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Articles by S. Ogunyemi
Total Records ( 3 ) for S. Ogunyemi
  O.S. Olabode , S. Ogunyemi and G.O. Adesina
  Good weed management strategy is based on good understanding of the intricate interactions involved in weed-crop association. Based on this assertion, field experiments were conducted to study the interference effect of Tithonia diversifolia on melon. Ten treatments were investigated in a randomized complete block experiment (RCBD) with three replications. Result showed that Tithonia interference reduced melon growth significantly (p = 0.05) with increasing length of interference. Tithonia interference in melon for smore than 4 weeks after planting (WAP) was as bad as not weeding at all while interference free period of not more than 2 WAP was equally inadequate and produced plants that were as stunted as those not weeded at all. Melon seed yield was significantly better when exposed to a minimum of 4 WAP Tithonia interference free period or a maximum of 2 WAP Tithonia interference than other treatments (p = 0.05). Highest seed yield (2825 kg ha-1) was produced by melon plants exposed only 2 WAP interference. However plot with the highest yield was not statistically significant to yield from melon plot with at least 6 weeks of initial weed freeness and the control plot (240, 2646 and 2627 kg ha-1, respectively) and for weed free melon plots of 6 and 8 weeks, respectively. Onset of crop/weed interaction affected both the dry matter and plant density of Tithonia significantly (p = 0.05). These parameters decreased with increased delay in the onset of crop/weed interaction. The implication of these findings is discussed.
  K.S. Chukwuka , S. Ogunyemi and I. Fawole
  Ecological distribution of Tithonia diversifolia (Hemsl). A. Gray was studied in six states of the southwestern Nigeria using three locations in each of the States. The presence of T. diversifolia was recorded in all the States and locations surveyed in varying numbers with associated weeds. Survey data were analysed using detrended correspondence analysis (DCA). The first two ordination axes of the DCA accounted for 67.2% (Axis 1, 40.6%; Axis 2, 26.6%) of variance on the site and species components. The DCA separated Ogun State locations from others. T. diversifolia was found to be closely associated with Boerhavia coccinea, Fleurya ovaliflora, Indigofera subulata, Merremia dissecta, Mimosa pudica, Momordica foetida, Phyllanthus mimosoides, other species of Phyllanthus, Physalis angulata, Schrankia leptocarpa and Sesbania parchycarpa in Ekiti, Lagos, Ondo, Osun and Oyo States while these species were absent in Ogun State.
  K.S. Chukwuka , S. Ogunyemi , J.S.A. Osho , G.I. Atiri and J.I. Moughalu
  The effects of water, light and chemical fertilizer (NPK) on the growth and development of Tithonia diversifolia (Hemsl) A. Gray were investigated under nursery and field conditions. The number of leaves produced and biomass accumulation by T. diversifolia increased with the age of the plant from 55.0±6.4 at 6 weeks after planting (WAP) to 1352.0±39.8 leaves (14 WAP) and 4.5±0.2 g/plants (6 WAP) to 1259.4±19.1 g/plants (14 WAP), respectively. This trend was maintained under both optimum and stressed conditions of water, light and chemical fertilizer. Light was the next most important factor after water with respect to biomass accumulation of T. diversifolia. With minimum light intensity (500 lux), the biomass accumulation was 85.87plusmn;3.7 g/plants whereas without fertilizer application the biomass accumulation was 301.4±4.4 g/plant.
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