Godwin Umoren Akpan


Abstract: This study was conducted to characterize some inland depression soils in Southeastern Nigeria and recommend management option for sustainable crop production. Eight profile pits were sited at Ekpene Ukpa (Ek1), Nung Obong (NO3 and NO4), Ikot Obong (KS2), Ibiaku Ikot Obong (TU16), Ikot Eto (ND15), Awa Ntong (AU17) and Ikot Okobo (AU18) depressions. Results showed that soil texture ranged from sand through sandy loam to sandy clay loam. Soil reaction varied from very strongly to moderately acid (3.0 - 6.0) with pH value averaged 5.0 ± 0.4. Organic matter content was high in the surface soils (23.22 - 51.43gkg-1) while total N level was low (0.1 – 1.3gkg-1). Available P (4.26 - 253mgkg-1) ranged from low to very high. Cation exchange capacity (CEC) was low while percentage base saturation ranged from moderate to high (33 - 83%). The main constraints to sustainable crop production in these soils are low chemical fertility (moderate to high exchange acidity, low CEC, total N level, high percent Al saturation, 20 - 98%) and rapid weed growth. Slash and mulch system along with crop residues return and application of green leaf manures to the soil could affect several restorative processes in addition to suppressing weed growth. Mineral fertilizers, if available could have the desired effect on the soil by increasing biomass production for use as residue mulch and yield of crops.

Keywords: Inland wetlands, characteristics, soil management, crop production ,N



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