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Articles by G.U. Nnaji
Total Records ( 2 ) for G.U. Nnaji
  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.
  K. Okunomo , E.C. Orji and G.U. Nnaji
  A study on the effect of species density of Dacryodes edulis (G. Don) on maize performance was carried out at the teaching and Research Farm of Delta State University, Asaba Campus. Seedlings of D. edulis initially raised in the nursery were planted out in various inter hedgerow treatments as follows: (i) 4 m interrow x 0.5 m intrarow (ii) 4 m interrow x 1.0 m (interarow) and (iii) 4 m interrow and 1.5 m intrarow and (iv) Control treatment (without hedgerows). The parameters assessed were maize heights, collar diameter, leaf, number leaf area, cobs/stem and size per cob and grain yield. The result showed an insignificant difference in maize yield in the first year. The maize yield values recorded range from 2.908 t ha 1 to 3.124 t ha 1 in the first year. The grain yield in the second year was significantly better in the hedgerow treatments than the control. The results of other parameters assessed followed the same trend. It was however observed that maize productivity was negligible due to the inability of this species to fix nitrogen.
 
 
 
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