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Articles by O.J. Omoju
Total Records ( 2 ) for O.J. Omoju
  J.K. Adesodun , F.A. Olowokere , A.A. Soretire , C.O. Adejuyigbe , A.O. Adewole , P.O. Akintokun and O.J. Omoju
  This study investigated the residual effects of Tithonia diversifolia (wild Mexican Sunflower) incorporated as green manure and also composted with poultry manure and other organic-based and inorganic fertilizers on C-N storage and structural stability (SI) of a loamy sand soil in South-western Nigeria. Treatments applied include fresh Tithonia diversifolia (GM), Poultry Manure (PM), Tithonia diversifolia composted with PM (CP), Organo-Mineral Fertilizers (OMF), Neem fertilizer (NF), NPK (20-10-10) and control (C) while soil samples were collected at different depths (0-15, 15-30 and 30-45 cm). Results show that OC were stored most in OMF plots while total nitrogen was occluded most by green manure. The overall trend was OMF>PM>GM>CP>C>NF>NPK irrespective of sampling depth. The SI varied between 11.59-18.63% at 0-15 cm soil depth, 4.26-9.13% at 15-30 cm depth and 4.39-9.19% at 30-45 cm depth, while highest SI values were obtained in plots amended with only PM. The SI values for the surface soils were >9% considered to indicate sufficient accumulation of soil carbon to maintain structural stability. In conclusion, Tithonia diversifolia when incorporated fresh into soil or applied as compost and OMF are good sources of amendments to improve soil quality than inorganic fertilizers alone.
  A.S. Fasina , A. Raji , G.A. Oluwatosin , O.J. Omoju and D.A. Oluwadare
  Soils derived from some parent materials in South-Western Nigeria covering 219,580 ha of land were mapped at a scale of 1:50,000 using a combination of conventional and remote sensing methods of soil survey. The aim is to generate detailed information on the properties, genesis and land characteristics of these soils for their sustainable use and management. Seven soil series were identified and classified (Kulfo series, Typic Paleudalf; Ibeshe series, Typic Rhodudalf; Idesan Series, Fluventic Eutrudept; Iweke Series, Typic Udipsamment; Alagba Series, Typic Haphudalf; Ondo Series, Typic Ferrudalf and Fago Series, Typic Plinthudult). Soils of Ondo and Fagbo series contain a lot of iron manganese concretions, quartz stones and gravels. The soils are very strongly acidic (4.50) to moderately acidic (5.70). The soils have moderately low inherent natural fertility with low exchange basic cations (Ca, Mg, K, Na), organic carbon, cation exchange capacity, total nitrogen but moderate to high micro-nutrients (Cu, Fe, Mn and Zn). Soils of the sedimentary origin (Alagba, Iweke, Idesan, Kulfo and Ibeshe) were observed to be more fertile and more variable in soil properties than those derived from the basement complex (Ondo and Fagbo series). Dominant pedogenic processes which influence the rate of soil development within the study area include hydrolytic weathering, lessivation, plinthization, pedoturbation, braunification, induration, leaching, erosion and colluvial deposition. The soils were classified into land capability classes. Only four (I, II, III and IV) out of the eight capability classes were encountered. Recommendations for sustainable use and management of these soils are discussed.
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