Okonwu Kalu

Okonwu Kalu
University of Port Harcourt · Department of Plant Science & Biotechnology

Doctor of Plant Physiology

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44
Publications
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113
Citations

Publications

Publications (44)
Article
Full-text available
The study used High-Performance Liquid Chromatography to evaluate the organic acid profile in the fluted pumpkin, Telfairia occidentalis leaves grown in NPK 20-10-10 and urea hydroponic solutions. Two-week old seedlings of fluted pumpkin raised using River-sand were transferred into the growth media (Control, M 25 NPK, M 50 NPK, M 75 NPK, M 100 NPK...
Article
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The leaf and root of Bryophyllum pinnatum (Lam.) Oken were evaluated for proximate composition, vitamins, amino acids, phytochemicals, mineral elements, micro-morphology and its antifungal activities on some selected fungal species obtained from diseased Arachis hypogaea seeds. These were assessed following standard procedures. The study showed tha...
Research
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The effects of ethanolic and aqueous extracts of Zingiber officinale (ginger) were evaluated on the germination and growth of Vigna unguiculata var. IT-268 in the laboratory and field, University of Port Harcourt. The concentrations of ethanol and aqueous ginger extracts were 0%, 25%, 50%, 75% and 100%, respectively in the laboratory. Field trials...
Article
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The study assessed and quantified some bioactive constituents (proximate, vitamins, amino acids) and minerals in the leaves and roots of Acalypha wilkesiana L. and Acalypha hispida L. used in the treatment of some ailments. Standard procedures were followed in the assessment. The proximate composition varied in the leaves and roots of A. wilkesiana...
Article
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Background and Objective: The plant, Telfairia occidentalis Hooker fil. contains the varying composition of phytochemicals and has been grown mostly in geoponic media. The study aimed at evaluating the anti-nutrient composition of T. occidentalis leaf grown in different urea hydroponic solutions. Materials and Methods: The Urea solutions varied in...
Article
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Background and Objective: Selection of appropriate seed size has become a huge challenge considering the anticipation of bumper harvest. The study evaluated the effect of seed sizes on the growth and development of three legumes (Vigna unguiculata (L.) Walp., Arachis hypogaea L. and Glycine max (L.) Merrill) grown in Nigeria. Materials and Methods:...
Article
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The growth of fluted pumpkin in different solid media was assessed. The media used were humus-soil, white-sand and sawdust. The growth indices (vine length, number of leaves, leaf area, vein girth, petiole length, internode and pigment) of fluted pumpkin were measured and physicochemical composition of the growth media analysed following standard p...
Article
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The study was aimed at quantifying and comparing some of the bioactive compounds present in the leaves of Lasianthera africana and Piper umbellatum. These bioactive compounds are proximate composition, mineral composition, vitamins, amino acids, chlorophyll and carotenoids. Standard procedures were followed to determine both the presence and concen...
Article
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This study evaluated the nutritional composition of some of the most consumed cereals and legumes in Nigeria. The study is aimed at providing nutritional facts about these grains, which will guide its consumption based on nutritional requirement of individuals. These cereal grains were millet (Pennisetum glaucum), maize – hybrid IART, hybrid Oba su...
Article
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The study focused on the use of Urea containing hydroponic solutions for growing Telfairia occidentalis Hooker fil and evaluated the bioactive compounds and mineral contents of T. occidentalis. They solutions varied in the amount of Urea granules (25g, 50g, 75g, 100g, 125g and 150g, respectively) dissolved in water and designated as M 25 U, M 50 U,...
Article
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Studies on nutrient and mineral contents of fluted pumpkin, Telfairia occidentalis Hooker fil. leaves grown in different NPK 20-10-10 solutions. The solutions varied in the amount of NPK (20-10-10) and granules (25 g, 50 g, 75 g, 100 g, 125 g and 150 g, respectively) dissolved in water containing micronutrients. The growth media were M25NPK, M50NPK...
Article
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The effect of shade on the germination, growth, and development of Abelmoschus esculentus (L.) Moench (Okra) was investigated. This experiment was carried out using two varieties of A. esculentus seeds (Kirikoa F1 and Hire varieties) which were replicated 5 times for both under shade and under direct sunlight as growth conditions. The seeds and soi...
Article
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The effects of GA 3 and KNO 3 on the seed germination and DNA concentration of flax (Linum usitatissimum L.) radicle were investigated. These growth stimulants were gibberellic acid (GA 3), and potassium nitrate (KNO 3) with concentrations of 0 mM (Control), 1 mM, 5 mM and 10 mM. The flax seeds were surface sterilized in ethanol for 5 minutes and r...
Article
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Effects of gibberellic acid (GA3), 6-benzylaminopurine (BAP) and potassium nitrate (KNO3) on the seed germination and DNA concentration of cucumber (Cucumis sativus) radicle were assessed. The concentrations of these growth stimulants were 0 mM, 1 mM, 5 mM and 10 mM. The cucumber seeds were surface sterilized in ethanol for 5 minutes and rinsed wit...
Article
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The Water 616/626 HPLC was used as a tool for identifying and quantifying the organic acids, glycosides and phenolic compounds of Telfairia occidentalis pumpkin leaves grown in hydroponic and geoponic media. Standard procedures were adopted for the determination of these secondary metabolites. The study showed that the organic acids, glycosides and...
Article
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Cucurbita moschata is widely grown in both tropical and temperate region due to its structural adaptability. The study was carried out to assess the performance of C. moschata on soil (humus) and soilless media (NPK 15:15:15 and NPK 20:10:15 growth media). These treatments are designated as TC, TA and TB, respectively. Standard procedures were foll...
Article
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The quantitative assessment of phytochemicals in Lasianthera africana P.Beauv and Piper umbellatum L. leaves eaten mostly in southern Nigeria were carried out. The phytochemicals (hydrogen cyanide, oxalate, phytate, tannin, saponin, trypsin-inhibitor, alkaloid, flavonoids, and organic acids) were assessed following standard analytical procedures. T...
Article
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The phytochemical components of Telfairia occidentalis Hook F. leaf grown in soil (HS) and soilless (NM) media were assessed using High Performance Liquid Chromatography (HPLC). The media used for the soil medium and soilless medium were humus soil and hydroponic solution, respectively. White-sand from the river was used to raise the seedlings befo...
Article
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The study was carried out to determine the micromorphological structure and quantify the phytochemical components of Cleome rutidosperma Linn. The study revealed the presence of five stomatal types (anomocytic, staurocytic, tetracytic, anisocytic and isotricytic) and polar contiguous stomata on both abaxial and adaxial surface of the leaf of C. rut...
Article
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The anti-nutrient compositions of fluted pumpkin leaf grown in three different geoponic media were quantified. These media were white-sand (WS), humus soil (HS) and sawdust (SD). The anti-nutrients composition of matured pumpkin leaf assessed were alkaloids, flavonoids, saponins, hydrogen cyanide, trypsin-inhibitor, oxalate, tannins and phytate. St...
Article
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The nutritional composition of the leaf, rhizome and seed of Canna indica L. were examined. The nutritional composition of C. indica plant showed that the rhizome of C. indica contains 50.66% moisture, 4.17% carbohydrate, 4.81% protein, 2.85% ash, 4.35% lipid and 33.16% fibre. The leaf on the other hand, contains 87.54% moisture, 2.19% carbohydrate...
Article
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Studies on some growth indices of Capsicum annuum L. species in loamy soil amended with wood biochar (charcoal) of Pentaclethra macrophylla was investigated in the Ecological Centre, University of Port-Harcourt, Port Harcourt, Nigeria with a view to elucidate its potential for enhancing crop yields and plant productivity. Six treatments viz; 0, 5,...
Article
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Investigation on the effects of gas flaring on some growth indices of maize was conducted at the SPDC flow station, Elelenwo. Three weeks old healthy seedlings of maize (Zea mays L.) were raised in the nursery before transferring to the field. Five pots (40cm x 50cm each) containing some maize plants were placed at different distances away from the...
Article
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The study was carried out to determine the tannin content of five economic plants indigenous to Nigeria. These plants belongs to the families Poaceae (Maize), Fabaceae (Cowpea, Groundnut), Euphorbiaceae (Cassava) and Malvaceae (Okra). The study showed that the percentage tannin content of these plants decreased from week one to week four after plan...
Article
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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 allowe...
Article
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Study on the soil fertility status of University of Bort Harcourt, Nigeria was carried out with respect to its land use types. The aim was to establish preliminary data for further studies in the area. Four soil samples were collected randomly from eight plots (10x10 m) length; air dried and analysed to assess the fertility status of the soils. The...
Article
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Studies on soil amended with poultry manure (PM) and its effects on some growth parameters of pumpkin, Cucurbita moschata (Duch. ex Lam.) Duch. ex Poir. were conducted at the University of Port Harcourt Botanical Garden. Six treatments viz; 0, 1, 2, 3, 4 and 5 tons of poultry manure per hectare (t PM/ha) were used in a randomized complete block des...
Article
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The effects of NPK (15:15:15) fertilizer on nutrient uptake of Cucurbita moschata (Duch. ex Lam.) Duch. ex Poir. were conducted at the University of Port Harcourt Botanical Garden. Eight treatments viz; 0, 200, 250, 300, 350, 400, 450 and 500 kilogram of NPK per hectare (kg/ha) were used in a randomized complete block design (RCBD) with four replic...
Article
Full-text available
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 on...
Article
Full-text available
The effects of poultry manure (pm) on nutrient uptake of Cucurbita moschata (Duch. ex Lam.) Duch. ex Poir. were conducted in the University of Port Harcourt Botanical Garden. Six treatments viz; 0, 100, 200, 300, 400 and 500 kilogram of poultry manure per hectare (kg pm/ha) were used in a randomized complete block design (RCBD) with four replicates...
Article
Full-text available
The performance of maize (Zea mays) in crude oil treatment was investigated at the University of Port Harcourt botanical garden. Germination and growth responses of Z. mays were examined using various crude oil pollution treatments. There was no significant difference in the germination and development of Z. mays subjected to oiling at 1-3% compare...
Article
Full-text available
Growth and development response of Zea mays were investigated at the University of Port Harcourt botanical garden. Crude oil pollution effects of direct spray on foliage or spill on soil on the growth changes and chlorophyll content of Z. mays were examined, alongside a control. There were significant (p = 0.05) reductions in chlorophyll content in...

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