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Articles by S.I. Mensah
Total Records ( 5 ) for S.I. Mensah
  K. Okonwu and S.I. Mensah
  Effects of NPK (15:15:15) fertilizer on some growth indices of pumpkin, Cucurbita moschata (Duch. ex Lam.) Duch. ex Poir. were studied. Eight treatments viz; 0, 200, 250, 300, 350, 400, 450 and 500 kg of NPK fertilizer per hectare (kg ha-1) were used in a Randomized Complete Block Design (RCBD) with four replicates. These treatments were applied once to two week-old seedlings of C. moschata using ring method. The effects of these treatments on Leaf Area (LA), stem diameter (STD) and number of leaves (NL) were monitored weekly while fresh weight and dry weight were determined after 6 weeks. Soil Organic Matter (OM), Organic Carbon (OC), ash content, pH and nutrient (N, P, K, Ca, Na and Mg) levels were also monitored at 0, 2 and 6 weeks. The study showed that NPK fertilizer increased the LA, STD, NL and nutrient (N, P, K, Ca, Na and Mg) contents of the soil. The highest leaf area, stem diameter, fresh weight and dry weight were obtained from NPK treatment at 300 kg ha-1 while 350 kg ha-1 rate gave the highest number of leaves. Two weeks after treatment, the concentrations of N, Ca, Mg, OM and OC content in the soil were highly increased by the 400 kg ha-1 treatment but the 500 kg ha-1 rate gave the highest concentrations of K and Na. The study after six weeks showed that 450 kg ha-1 rate gave the highest concentrations of Ca, Mg and K in the soil whereas 500 kg ha-1 rate gave the highest concentrations of P, Na and ash content. The 350 kg ha-1 gave the highest N, OM and OC content. At p<0.05, there were significant difference among treatments. The use of NPK fertilizer at an application range between 400 and 450 kg NPK ha-1 is therefore recommended for growing of C. moschata and improvement of the soil nutrients level.
  K. Okonwu , S.I. Mensah and S.M. Sam
  Calopogonium mucunoides Desv. was subjected to varying concentrations of crude oil equilibrated with water. Five treatments viz 0, 5, 10, 20 and 30% were used in a Randomized Complete Block Design (RCBD) with three replicates. These treatments were applied once to two weeks old seedlings of C. mucunoides using ring method and the plants were allowed to stand for eight weeks. The effects of these treatments on plant height, leaf area and biomass of C. mucunoides were studied. The total chlorophyll contents were also studied. The study showed that 5% treatment gave the highest value for plant height and biomass content while 10% treatment gave the highest value for leaf area and chlorophyll content when compared to control (0%) respectively. It was observed that as the concentration of the crude oil increases, there were corresponding reduction in the plant height, leaf area, biomass and chlorophyll content. These results implied that C. mucunoides can tolerate to some degree of crude oil contamination and thus can be used for phytoremediation in crude oil contaminated soil.
  S.I. Mensah , K. Okonwu and M. Yabrade
  Effects of crude oil application on the growth of Rhizophora racemosa seedlings were conducted at undisturbed tidal inundated mangrove wetland, beside the Chevron yard along Escravos River in Warri, Delta State. Seedlings of R. racemosa were subjected to four crude oil treatments viz., control (0 mL), moderate (20 mL), chronic (40 mL) and acute (100 mL), in a randomized complete block design with five replicates. Treatments were applied weekly for moderate and chronic treatments while acute treatment was a single dose using ring method. The growth indices assessed after 12 weeks were plant height, stem girth, number of leaves, leaf length, leaf width, biomass and total chlorophyll of R. racemosa in soil containing varying treatments. The results showed that mangrove seedlings, R. racemosa were sensitive to and were negatively impacted by moderate, chronic and acute exogenous application of escravos crude oil when compared with the control. The results showed that the control treatment gave the highest mean value for plant height and stem diameter of seedlings (40.98±1.783, 0.80±0.058), respectively when compared with other treatments. The number of leaf drop, biomass and chlorophyll content showed a similar trend, respectively. There were significant difference among treatments at p<0.05. This study provides insight on the potential risk associated with R. racemosa seedlings development exposed to crude oil contamination. The study recommends that crude oil pollution should be stop or minimized to the barest minimum during oil exploration and extraction in the mangrove environment.
  C. Ekeke and S.I. Mensah
  In this study, we investigated the comparative anatomy of 17 species from 14 genera of Asteraceae occurring in Nigeria. Dried materials obtained from University of Port Harcourt Herbarium (UPH) were used for this study. The midrib of specimens were hand sectioned, stained with 1% safranin or alcian blue, mounted on slide, observed under microscope and micro-photographed using Leica WILD MPS 52 microscope camera on Leitz Diaplan microscope. The results showed that twelve species Aspilia africana, Chromolaena odorata, Conyza sumatrensis, Emilia preatamissa, Eleutheranthera ruderalis, Metanthera scandens, Synedrella nodiflora, Tithonia diversifolia, Tridax procumbens, Vernonia cinarae, Vernonia biafrae and Emilia coccinea have secretory duct while Adenostemma sp., Ageratum conyzoides, Bidens pilosa, Eclipta alba and Vernonia amygdalina not have secretory ducts. The number of abaxial and adaxial parenchymatous cells, shape of the midrib, number and arrangement of the vascular bundle varied form one species or genera to other. These characters are dependable in delimitating the family.
  C. Ekeke , T.T. Manga and S.I. Mensah
  Background and Objective: Amaranthus hybridus and Amaranthus spinosus are widely distributed in Nigeria and are being used as medicinal plants. The comparative morphological, anatomical and phytochemical studies were carried out on 2 species of the genus Amaranthus L. (A. hybridus and A. spinosus) to determine their differences to easy their identification and potential sources of raw materials for pharmaceuticals. Materials and Methods: Standard HPLC method was used for phytochemical screening. For anatomical study, fresh specimens were dehydrated, wax embedded, sectioned, mounted and micro-photographed using Optika B-1000 FL LED fitted with digital camera and morphological study was done by visual observation. Results: The presence of spines on A. spinosus distinguishes it from A. hybridus. Also, the stem of A. spinosus is reddish-brown while that of A. hybridus is light green. The number of vascular bundles in the midrib, petiole, stem and root were different and could be used to differentiate them. Data obtained from the quantitative phytochemical analysis showed that their concentrations varied among the 2 species. Amaranthus hybridus had 72.56 and 61.79% vitamin A in the root and leaves, respectively while compared to A. spinosus. Leaves of A. hybridus had higher total flavonoids concentration of 56.46% while A. spinosus had the highest phenolics of 19.27 g/100 g and 18.63 g/100 g in the leaves and roots, respectively. Also, the roots of A. spinosus had the highest concentration of alkaloids, glycosides and phenolics. These explain why they are used in ethno-botany in Nigeria. Conclusion: Based on the phytochemical constituents, both plants could be valuable sources of dietary vitamins and potential sources of phytochemicals if properly exploited.
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