Browsing by Author "Alabi , K. O"

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    Assessment of land degradation status of three forest reserves under teak and gmelina plantation in South-West Nigeria
    (Journal of Agriculture and Ecosystem Management, 2021-12-12) Alabi , K. O; Tobore , A.O; B. A. Senjobi
    This study assessed the degradation status of the three forest reserves along a toposequence under exotics plantation of Gmelina arborea and Tectona grandis with the aim of evaluating the deterioration level of the soil productivity in respect to human disturbance. Surface samples at depths of 0 - 15 cm and 15 - 30 cm were collected and soil laboratory analysis carried out to determine the soil properties of each site. Direct approach method was used to assess soil degradation status of these soils. The direct approach method showed that the soils at the three locations, both under teak and Gmelina plantation were seriously degraded physically, chemically and biologically. Onigambari were more degraded physically, chemically and biologically than other two locations with higher degradation in the upper slope segment. The type and degree of degradation observed on the two land use types across the locations are major factors to be considered in determining the suitable approach to soil improvement for sustainable management and production of timbers and non-wood products in our plantations
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    Characterization and classification of soils of a toposequence at Osun sacred grove, Nigeria
    (Nigerian Journal of Soil Science, 2018-06-12) Senjobi , B. A; Alabi , K. O; Ajiboye , G.A; C.O., Adeofun
    Rational use of forest resources without accurate knowledge of land and soil properties is a primary concern in achieving any millennium goal on afforestation. Hence, the morphological, physical and chemical properties of soils of a toposequence over coarse-grained granite gneiss at Osun sacred grove, in Osun State, south-Western Nigeria were studied. Three profile pits were dug under each landuse types (Teak and Gmelina plantations), making six pits in the location. Most of the pedons clearly expressed Argillic Bt horizon. Soil texture ranged from sandy loam to sandy clay loam. Soil structures ranged between medium sub-angular blocky and single grained. Bulk density values ranged from 1.31 to 1.69 gcm-3 and soils under teak plantation are generally higher in coarser texture with high gravel contents. The soils are slightly acidic. The soils had high base saturation, low CEC, and clay content increases with depth, regular decrease in organic carbon with an increase in depth is also observed. The soils are classified according to the United State Department of Agriculture (USDA, 2014) Soil Taxonomy and Food and Agriculture Organization- World Reference Base (FAO – WRB, 2014) as Alfisols and Inceptisol and having Udic moisture regime, under teak plantation, pedon 1, 2 and 3 were classified as Typic Kandiudalfs (Lixisols) , Lithic Dystrudepts (Leptosols) andPlinthaquic Kandiudalfs while under Gmelina plantation pedon 4,5 were classified as Typic Hapludalfs (Lixisols), and 6 as Aquic Kandiudalfs (Gleyic Lixisols). At the soil series level pedon 1,4 and 5 were classified as Iwo series, pedon 2 as Ekiti series, pedon 3 as Apomu series while pedon 6 was classified as Oba series
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    Digital mapping of cultivated land in two Peri-urban areas of Ibadan, Nigeria
    (Nigerian Journal of Soil Science, 2020-05-04) Tobore, A. O; Alabi , K. O; Ogundiyi , T; Bamidele , P.
    The need to save time, money and enhance quality as well as precise soil survey information through improved methodologies calls for digital soil mapping: hence, this study was conducted to map the peri-urban soils of Ajibode and Lade in Ibadan metropolis with digital method. Detailed soil survey using grid method was employed to cover the entire representative area for the study. Observation points were taken at a 100-meter interval. Six profile pits were dug, each at the three predominant land types viz: upper, middle and valley bottom in both locations. Profile pits were described and sampled for physical and chemical analyses following standard methods. Soil samples were collected at 0 -15cm and 15 - 30cm and further subjected to geospatial techniques for maize and cassava soil suitability production. Soils in Ajibode were classified as Iwaji Balogun and Oba series and fitted into Quartz-udic psamment according to USDA (2010) soil taxonomy system but correlated as Fluvisols following (FAO/UNESCO 2006). At Lade, soils were classified as Iwo, Balogun and Matako series. Iwo and Balogun series fitted into Rhodic-ustalf according to USDA (2010) and fitted as Lixisol in FAO/UNESCO (2006), while Matako series fitted into Dystric-fluvaquent (USDA, 2010) but qualified as Fluvisol FAO/UNESCO, (2006). Soils in Ajibode varied between moderately to marginally suitable for maize and cassava. In contrast, at Lade, it varied between moderately to marginally suitable for cassava and non-suitable for maize production. Mapping of soil using geospatial method helps to increase the efficiency of soil mapping, and thus recommended for precision and sustainable agriculture