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Articles by U.N. Uka
Total Records ( 8 ) for U.N. Uka
  K.S. Chukwuka , A.I. Ogunsumi , M.C. Obiakara , O.M. Ojo and U.N. Uka
  The effects of decaying leaf litter of T. diversifolia, V. amygdalina as organic fertilizer and inorganic fertilizer (NPK 15-15-15) and their combination effects on the growth and development of maize were studied in a Screen House. Twenty four experimental bags filled with 20 kg of loamy soil were laid out in a completely randomized design with six treatments and four replications for each treatment which include: 250 g of decaying leaves of T. diversifolia as mulch (T1), 250 g of decaying leaves of V. amygdalina (T2), 1.52 g of NPK (inorganic) fertilizer (T3), a mixture of 250 g decaying leaves of T. diversifolia and 1.52 g of NPK (15-15-15) fertilizer (T4), a mixture of V. amygdalina and 1.52 g NPK (15-15-15) fertilizer (T5) and control (T6). Significant growth as well as maize yields were obtained from T3 treated maize groups and this was closely followed by T4 seedlings. The study showed that the decaying leaf litter as organic fertilizer in maize production in a Screen House condition did not give better yield than NPK treatment alone.
  K.S. Chukwuka , U.N. Uka and O.E. Omotayo
  In order to proffer an effective management of weeds in agroecosystems, a study which revolves around recognizing the crop-weed inter-relationship is needed. In the light of the above, the interaction of Abelmoschus esculentus (L.) Moench and Tithonia diversifolia (Hemsl) A. Gray) in an agroecosystem located in the University of Ibadan was studied. Abelmoschus esculentus and Tithonia diversifolia were planted in plastic pots in a randomized block design and watered at alternative days with 2 L of water per pot. Results showed that Abelmoschus esculentus planted alone had the greatest plant height, stem diameter, leaf area, number of leaves and biomass accumulation than Tithonia diversifolia grown alone. However, analysis of variance carried out with each of the plants revealed that Tithonia diversifolia had a significant effect (p<0.05) on the dry weight of shoot and root of Abelmoschus esculentus and also on its number of leaves. Abelmoschus esculentus had no significant effect on the leaf area. The inferences of these results were discussed.
  U.N. Uka and K.S. Chukwuka
  Water hyacinth infested and open water areas in AWBA reservoir were sampled fortnightly between July and November 2005. The effect of water hyacinth infestation on the aquatic biota was assessed using physico-chemical parameters. The study showed that conductivity, total suspended solids, free carbon dioxide and turbidity were significantly higher (p<0.05) in water hyacinth infested area than in open water. Dissolved oxygen, pH and nitrate-nitrogen were significantly lower (p<0.05) in the infested areas when compared with open water. Temperature was higher in the infested area than open water but was also not significant (p>0.05). The study suggested that water hyacinth infestation negatively impacted on the reservoir and therefore should be eradicated.
  U.N. Uka and K.S. Chukwuka
  Aquatic macrophytes are basically seen as those plants that complete their life cycle in water and cause harm to the aquatic environment. The attention of fishery managers is always towards the eradication of aquatic macrophytes. This study is therefore timely as it reflects on the economic importance of aquatic macrophytes in aquatic ecosystem and therefore recommends a study on the utility value of aquatic macrophytes of ecological importance. The monitoring of colonized rivers and large water bodies by aquatic plant is necessary for proper management and development of colonization model is hereby advocated.
  H.A. Mohammed , U.N. Uka and Y.A.B. Yauri
  The high cost of fish feed especially in the developing countries has led to the dwindling economic fortunes on aquaculturists and slow pace of expansion of intensive fish culture in the underdeveloped world. To forestall this challenge, efforts are now geared towards the use of non-conventional fish feed, thus making aquaculture more cost effective to farmers. One of the options is the use of aquatic macrophytes. In this study, the nutritional potential of the plant parts (leaves, petiole, root, rhizome) and seeds of Water lily harvested from Tatabu flood plain/wetlands were evaluated through proximate compositions and analyzed in percentages. Moisture content was highest in the rhizome (20.40±1.241) while the seeds gave the lowest value of (4.18±0.176). The highest value for Ash content was observed in the root (27.36±1.261) and the seeds gave the lowest (2.81±0.498). Highest value for the Crude fat was obtained from the seeds (9.95±0.637) while the petiole gave the lowest value of (2.27±0.377). The crude protein and crude fibre values were highest in the leaves 19.54±0.782 and 15.53±0.448, respectively while the lowest was obtained in the seeds 3.27±0.104 and 1.60±0.200, respectively. There was a significant differences among the parts analyzed for the Ash content (p<0.05). The NFE varied from 31.21±2.176 to 78.15±1.418. This study suggests that Water lily could be a good source of protein for incorporation in fish diet.
  U.N. Uka , H.A. Mohammed and E. Aina
  The increase of urban and industrial activities has led to pollution and deterioration of Asa river. A study aimed at ascertaining heavy metal concentrations and allocation in Phragmites karka growing in polluted sites of Asa River with the prospect of using Phragmites karka in phytoextraction of zinc, copper, cadmium and lead was carried out. Phragmites karka was separated into (roots, stem and leaves), water and sediment samples were collected from three sampling points in Asa River were analysed using Flame atomic absorption Spectrophotometer. The results of the translocation ability were in the order Cu>Zn>Cd and Pb. The bioconcentration factor for Zn, Cu, Cd and Pb in the root, stem and leaf had low values thus, a limited transportability of heavy metals from the sediment to the plant. Heavy metal accumulation in the roots was greater than those of the shoots. The quantities of accumulation in the roots were in the order Zn>Cu>Pb>Cd. Translocation values>1 were found for Zn and Cu while Translocation values for Cd and Pb<1. It can be deduced from the result that these metals (Zn, Cu, Cd and Pb) have limited translocation to the aerial parts of plant. Cu and Zn accumulations are transported to shoots while Cd and Pb are stored in the roots. Enrichment coefficient of Zn, Cu, Pb and Cd was <1.0. This study suggests that Phragmites karka is less suitable for sequestering of these studied heavy metals.
  U.N. Uka , K.S. Chukwuka and F. Daddy
  The study offers management guidelines for control and management of water hyacinth in Nigeria. Water hyacinth (Eichhornia crassippes) which before 1984 was alien to Nigerian water systems has now spread to over 20 of the 36 states including the Federal Capital Territory. The weed not only disrupts the ecology of the systems but also adversely affects the sociological, cultural and economic realities of the indigenous communities especially the artisanal fisher folks within the area. This study reviews the concerted efforts of Nigerian government in water hyacinth control. It also outlines the machineries set up by the government for control and management of water hyacinth. The bilateral co-operation on water hyacinth control between Nigeria and her neighbouring countries are highlighted.
  U.N. Uka , K.S. Chukwuka and C. Afoke
  Leachates from waste dumpsites in Abakaliki metropolis, South eastern Nigeria has become a major source of heavy metal pollution to the soil. Cultivation of Telfaria occidentalis is practiced in these waste dumpsites due to its high organic matter in order to increase yields. Telfaria occidentalis grown on two selected waste dumpsites in the metropolis was collected. Heavy metals (Cu, Zn, Pb and As) in their plant parts as well as in the soil were determined using digestion and Atomic Absorption Spectrophotometric methods. Heavy metal values in leaf were highest for Pb followed by shoot. Pb ranged from 0.35-0.54 mg kg-1, Copper ranged from 0.02-0.07 mg kg-1 and Zn ranged from 0.04-0.06. Transfer factors were high suggesting that consumption of vegetables grown on the waste dumpsites is dangerous to human health. The Translocation Factor (TLF) for As, Pb and Cu was higher than 1.0 but lower than 1.0. The enrichment coefficient of Pb and As was higher than 1.0. In view of plants role in food chain, cultivation of Telferia occidentalis in waste dumpsites should be eschewed.
 
 
 
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