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Articles by J.C. Obiefuna
Total Records ( 4 ) for J.C. Obiefuna
  C.I. Duruigbo , J.C. Obiefuna and E.U. Onweremadu
  This study was conducted to determine the effect of poultry manure rates on soil acidity at the Federal University of Technology Research Farm Owerri. The experiment was laid out in randomized complete block design with three replications. Four poultry manure rates namely: 0, 5, 10 and 15 t ha-1 were used in the study. The soil physical and chemical status before and after application of poultry manure were analyzed. The chemical compositions of the poultry manure was analyzed. All data collected was subjected to analysis of variance according to the General linear model in statistical analysis software (SAS). Results indicated that application of poultry manure at the rate of 15 t ha-1 significantly increased soil pH from 4.14±0.9 (control) to 5.80±0.23 (pH in water) and from 3.62±0.13 to 5.78±0.18 (pH in KCl), respectively. Poultry manure rate of 5 t ha-1 did not significantly increase soil pH.
  I.I. Ibeawuchi , J.C. Obiefuna and M.C. Ofoh
  The effects of various row spacing on the yield and yield components of okra with groundnut were conducted at the training and research farm of the Federal University of Technology, Owerri. Yield and yield components of the crops in the various row spacing, monetary value of fresh okra fruits and dry groundnut pods were determined. The efficacy of the inter-cropping on weed suppression was evaluated. Okra plant height showed that R30 (30x50 cm) was highly significant than the other treatments in the experiment. Treatment R90 (90x50 cm) and R75 (75x50 cm) had significantly higher number of branches (p=>0.05). The results show that productive nodes increased with increasing row spacing, R90 had 77%, while R75 and R60 had 69 and 66%, respectively. This actually affected crop yield. However, R75, R60 and R90 had the highest fruit yield and were significantly higher than R30 and R45 at p>0.05. Conversely, R30 and R45 suppressed weeds better but had low fruit yield compared to R75, R60 and R9d . The yield of groundnut showed that R60 and R75 had the highest yield although it was not significantly different from R90. Treatment R75 had the highest monetary yield of N 132,200.00 ha-1 than the other treatments compared.
  E.U. Onweremadu , E.T. Eshett , M.C. Ofoh , M.I. Nwufo and J.C. Obiefuna
  We investigated the effects of Bulk Density (BD) and moisture content θv on seedling performance on a Typic Topaquept at Iyienyi Ibeku, Abia State, Southeastern Nigeria in 2005/2006 study session. A transect technique aided field soil sampling at identified physiographic units of Crest, Midslope and Footslope. A 7x7 factorial greenhouse experiment was conducted to create a matrix of BD and θv which enabled better understanding of compaction effects on seedling growth of Citrus sinensis Var Etinan. Data were subjected to statistical analysis using SAS computer software. Results showed that BD and soil strength decreased with mean root length density. Again, BD had significant (p< 0.0001) negative correlations with root performance. Moisture content had a significant positive correlation with root performance (R = 0.72; p< 0.0001). Soil moisture and BD were good predictors of root length density (R2 = 0.79) with high degree of accuracy (RMSE = 0.07) and slight over-estimation (Bias = + 0.0001): Mean root length density increased downslope and this was the trend in shoot yield. Fairly high values of coefficient of alienation, suggest the inclusion of other relevant variables in future modelling.
  I.I. Ibeawuchi , J.C. Obiefuna , M.C. Ofoh , G.O. Ihejirika , C.T. Tom , E.U. Onweremadu and C.C. Opara
  An evaluation of four soybean varieties namely TGX 1440-IE, TGX 1485-1D, TGX 1805-17F and Samsoy I, intercropped with Okra NHAE 47-4 was conducted in the ultisol of Owerri south eastern, Nigeria in 2001 and 2002 cropping seasons. Samsoy I, was significantly different (p<0.05) in height, number of branches and economic yield from other soybean varieties studied. Again Samsoy I and TGX 1485-ID were significantly different (p<0.05) from TGX 1440-IE and TGX 1805-17F in terms of total dry matter yield (TDMY) nodule weight (mg/plant) and nodule number, indicating a high potential for N-fixation in the Owerri ultisol. Okra showed no significant effect as it performed uniformly both in height, branching habit and economic yield. The highest economic yield (1.2 t ha-1) and monetary value (N78,500.00 ha-1) was obtained by intercropping Samsoy I+okra. The crop combinations were not effective in suppressing weeds, therefore care has to be taken to keep all plots weed-free.
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