Browsing by Author "Alabi, K. O."

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    Agronomic Evaluation of the Soils of a Toposequence for Rice (Oryza sativa L.) Production in Odeda LGA, Ogun State
    (Nigerian Journal of Soil and Tillage Research, 2018-05) Alabi, K. O.; Ajiboye, G.A.; Okeleye, K.A.; Aiboni, V.U.
    A suitability evaluation of some soil used for rice production in Odeda LGA of Ogun State was carried out. The result indicated that the identified soil types were currently marginally or unsuitable (N1) for rice production because of the index of current productivity IPc that ranged between 1.13 and 5.32. However the result further indicated that with improve agronomic and soil management technique, the suitability of these soil can be improved to S1 or S2 (highly suitable / moderately suitable) .This experiment was carried out to determine the level of agronomic and soil improvement that will result in acceptable yield of rice on these soils. A 2×2×2 factorial trial was used to evaluate the performance of rice under different management and fertilizer regimes within each mapping unit for two seasons. The factor considered were two rice varieties (Ofada and NERICAI), two types of fertilizers (N: P: K 20:10:10 at 400kg/ha and cured poultry manure at 10t/ha) and two different management methods (traditional and improved agronomic methods). The performance of the rice varieties did not differ across the land suitability units but was significantly affected by management practices (P=0.05). Fertilizer application increased the yield of rice by 30% while the difference in yield resulting from improved traditional farming was 10%. Application of both mineral and organic fertilizers significantly [P<0.001] improved the growth and yield of rice with organic fertilizer having higher effects. In conclusion, the productive capacity of soils for rice production can be improved through the use of both organic and inorganic fertilizers.
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    Effect of Slope Positions on Properties of Soils of some Forest reserves in South-West Nigeria
    (Nigerian Journal of Soil Science, 2021-08-27) Alabi, K. O.
    Topography has an influence on soil erosion and consequently on the properties of soils. The effect of slope position on soil properties is of great importance in soil suitability assessment. This study assessed the effect of topographic position on the characteristics of soil of basement complex rocks derived soils under Teak (Tectona grandis) and Gmelina (Gmelina arborea) plantations in Osun sacred grove, Onigambari and Omo forest reserves situated within South-West Nigeria. Three soil profiles were dug in each landuse type, sited at the upper, middle and lower slope positions along a toposequence. Soil samples were collected according to their pedogenetic horizons and were analyzed using standard methods. Results showed variations in colour, depth of soil profile, soil structure, texture, drainage and soil consistence. The high sand content dominated the particle size fraction in all the soils formed from the three locations, and base saturation was rated very high with values >90% irrespective of the toposequence or slope position. The result of correlation analysis between slope position and content of N, P, K and CEC showed a significant relationship irrespective of locations with N(r = 0.019<0.05), P (r = 0.041<0.05), K(r = 0.033<0.05) and CEC(r =0.025< 0.05) respectively. Despite variation in soil properties as influenced by topography, the studied soils can sustain the current land use type. It was concluded that soils on different topographic positions should be managed differently
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    Saturated hydraulic conductivity and water-stable aggregates in some forest reserves of Southwestern Nigeria
    (Journal of Agriculture and Ecosystem Management, 2022-01-11) Alabi, K. O.
    A study was carried out along a toposequence in three forest reserves under Teak and Gmelina of Osun Grove, Onigambari, and Omo in south Western Nigeria to evaluate changes in saturated hydraulic conductivity (Ksat) and percent soil water-stable aggregates (WSA%). Three points: upper slope, middle slope, and lower slope were delineated and samples for soil analysis were collected from pedogenetic horizon using core samplers and auger. Samples were analyzed for soil properties like; Ksat and WSA (%) Data from the analysis were subjected to ANOVA using GenStat and means were separated using Duncan’s multiple range test at P <0.05. Results indicated that there were significant differences in the saturated hydraulic conductivity both under teak and Gmelina plantation along toposequence at Onigambari and Osun grove. But at area J4, upper slope subsurface soil under Gmelina plantation and lower slope surface soil were superior to other slope segments. Meanwhile, middle slope subsurface soil and upper slope surface soil under teak plantation were significantly different from other slope positions. The structural stability and erosion resistance of the soil in area J4 were higher than those of the soil in the Onigambari and Osun sacred grove.
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    Suitability Evaluation of a Typic Plinthustalf in Southern Guinea Savanna Zone of Nigeria, for the production of Quality Protein Maize (Zea mays L.)
    (Institute of Agricultural Research and Training (IAR&T) Obafemi Awolowo University, Nigeria., 2020) Alabi, K. O.; Wahab, A. A.; Lawal, O.O.; Uthman A. C. O.; Afe A.I.; Omodele T.
    The need to optimize and produce maize of quality protein content in a Typic plinthustalfs calls for potential suitability evaluation. Hence, three mapping units were established along the toposequence and three profile pits were dug at each per mapping unit. The pits were described and sampled following FAO guidelines. Soil samples were taken from the pedogenic horizons for morphological, physical and chemical data analyses. Linear parametric and square root models were used for assessing the suitability of the soils for maize production. Land qualities considered in the study were climate, topography, wetness, soil fertility and soil physical properties. Except for the fertility status of the land, other qualities were not a constraint to the production of maize at the study site. All the pedons were classified as currently not suitable by both linear and square root models with index of current productivity (IPc) ranging between 1.08 and 2.05. Potentially, using the linear model, the index of potential productivity (IPp) ranged between 63 and 90 thus rated pedon 1 and 2 as highly suitable and pedon 3 as moderately suitable while the square root model indicated all pedons as highly suitable, for both local and quality protein maize production. The limiting factors were mainly low levels of available macro-nutrients (N, P, K, Mg), low organic carbon (0.82 %), and low cation exchange capacity (< 16 cmol/Kg) in all three pedons studied. In conclusion, all the pedons were classified as Typic plinthustalfs were currently not suitable (N1) for Maize Production both by the linear and square root models. Hence, it is therefore recommended that good soil management practices such as integrated soil fertilizer application, effective tillage practices and cover cropping should be adopted to ensure sustainable land use for maize production at the studied site.