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Changes in land use induce alterations in soil properties over time. A study was conducted in Owerri North Local Government Area of Imo State, Southeast Nigeria to assess changes in aggregate stability, water retention characteristics, bulk density (BD), organic matter (OM) and acidity (pH) of soils from different land use types amended with organic materials. The experiment was a 3x3 factorial laid out in a completely randomized design replicated thrice. The factors were oil palm plantation (PP), rubber plantation (RP) and arable land (AL) as factor A, and poultry manure (PM), rice mill waste (RMW) and a control (CT) as factor B. Analysis of variance (ANOVA) was performed and F-LSD0.05 was used to compare the means. Rubber plantation (RP) recorded the highest mean weight diameter (MWD) in all treatments across land use, 3.00 mm in (CT), 4.93 mm in RMW, and 4.43 mm in PM) while AL recorded the lowest as observed in CT (1.60 mm), RMW (3.03 mm) and PM (2.53 mm). Arable land (AL) was most dispersed having clay dispersion index (CDI) of 53.90% (CT), 47.13% (RMW) and 45.77% (PM). Rice mill waste was better in reducing BD than PM and had the best reducing effect in AL (29.44%) than in PP (26.42%) and RP (11.11%). Field capacity (FC) increased by 15.24% when AL was amended with RMW and by 5.93% when amended with PM. Rice mill waste reduced acidity by increasing pH from 5.10 to 5.43 in PP, 5.40 to 5.66 in RP and 4.90 to 5.43 in AL. Organic matter (OM) was increased by 28.13%, 15.39% and 36.90% in PP, RP and AL, respectively, with application of RMW. The results indicated that the soil properties varied under the different land use types and they improved in response to the organic amendments. Therefore, the organic materials were effective in ameliorating the studied soils.
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