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In this study, physico-chemical properties of 2 differentially located grassland soils which were subjected to different economic usages, were assessed. The study was carried out for grassland soils of Ogbole-Ogume (excavation) and Abbi (Cultivation), both in Ndokwa West LGA of Delta State, Nigeria. The soils were collected at the road margin (0m), 30m into the grasslands and 10m away from the end of the grasslands at a depth of about 10.30m each from the soil surfaces. Soil characteristics as pH, Mg, Ca, Na, K, EC, CEC, SO₄, P, N, clay, silt and sand contents were analyzed following standard procedures and methodologies. At margins, soils from Ogbole-Ogume and Abbi contained 94.5% and 91.0% sand; at 30m into the grasslands, both were 93.0% sand while at 10m beyond the grassland soils, 93.0% and 90.0% sand were recorded for Ogbole-Ogume and Abbi, respectively. Comparatively, physico-chemical parameters investigated in this study showed variations between both sampled sites as parameters like pH, Mg, Ca, K, CEC, P and N were generally higher in Abbi than in Ogbole-Ogume grassland soils. This clearly indicated that crop cultivation at Abbi grassland soils must have significantly impacted more on the physico-chemical properties of the soils than excavation activities as practiced at Ogbole-Ogume grassland soils. This has strong indications for food security and environmental health.

Comparative Assessment of Physico-chemical Characteristics of Two Grassland Soils Subjected to Different Uses in Delta State, Nigeria