Browsing by Author "Liasu, M. O."

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Allelopathic effect of Chromolaena odorata (L) (R.M. King and Robinson) extracts on the growth and development of Celosia argentea
(2012) Ogundola, A. F.; Liasu, M. O.; Fayinminnu, O. O.; Adelasoye, K. A.
Plant species avoiding or excluding other plants species from growing in its environment is likely to contain allelopathic substances that are responsible for the reaction. Codorata has been observed to possess allelopathic characteristics. Therefore, the allelopathic potentials of chemical substances present in C. odorata was assessed on the growth performances of Celosia argentea in a pot experiment. Plant extracts from Chromolaena odorata were analysed to determine the active chemical ingredients. Results of physico- chemical analyses of the soil indicated that it was moderately suitable for agricultural purpose, as all the nutrients needed for proper performance were contained in the soil such as %Nitrogen (20.55), %Organic carbon(18,60), Organic matter content (28.40). P(μg/g-5.68), pH(6.86) K (mg/100g 1.20), Ca (mg/100g 25.90), Mg(mg/100g-3.16).Na(mg/100g-1.20), Cu(mg/100g-0.64), and Mn(mg/100g-0.05). Chromolaena extracts contained Saponins, tannins, alkaloids, flavonoids and terpenoids as active chemical ingredients. Tanins has the highest mean concentration of 52.6mg/100g of the extract while flavonoids recorded the lowest mean concentration of 15.33mg/100g in the leaves. There is significant difference at p= 0.05 in the growth performance of Celosia in control and experiments. The results are t a 0.05 2.8, 3.0, 1.8, 2.7 and 2.3 for the plant height, stem diameter, mid-rib, number of leaves, and number of branches respectively. Chromolaena extracts boost the performance of Celosia argentea, instead of affecting the growth and performance negatively.
Loss of Biodiversity Through Different Sources of Pollution.
(University of Ibadan, 2010) Ogundola, A. F.; Atayese, A.; Ajao, O. S.; Ishola, O. A.; Fayinminu, O. O.; Liasu, M. O.; Ogunkunle, A. T. J
A major source of loss of plant biodiversity has been traced to anthropogenic factors, in which pollution is an important aspect. This necessitates establishment of facts on different polluted sites in Oyo, and Osun States in order to prevent the occurrence that further leads to loss of biodiversity of the affected ecosystems. Descriptive research was carried out to assess the level of distortion done to the former stabilized environments. This was aimed to assessing the floral composition of two different spent oil and fertilizer polluted ecosystems using quadrat method of sampling. Relative densities, frequencies and Importance value of each plant in the study sites were carefully calculated. The results informed that: the floral composition of the oil spent polluted sites when compared with their respective control sites and the other (2) fertilizer polluted sites, recorded less diverse plant species. There was increased in the density of monocotyledonous plant species such as: Maximum panicum, Pennisetum pedicellatum, Eragrostis spp and others. However, the fertiliser polluted sites are less reduced in plant species diversity when compared with their respective control sites. Passiflora foetida is the only plant species growing on the two (2) polluted sites but not in all control sites except that of fertilizer polluted control site. Oil spent polluted site, being the most vulnerable site to loss of plant species needs to be checked from continuity in order to guide against the worst occurrence that leads to climate change.