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Articles by Edokpolor Osazee Ohanmu
Total Records ( 3 ) for Edokpolor Osazee Ohanmu
  Edokpolor Osazee Ohanmu and Beckley Ikhajiagbe
  Background and Objective: Weeds reduced cowpea yield and quality by competing for light, water and nutrients. Hence identifying a cowpea cultivar that completes well against weeds will go a long way in increasing food sustain ability and security. Therefore, this study investigated the competition between cowpea (TVU-180) and selected weeds prominent in a typical ultisol. Materials and Methods: The study involved 10 treatments and a control. Each treatment included three seeds of the cowpea sowed alongside the selected weeds, Chrysopogon aciculatus (WA), Eleusine indica (WB), Cynodon dactylon (WC), Axonopus compressus (WD), Panicumn maximum (WE), Setaria bartata (WF), Sporobolus pyramidalis (WG), Commelina benghalensis (WH), Paspalum vaginatum (WI), a combination of the weeds (WJ) and the control arranged in a randomized block design (RBD) and replicated thrice. Results: The result of the study showed that there were significant weed competitive effect on the cowpea parameters examined. The plant height and number of leaflet of cowpea in WE, WA and WJ treatments were significantly increased over the control. No yield parameters were recorded in the associated weed treatments except in WA, WI and the control. However, weed competitiveness significantly reduced the bean yield of the cowpea in the WI and WA treatments. Weed competitiveness resulted in the lowest plant dry weight of the TVu-180 in WB when compared with control. There was variation in the light harvesting pigments with WH, WI and WB having a higher chlorophyll-a/b, carotenoid and lycopene content than the control. The WA and the control had the highest soil total N, P and K content. Conclusion: The cowpea TVu-180 variety was more promising for cultivation in a farm infested with Chrysopogon aciculatus and Paspalum vaginatum weeds without significant effects in the yield and quality of the plant.
  Beckley Ikhajiagbe , Edokpolor Osazee Ohanmu and Mary Osasere Iguobaro
  Background and Objective: The problem caused by weeds are enormous and constitute a major constraint to crop production globally. Over the years, weed has contributed to the reducing in cowpea productivity either by releasing allelopathic compounds, providing a conducive environment for pest or competing for available soil nutrients. Therefore, the study examined the competition between the cowpea variety (TVu-180) and selected local weeds abundant in a typical ultisol in Benin city, Nigeria. Materials and Methods: There were 10 treatments and a control, namely; Chrysopogon aciculatus (WA), Eleusine indica (WB), Cynodon dactylon (WC), Axonopus compressus (WD), Panicumn maximum (WE), Setaria bartata (WF), Sporobolus pyramidalis (WG), Commelina benghalensis (WH), Paspalum vaginatum (WI), while WJ was a combination of all the weeds and control (CTR). Three seeds of TVu-180 was sown into each bowl per-treatments, laid out in a Randomized Block Design (RBD) with three replications. Results: From the results, the associated weeds delayed the first day of emergence in TVu-180 variety, however, there was no significant difference between the treatments and control. The emergent height of TVu-180 in WC, WE and WF were significantly higher than the TVu-180 variety in control. Weeds competitiveness with the TVu-180 variety resulted in a highly significant decrease in the plants’ dry weight either singly or holistically when compared with the control. The shoot length, stem width and leaflet area of the TVu-180 variety in WA were higher than those in the control. However, the no. of leaves were reduced in all treatments, there was no significant difference in between the TVu-180 variety in the WA treatment and control. Weed competitiveness resulted in the highest percentage of foliar foraging, chlorosis and necrosis in TVu-180 variety of WG and WC, respectively. From the regression plot, there was an inverse relationship between foliar chlorosis and percentage N, P and K in the soil while the correlation showed a significant positive relationship between foliar foraging and foliar chlorosis and necrosis respectively. Conclusion: Weed competitiveness did not affect the emergence performance of the Tvu-180 variety, however, the variety was morphologically susceptible with a significant reduction in dry weight matter.
  Edokpolor Osazee Ohanmu , Sunday Paul Bako , Erhunmwunse Ohanmu and Osayuwame Osaretin Ohanmu
  In Nigeria, oil exploitation occurs in the Niger Delta region which is one of the world's largest wetlands and includes by far the largest mangrove forest in Africa with a biological diversity of global significance. The study aimed in creating a synergy between the environment, farming system and crude oil sector with the need of government to implement feasible policies that will protect the health of all for a sustainable ecosystem. This review was achieved by using the online archives and personal interactions. The high demand for and use of petroleum and its derivatives worldwide has made petroleum hydrocarbon contamination a global problem with serious health and environmental consequences. One of the environmental challenges posed by oil pollution is the alteration in the physical and chemical nature of the soil which subsequently affects the growth of plants. Petroleum hydrocarbon contamination may affect plants by retarding seed germination and reducing height, stem girth, photosynthetic rate or resulting in complete mortality. In this review, relevance of crude oil in Nigeria and its environmental implication to the ecosystem was highlight.
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