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Articles by S.O. Akparobi
Total Records ( 3 ) for S.O. Akparobi
  O.M. Agbogidi , S.O. Akparobi and P.G. Eruotor
  A study was carried out during the 2003 and 2004 cropping seasons to investigate the effects of crude oil contaminated soil on the yield of seven maize varieties (Composite suwan 1, Hybrid 3x-yx, AMATZBR w, TZBRSYN w, AMATZBR y, TZBRSYN y and Ozoro local) in two locations (Asaba and Ozoro) in Delta State, Nigeria. Five crude oil concentrations (0.0, 5.2, 10.4, 20.8, and 41.6 mL per maize stand) applied to soil at seven weeks after planting (7 WAP) constituted treatments. The experiment was laid out in a split-split-plot arrangement and replicated four times. Locations of study were allotted the main plots, the crude oil levels, the sub-plots and the maize varieties, the sub-sub-plots. The results indicated that both the fresh grain yields and dry grain yields of the maize across locations and within locations were not significantly affected (p = 0.05) by crude oil application to soil up to 5.2 mL but higher levels of the oil contamination significantly (p = 0.05) reduced these characters. The Hybrid (3x-yx) variety had the highest fresh and dry grain yields across and within locations hence it should be recommended for planting in Asaba and Ozoro locations of Delta State. Ozoro local had the lowest grain yields among the varieties tested. This study has shown that crude oil contaminated soil has a highly significant effect of reducing the yields of maize. The present study also established varietal differences in maize with response to crude oil thereby providing a basis for future study by plant breeders.
  O.M. Agbogidi , P.G. Eruotor , S.O. Akparobi and G.U. Nnaji
  This study evaluated the effects of crude oil contaminated soil on the mineral nutrient elements of maize. The study was conducted in Asaba and Ozoro locations of Delta State during the 2003 and 2004 planting seasons. Open pollinated AMATZBR y maize variety was used for the study. The experiment was laid out in a split-plot design replicated four times. Five crude oil concentrations (0, 5.2, 10.4, 20.8 and 41.6 mL) applied (ring application) at five weeks after planting (5 WAP) constituted treatments. The study location formed the main plot and the oil levels, the sub-plots. Grains were harvested at 14 WAP, shelled and analysed for mineral nutrient contents. Soil chemical properties were also analysed. The results showed that while total carbon, organic carbon, C/N ratio, phosphorus, calcium, magnesium and pH were significantly higher (p<0.05) in soils amended with crude oil, crude oil application to soil significantly reduced (p<0.05) electrical conductivity, total nitrogen and nitrate nitrogen in both locations. The highest values of 23.49 and 16.67 were recorded for C/N ratio in soils with 41.6 mL of oil while the lowest values of 8.83 and 9.72 were obtained in soils without oil treatment in Asaba and Ozoro locations, respectively. Significant differences (p = 0.05) were observed in the nutrient contents of maize seeds grown in soils amended with crude oil when compared with those grown in the uncontaminated sub-plots. The present study has demonstrated that crude oil contamination can improve soil content of some nutrient elements including Mg2+, K+, P, Na+ and exhibit a highly significant effect of reducing the chemical composition of maize seeds.
  O.M. Agbogidi , P.G. Eruotor and S.O. Akparobi
  Field experiments were conducted at the Delta State University, Asaba Campus Teaching and Research Farm and at Delta State Polytechnic, Ozoro during the 2003 and 2004 cropping seasons to evaluate the effects of time of application of crude oil to soil on the growth of seven maize varieties viz., composite suwam 1, Hybrid 3x-yx, AMATZBR w, TZBRSYN w, AMATZBR y, TZBRSYN y and Ozoro local. 0, 5.2, 10.4, 20.8 and 41.6 mL of the oil per stand of maize served as the treatments. The experiment was laid out in a split-split-plot design with four replications. Results obtained showed that soil treatment with crude oil at four Weeks after Planting (4 WAP) died within 24 h while the plants without crude oil treatment remained intact. At 6 WAP, only the maize varieties subjected to 41.6 mL of the oil withered while composite (suwan 1), Hybrid 3x-yx and the Ozoro local withered and died on exposure to 20.8 mL of the oil. No significant differences (p≥0.05) were observed in the plants height, leaf area and stem diameter of the maize varieties tested at 8 WAP. This study has shown that the time of application of crude oil to soil has a significant effect on the growth of maize.
 
 
 
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