Papers by OTOTE T O B I OBEHI
Three plant species; Ageratum conyzoides, Chromolaena odorata and Acalypha fimbrata were tested f... more Three plant species; Ageratum conyzoides, Chromolaena odorata and Acalypha fimbrata were tested for their ability to grow and accumulate three heavy metals namely Lead (Pb), Nickel (Ni) and Chromium (Cr) under high and low soil concentrations. Two of the three plant species were also observed for variation in growth and metal accumulating properties under conditions of interspecific competition in the treatment plot having the high heavy metal concentration.
The experimental design was such that three replicates were maintained for A. conyzoides in both the treatment and control plots. Similarly, three replicates were also maintained for Chromolaena odorata both in the treatment and control plots. However, two replicates were maintained in the treatment plot where Acalypha fimbrata and Chromolaena odorata were allowed to compete and in the treatment plot where Acalypha fimbrata grew alone.
Soil collected from a dumpsite served as the treatment while soil collected from a nursery served as the control. The experiment was terminated after ten (10) weeks of planting and the plants were harvested. Soil samples from the rhizosphere of the plants were collected in nylon bags. The roots of the plants were thoroughly rinsed in water to remove soil particles. All of the plant shoots were finally separated from the roots.
The particle size, organic matter, exchangeable acidity, total exchangeable bases, exchangeable cations, pH and total nitrogen contents of the soil were determined. Wet digestion and spectrophotometry were used to determine the heavy metal concentrations of the soil and plant sample materials.
At the end of the experiment, it was observed that high soil heavy metal concentrations inhibited the growth of the three plant species and that plants accumulate metals differently under differing conditions of competition and soil pH. It was also observed that plants are able to concentrate minerals in their rhizosphere through mass flow. Ageratum conyzoides had a metal accumulation shoot-to-root ratio of 1.34 for Lead, 7.29 for Nickel but 0.35 for Chromium in the non-competing treatment plot. Chromolaena odorata had a metal accumulation shoot-to-root ratio of 0.15 for Lead, 2.68 for Nickel but 0.47 for Chromium in the non-competing treatment plot. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot at 0.29 and 2.68 than in the non-competing treatment plot at 0.24 and 1.16 respectively.
Amongst the three plant species used for this experiment, Ageratum conyzoides had the highest phytoremediation incidence in both the Lead and Nickel polluted soils than any of the other two plant species. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot than in the non-competing treatment plot. However, none of the three plant species is a suitable candidate for the phytoremediation of Chromium polluted soils.
Two plant species both belonging to the Poaceae family were tested for their nutrient absorbing c... more Two plant species both belonging to the Poaceae family were tested for their nutrient absorbing capability in spite of diesel oil soil pollutions of varying degrees. The plants were cultivated in the green house for 8 weeks in 30 x 30cm polythene bags containing the experimental diesel contaminated soil. During the experimental period, the changes in the growth parameters of the plants were monitored. After eight weeks of monitored plant growth, the plants were harvested for nutrient content analysis. Soil from each plant pot was also collected for nutrient content assay.
Drafts by OTOTE T O B I OBEHI
The objective of this research was to establish a possible correlation between school facilities,... more The objective of this research was to establish a possible correlation between school facilities, their availability, utilization and maintenance alongside students’ academic performance in biology.
The total sample of one hundred and five (116) student chosen from the nine secondary schools in Ibadan South West local government area of Ibadan, Oyo state were randomly chosen for this study. Information gotten from the respondents was subjected to statistical analysis such as correlation, one-way ANOVA and regression.
The random sampling featured more female (57.8%) than males (42.2%) students with female performance in tests (51.7%) been generally higher than male performance (38.3%). There was a positive correlation (0.07) between the availability of school facilities and student performance. There was also a slight positive and significant correlation between the classes (0.11), gender of students (0.25) but a negative correlation with students’ age and performance in biology. Students in private schools performed better (51.7%) than their contemporaries in public schools (41.4%).
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Papers by OTOTE T O B I OBEHI
The experimental design was such that three replicates were maintained for A. conyzoides in both the treatment and control plots. Similarly, three replicates were also maintained for Chromolaena odorata both in the treatment and control plots. However, two replicates were maintained in the treatment plot where Acalypha fimbrata and Chromolaena odorata were allowed to compete and in the treatment plot where Acalypha fimbrata grew alone.
Soil collected from a dumpsite served as the treatment while soil collected from a nursery served as the control. The experiment was terminated after ten (10) weeks of planting and the plants were harvested. Soil samples from the rhizosphere of the plants were collected in nylon bags. The roots of the plants were thoroughly rinsed in water to remove soil particles. All of the plant shoots were finally separated from the roots.
The particle size, organic matter, exchangeable acidity, total exchangeable bases, exchangeable cations, pH and total nitrogen contents of the soil were determined. Wet digestion and spectrophotometry were used to determine the heavy metal concentrations of the soil and plant sample materials.
At the end of the experiment, it was observed that high soil heavy metal concentrations inhibited the growth of the three plant species and that plants accumulate metals differently under differing conditions of competition and soil pH. It was also observed that plants are able to concentrate minerals in their rhizosphere through mass flow. Ageratum conyzoides had a metal accumulation shoot-to-root ratio of 1.34 for Lead, 7.29 for Nickel but 0.35 for Chromium in the non-competing treatment plot. Chromolaena odorata had a metal accumulation shoot-to-root ratio of 0.15 for Lead, 2.68 for Nickel but 0.47 for Chromium in the non-competing treatment plot. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot at 0.29 and 2.68 than in the non-competing treatment plot at 0.24 and 1.16 respectively.
Amongst the three plant species used for this experiment, Ageratum conyzoides had the highest phytoremediation incidence in both the Lead and Nickel polluted soils than any of the other two plant species. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot than in the non-competing treatment plot. However, none of the three plant species is a suitable candidate for the phytoremediation of Chromium polluted soils.
Drafts by OTOTE T O B I OBEHI
The total sample of one hundred and five (116) student chosen from the nine secondary schools in Ibadan South West local government area of Ibadan, Oyo state were randomly chosen for this study. Information gotten from the respondents was subjected to statistical analysis such as correlation, one-way ANOVA and regression.
The random sampling featured more female (57.8%) than males (42.2%) students with female performance in tests (51.7%) been generally higher than male performance (38.3%). There was a positive correlation (0.07) between the availability of school facilities and student performance. There was also a slight positive and significant correlation between the classes (0.11), gender of students (0.25) but a negative correlation with students’ age and performance in biology. Students in private schools performed better (51.7%) than their contemporaries in public schools (41.4%).
The experimental design was such that three replicates were maintained for A. conyzoides in both the treatment and control plots. Similarly, three replicates were also maintained for Chromolaena odorata both in the treatment and control plots. However, two replicates were maintained in the treatment plot where Acalypha fimbrata and Chromolaena odorata were allowed to compete and in the treatment plot where Acalypha fimbrata grew alone.
Soil collected from a dumpsite served as the treatment while soil collected from a nursery served as the control. The experiment was terminated after ten (10) weeks of planting and the plants were harvested. Soil samples from the rhizosphere of the plants were collected in nylon bags. The roots of the plants were thoroughly rinsed in water to remove soil particles. All of the plant shoots were finally separated from the roots.
The particle size, organic matter, exchangeable acidity, total exchangeable bases, exchangeable cations, pH and total nitrogen contents of the soil were determined. Wet digestion and spectrophotometry were used to determine the heavy metal concentrations of the soil and plant sample materials.
At the end of the experiment, it was observed that high soil heavy metal concentrations inhibited the growth of the three plant species and that plants accumulate metals differently under differing conditions of competition and soil pH. It was also observed that plants are able to concentrate minerals in their rhizosphere through mass flow. Ageratum conyzoides had a metal accumulation shoot-to-root ratio of 1.34 for Lead, 7.29 for Nickel but 0.35 for Chromium in the non-competing treatment plot. Chromolaena odorata had a metal accumulation shoot-to-root ratio of 0.15 for Lead, 2.68 for Nickel but 0.47 for Chromium in the non-competing treatment plot. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot at 0.29 and 2.68 than in the non-competing treatment plot at 0.24 and 1.16 respectively.
Amongst the three plant species used for this experiment, Ageratum conyzoides had the highest phytoremediation incidence in both the Lead and Nickel polluted soils than any of the other two plant species. Acalypha fimbrata had a higher metal accumulation shoot-to-root ratio of both Lead and Nickel in the competing treatment plot than in the non-competing treatment plot. However, none of the three plant species is a suitable candidate for the phytoremediation of Chromium polluted soils.
The total sample of one hundred and five (116) student chosen from the nine secondary schools in Ibadan South West local government area of Ibadan, Oyo state were randomly chosen for this study. Information gotten from the respondents was subjected to statistical analysis such as correlation, one-way ANOVA and regression.
The random sampling featured more female (57.8%) than males (42.2%) students with female performance in tests (51.7%) been generally higher than male performance (38.3%). There was a positive correlation (0.07) between the availability of school facilities and student performance. There was also a slight positive and significant correlation between the classes (0.11), gender of students (0.25) but a negative correlation with students’ age and performance in biology. Students in private schools performed better (51.7%) than their contemporaries in public schools (41.4%).