Allelopathic Effects of Chromolaena Odorata L. (R. M. King and Robinson – (Awolowo Plant’)) Toxin on Tomatoes (Lycopersicum esculentum Mill)

Allelopathic effects of Chromolaena odorata L. (R. M. KING AND ROBINSON) aqueous leaf extract and residues incorporated in the soil on the growth and water status of Lycopersicon esculentum Mill were studied. Significant growth reductions in Lycopersicon esculentum were observed from additions of C. odorata aqueous – leaf extract at concentrations as low as 1g fresh weight in 40ml of water. Reduction in growth was accompanied by decreases in leaf water potential. Incorporation of C. odorata leaf material into the soil in which L esculentum Mill seedlings were germinated and grown caused significant depression in growth over the 2-week test period with addition of 2g residue to 80g soil. Allelochemicals released from C. odorata plants and residue are suggested as a possible explanation for yield reductions in crops in fields where C. odorata plants are present. One mechanism of toxic action on seedlings involved interference with water balanc

Effect of palm bunch ash on the seed germination, seedling growth and biochemical parameter of soybean

The work was carried out to study the effects of Palm Bunch Ash (PBA) on seed germination, seedling growth and biochemical parameters of Soybean. Soybean seeds were raised in petri-dishes and irrigated with different concentrations of PBA (0-control, 10, 25,40,65,80 and 100%). At lower concentrations, PBA had promotory effects on all the parameters studied while 100% concentration had inhibitory effects

Allelopathic Effects of Chromolaena Odorata L. (R. M. King and Robinson - (Awolowo Plant')) Toxin on Tomatoes ( Lycopersicum esculentum Mill)

Allelopathic effects of Chromolaena odorata L. (R. M. KING AND ROBINSON) aqueous leaf extract and residues incorporated in the soil on the growth and water status of Lycopersicon esculentum Mill were studied. Significant growth reductions in Lycopersicon esculentum were observed from additions of C. odorata aqueous - leaf extract at concentrations as low as 1g fresh weight in 40ml of water. Reduction in growth was accompanied by decreases in leaf water potential. Incorporation of C. odorata leaf material into the soil in which L esculentum Mill seedlings were germinated and grown caused significant depression in growth over the 2-week test period with addition of 2g residue to 80g soil. Allelochemicals released from C. odorata plants and residue are suggested as a possible explanation for yield reductions in crops in fields where C. odorata plants are present. One mechanism of toxic action on seedlings involved interference with water balance. @ JASE

Water Balance and Proximate Composition in Cowpea (vigna unguiculata (l). Walps) Seedlings exposed to Drought and Flooding Stress

Studying the water balance and proximate composition in plants subjected to these stresses compared the influence of drought and flooding on cowpea seedlings. In drought plants the leaf water potential, its components and the proximate composition were markedly reduced by the end of the experimental period. In contrast, flooded cowpea seedlings did not show marked reduction in water potential and other parameters studied. From these results, it was concluded that cowpea strives better in a flooded environment than in a water stressed environment. @JASE

Water quality of Bodo Creek in the lower Niger Delta basin

The dynamics of some physicochemical parameters of Bodo Creek on the upper reaches of theAndoni-Bonny river system were studied between December 2005 and July 2006. There were significant differences (P<0.05) in Secchi Disc Transparency and salinity, while temperature, Dissolved Oxygen (DO), Biological Oxygen Demand(BOD), phosphate and nitrate concentrations were similar (P>0.05) between the spatial grids. The values recorded ranged from 26.7 to 30.1°C (Temperature);73-157 cm (Secchi Disc Transperancy); 6.2-22.7%0 (Salinity); 4.6-11.8 mgtl (DO); 0.7-8.2 mgtl (BOD); 0.047-2.300 mgtl (Phosphate) and 0.013 to 0.873 mgtl (nitrate). There were obvious seasonal flux in the ecological variables (P<0.05), except nitrate concentrations that were not statistically significant (P>0.05). The usefulnessof the results infuture monitoring and possible reasons for the observed environmental gradients are discussed

Allelopathic Effects of Chromolaena Odorata L. (R. M. King and Robinson – (Awolowo Plant’)) Toxin on Tomatoes (Lycopersicum esculentum Mill)

Allelopathic effects of Chromolaena odorata L. (R. M. KING AND ROBINSON) aqueous leaf extract and residues incorporated in the soil on the growth and water status of Lycopersicon esculentum Mill were studied. Significant growth reductions in Lycopersicon esculentum were observed from additions of C. odorata aqueous – leaf extract at concentrations as low as 1g fresh weight in 40ml of water. Reduction in growth was accompanied by decreases in leaf water potential. Incorporation of C. odorata leaf material into the soil in which L esculentum Mill seedlings were germinated and grown caused significant depression in growth over the 2-week test period with addition of 2g residue to 80g soil. Allelochemicals released from C. odorata plants and residue are suggested as a possible explanation for yield reductions in crops in fields where C. odorata plants are present. One mechanism of toxic action on seedlings involved interference with water balance. @ JASE

Allelopathic Effects of Chromolaena Odorata L. (R. M. King and Robinson – (Awolowo Plant’)) Toxin on Tomatoes (Lycopersicum esculentum Mill)

Allelopathic effects of Chromolaena odorata L. (R. M. KING AND ROBINSON) aqueous leaf extract and residues incorporated in the soil on the growth and water status of Lycopersicon esculentum Mill were studied. Significant growth reductions in Lycopersicon esculentum were observed from additions of C. odorata aqueous – leaf extract at concentrations as low as 1g fresh weight in 40ml of water. Reduction in growth was accompanied by decreases in leaf water potential. Incorporation of C. odorata leaf material into the soil in which L esculentum Mill seedlings were germinated and grown caused significant depression in growth over the 2-week test period with addition of 2g residue to 80g soil. Allelochemicals released from C. odorata plants and residue are suggested as a possible explanation for yield reductions in crops in fields where C. odorata plants are present. One mechanism of toxic action on seedlings involved interference with water balance. @ JASE

Plant species responses to oil degradation and toxicity reduction in soil

A field project located at the Botanical garden of the University of Port Harcourt was designed to evaluate changes in contaminants concentration and toxicity during phytoremediation. Vegetated plots were established by planting different plant species – legumes and vegetable (Abelmoschus,esculentus, Telfaria occidentalis and Vigna unguiculata) and applied with sawdust and chromolaena leaves at different intensities of oil pollution. Toxicity of the soil was evaluated using germination percentage, flowering, fruit set and weight. The reduction of toxicity was more with legume thanvegetables. However, total petroleum hydrocarbon concentration was lower by the end of the study in all the soils planted with the crops