Browsing by Author "Dada, O. A."

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    Period of Weed Control in Okra (Abelmoschus esculentus (L.) Moench) as Influenced by Varying Rates of Cattle Dung and Weeding Regimes.
    (Notulae Botanicae Horti AgrobotaniciCluj-Napoca, 2013) Dada, O. A.; Fayinminnu, O. O.
    Field trials were conducted during 2005 and 2006 planting seasons to investigate the influence of cattle dung and the critical period of weed interference on growth and yield components of okra [Abelmoschus esculentus (L). Moench]. The study was a factorial trial laid out in a split plot design and replicated three times. The main plot comprised of four levels of cattle dung and the sub plots were three regimes of weeding. The growth attributes viz; plant height, number of leaves, leaf area and dry matter production differed significantly due to different treatments. These attributes increased significantly owing to the application of cattle dung which leads to continuous availability of nutrients to the plants as well as appropriate timing of weeding which reduced the influence of weed interference on the okra. Yield and yield components were influenced significantly by the application of cattle dung and weeding regimes. The highest fresh fruit yield (102.93 t ha-1) was observed in plots that received 8 t ha-1cattle dung and weeded at 3 and 6 weeks after sowing. Application of 8 t ha-1 of cattle dung as well as weeding at 3 and 6 weeks after sowing significantly enhanced okra growth and fruit yield. However, plots with sub-optimal cattle dung rate and infested with weeds until harvest produced the least dry matter and fresh fruit yield.
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    Phytoremediation of Pb, Cd and As from Urban Solid Waste Compost Using Tithonia diversifolia (Hemnsl.) A. Gray and Ageratum conyzoides L.
    (Annals of West University of Timişoara, ser. Biology (Romania), 2012) Dada, O. A.; Fayinminnu, O. O.; Taiwo, T. O.
    Soil and water contaminated with heavy metals pose a major environmental and human health problem in Nigeria. This study was carried out to ascertain the presence of heavy metals in Urban Solid Waste Compost (USWC) and examined the potentials of Tithonia diversifolia and Ageratum conyzoides in remediating heavy metals constituents of USWC. The study was carried out in the crop garden of the Department of Crop Production, Olabisi Onabanjo University, College of Agricultural Sciences, Ayetoro. The trial was a completely randomized design with four replicates. The treatment was made of two plant species belonging to Compositae family and USWC obtained from three different dump site locations in Ayetoro and a control.Two seeds of the two plant species were sown in pots containing 20kg of USWC and grown for 12 weeks. Data were subjected to analysis of variance and means separated by LSD at p≤ 0.05. At the commencement of the trial, the concentration of Pb, Cd and As in the USWC from the three dumpsites averaged 15mg/kg, 0.53mg/kg and 0.15mg/kg respectively. Post trial analysis showed that Pb, Cd and As contents of the USWC was reduced by 97.99%, 75.90% and 11.69% respectively. Uptake of Pb (t α =0.05 = 0.36), Cd (t α =0.05 = 0.64), and As (t α =0.05 = 0.91) by the two plant species were not significantly (p<0.05) different. Partitioning of the pollutants was more in roots (Pb = 15.15 mg/kg, Cd = 0.57mg/kg and As = 0.13mg/kg) than shoots (Pb = 14. 89mg/kg, Cd = 0.49mg/kg and As = 0.15mg/kg). The implication of the results for the quality of arables produced at urban and peri-urban roadside gardens as well as human health and environmental problems are discussed.