, Nigeria, was compared using 8 different indexes. The results showed that the Wischmeier et al (1971) soil erodibility factor (K), the clay ratio (CR), dispersion ratio (DR) and the detachability index (DI) determined using the raindrop technique significantly (p .ltoreq. 0.05) correlated with soil loss determined by a rainfall simulator. The aggregated silt-plus-clay (ASC) index negatively correlated with rainfall-simulated soil loss. The indexes that utilize soil moisture holding capacities for their computations, the colloid content moisture equivalent (CME) ratio, erosion ratio (ER), and erosion index (EI), showed low non-significant (p > 0.05) correlations with soil loss indicating that the water holding capacities of these soils have no direct bearing on their resistance to erosion. In terms of ease of computation and for routine analysis the order of choice of these indexes for estimation of soil loss on these soils is CR > DR > K > DI while the erodibility of the soils were of the order Nkpologu .gtoreq. Nsukka > Uvuru series.

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