Browsing by Author "Olawepo, Gabriel Kehinde"

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    Copper pollution effects on growth and biomass yield of Nigerian vegetables
    (IKSAD Publishing House, 2023-05-21) Olawepo, Gabriel Kehinde; Salami, Olalekan Oluwatoyosi
    This study investigated the impact of copper pollution on the biomass and dry matter of two commonly consumed vegetables in Nigeria, Amaranthus hybridus (Efo tete) and Celosia argentea (Efo soko). The plants were grown in soil treated with different concentrations of copper (100 mg/kg, 200 mg/kg, and 400 mg/kg) and in unpolluted soil for comparison. The results showed that both vegetables absorbed copper from the soil, but the levels were within the permissible limit (5-100 mg/kg). Interestingly, the copper absorption did not affect the biomass or dry matter of the plants. These findings suggest that these vegetables are tolerant to copper pollution and could be cultivated in contaminated soils without affecting their nutritional value.
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    Effects of Vermicast and Cowdung on the Growth of Groundnut (Arachis hypogaea L.) and Soybean (Glycine max L.)
    (Faculty of Basic and Applied Sciences, Kebbi State University, Kebbi, Nigera, 2025-06-01) Olawepo, Gabriel Kehinde; Isah, J. O; Fatoba, P. O.; Salami, Olalekan Oluwatoyosi
    Two essential legumes with both nutritional and financial advantages are groundnut (Arachis hypogaea) and soybean (Glycine max). Because organic fertilizers like vermicast and cow dung improve soil fertility, nutrient availability, and microbial activity, they can increase their growth and production. By comparing the impacts of different organic manures on groundnut and soybean growth performance, this study seeks to increase crop yield and offer insights into sustainable agriculture methods. The effects of organic fertilizers on the growth performance and physiology of Arachis hypogaea and Glycine max were investigated. This study used cow dung, vermicast, and a combination of cow dung and vermicast at three different concentrations: 45 g, 90 g, and 135 g. The following quantitative characteristics were measured: plant height, leaf area, leaf length, leaf breadth, leaf number, and branch number. Both species' fresh and dry weights as well as their levels of carotenoid and chlorophyll were measured. Based on the observed quantitative characteristics, the study found that the effect of three organic fertilizer treatments on Glycine max growth increases with increasing fertilizer concentration. Of the three treatments, the application of 135 g was the most effective (69.50±41.72a), while 45 g was the lowest (0.96±0.30abc). Except for cow dung, where the 45 g (36.00±0.00a) had the highest effect on Arachis hypogaea growth performance and the 90 g treatment had the least, the same pattern was noted. Vermicast is the least effective, while the combination of cow dung and vermicast is the most successful for both Glycine max and Arachis hypogaea. The combination of vermicast and cow dung is more beneficial for Glycine max, although vermicast has the greatest effect on Arachis hypogaea's chlorophyll A and B, total chlorophyll, and carotene concentration. The most beneficial effect on the fresh (20.78±0.78a) and dry weight (4.16±0.16a) of both plant species was found in cow dung. Therefore, compared to vermicast, cow dung, and the mixture are typically more successful at promoting plant development.
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    Impact of Biochar and Cowdung on Growth and Chlorophyll Content of Cucumber (Cucumis sativus)
    (Faculty of Basic and Applied Sciences, Kebbi State University, Kebbi, Nigera, 2025-06-01) Salami, Olalekan Oluwatoyosi; Olawepo, Gabriel Kehinde; Opeloyeru, N. A.; Lawal, B. Y.; Fatoba, P. O.
    An experiment was conducted beside the central research laboratory of the University of Ilorin to study the effects of water hyacinth-derived biochar (WHB) and/or cow dung (CD) on the growth, yield, and chlorophyll content of Cucumis sativus. The treatment includes: 20 g WHB; 40 g WHB; 60 g WHB; 20 g CD; 40 g CD; 60 g CD; 10 g WHB+10 g CD; 20 g WHB+20 g CD; 30 g WHB+30 g CD. The treatments were laid out as a randomized complete block design with three replicates. Parameters assessed were plant height, leaf area, number of leaves, chlorophyll content (chlorophyll A, chlorophyll B, total chlorophyll, and carotenoids), fresh leaf weight, and dry leaf weight. Application of 60 g CD gave the highest leaf number (11.0 leaves/plants) and plant height (27.00 cm), and 40 g CD gave the highest leaf area (50.75 cm2). There is no significant difference among the treatments on the effects on chlorophyll content, but the highest value was recorded in 20 g CD (CHL A-1.31 mg/g; CHL B-0.84 mg/g; total CHL21.58 mg/g; carotenoids: 4.24 mg/g). However, 60 g WHB produced the highest fresh leaf and dry weight (35.94 g and 13.47 g). It was concluded that using CD only has a promising effect on the plant growth and leaf area of Cucumis sativus. At the same time, the co-application of WHB and CD shows little or no enhancement, especially at high dosages when compared with the control and other treatment groups. 60 g WHB shows a promising effect on the fresh and dry weight of the Cucumis sativus leaf.