Research Papers/Topics in Plant Physiology And Crop Ecology

Response Of Spk 004 To Meloidogyne Species Infestation And Impact Of Sweet Potato Management Practices On Nematofauna In Mwea, Kenya.

ABSTRACTSweet potato (Ipomoea batatas L.) is an important food crop consumed throughout Africa. However, sweet potato yields are greatly reduced by pests including plant parasitic nematodes. Management of nematodes in sweet potato fields in Kenya has mainly been through the use of nematicides and crop rotation which have limitations. The use of resistant sweet potato cultivars along with other low-cost organic amendments is the most economical, effective, and environmentally safe method of ma...

Response Of Spk 004 To Meloidogyne Species Infestation And Impact Of Sweet Potato Management Practices On Nematofauna In Mwea, Kenya

TABLE OF CONTENTSDECLARATION................................................................................................................ iDEDICATION................................................................................................................... iiACKNOWLEDGEMENT ............................................................................................... iiiLIST OF TABLES ....................................................................................................

Phytoplankton Composition, Growth Rates And Oil Production Potential Of Fast Growing Species From Lake Naivasha And Water Reservoirs At Embu University College

ABSTRACTThe demand for non-renewable fossil fuel has greatly increased in the last few years from 84 million barrels of fossil fuel per day in 1980’s to over 100 million barrels per day in 1990. To supplement this demand, research on alternative sources has been going on since 1960’s in different parts of the world. Among the alternative sources, the phytoplanktons have shown great promise due to their high oil yield in comparison to energy crops. In Kenya, despite the occurrence of highl...

Drought Prevalence In The Horn Of Africa And Its Implications On Forest Cover: A Case Study Of Somalia

ABSTRACTSomalia is one of the most drought prone countries in Africa. Drought is the country’s costliest natural disaster. The impact of drought events on the economy, on people`s livelihoods and on lives has grown. Drought events usually develop gradually unnoticed, causing tremendous effects on both agriculture and environment. This study evaluated the spatio-temporal variations of drought occurrences in Somalia and its implication on forest cover. In this study, precipitation and tempera...

Nematode Parasites Of The Nile Tilapia (Oreochromis Niloticus, Linnaeus, 1758) And The Sharptooth Catfish (Clarias Gariepinus, Burchell, 1822) In Lower Umguza Dam

ABSTRACT The study sought to determine abundance and species of nematode parasites of Oreochromis tilapicus and Clarias gariepinus in Lower Umguza Dam,in the Gwayi catchment area. Fish samples were collected from fishermen and sent to the laboratory for observation and identification using standard parasitological methods and identification guides. 479 nematode parasites were recovered from 160 fish belonging to 2 species; Oreochromis tilapicus and Clarias gariepinus. Four nematode gene...

Rooting Strategies Of Savanna Shrubs In The Kalahari Basin: Implications For The Coexistence Of Woody And Herbaceous Plants And Shrub Encroachment In The African Savannas

Abstract The savanna biomes are characterised by a coexistence of two antagonist – woody plants and herbaceous plants in defiance of competing theories. Scientific efforts to understand this unique coexistence are still largely inconclusive; various theories have been proposed, but no unanimous theoretical framework exists to date. Among these theories, the root niche-partitioning model offers the most popular, yet the most controversially debated viewpoint. It argues that this coexis...

Biophysical Interactions in the Iceland Basin

AbstractThe Iceland Basin in the N. Atlantic has attracted considerable recent attention because the spring bloom in this region acts as the mostpowerful biological carbon pump anywhere in the world oceans. Furthermore, the link between primary productivity and herbivory by thecalanoid copepod, Ca/anus finmarchicus provides the trophic link between primary producers and the important commercial fishery for Atlantic Cod. However one result of ocean warming is that th...

~he· Chactognatha Community of the Agulhas Current:· Its s.tJ'tlcture and .related properties.

A studa' has been made of a select group ·o.f .m:tari:ne £ooplan.kton-the Chaetognatha.... 'lhe analysis 'Vtaa don-e from ·a. t.;ommuni ty ·viewpoint., that is., an objective technique was used. ·to· identify related g:r.oups of the Chaetognatha gnd the,se gn·ups were then eorr:elate.d with the distritmti~on, abtmd.ettu-:e and feclll'ldity of' the i:ndtv.iduu species and wi tb. the existing hjrtirogra.phic;al :conditi·dns. Oompet.i ti:\Te re'lationsh:ip~ amol'lg the specie...

Assessment Of Heavy Metal Residues In Water, Fish Tissue And Human Blood From Ubeji, Warri, Delta State, Nigeria

ABSTRACT: Residual levels of lead, chromium, cadmium and zinc in water and fish tissue from Ubeji River, Warri and blood samples from residents of Ubeji were analysed. Control water and fish samples were obtained from Eleyele River and blood from residents of Ibadan. All the samples collected were digested using a modified procedure from the Association of Official Analytical Chemists (AOAC) and were subsequently analyzed using Atomic Absorption Spectroscopy. Levels of lead and cadmium i...

Local depletion of two larger Duikers in the Oban Hills Region, Nigeria

Abstract Across West and Central Africa, duikers are important for trade and consumption; their populations are expected to become depleted. Reliable data on their status are scanty in Nigeria. We assessed duiker populations in the Oban Sector of Cross River National Park through diurnal and nocturnal surveys along 32 transects of 2 km each. After 508-km survey effort, only Ogilby’s duiker (Cephalophus ogilbyi) and blue duiker (Philantomba monticola) were recorded. Using habitat as ...

Rice Yield and Yield Components as Influenced by Phosphorus and Nitrogen Application Rates in the Moist Savanna of West Africa

Abstract: A two-year field experiment was conducted to evaluate the influence of nitrogen (0, 30, 60, and 120 kg N ha-1) and phosphorus (0, 30, and 60 kg P2O5 ha-1) application on grain yield and yield components of five New Rice for Africa (NERICA) cultivars, their parents, and a check on a degraded soil in the moist savanna of Nigeria. Nerica 14 recorded the highest grain yield of 1.3 mg ha-1compared to the other NERICA cultivars. It also produced significantly (P < 0.05) longer panicles (1...

Upland rice based intercropping system among farmers in selected villages in Ogun State in South west of Nigeria

Rapid Rural Appraisals (RRA) were conducted among one hundred and fifty five farmers in rice growing areas of Obafemi/Owode and Ifo Local Government Areas of Ogun State in South-West of Nigeria to investigate farmers’ practices of growing rice in rice/cassava intercropping system in 2007. The farmers in these villages cultivated 2 to 4 farms with an average farm size of about 2 ha. Results from the RRA showed that the farmers have been growing rice for over 21 years. About 31% of the farmer...

Pollen Analysis of Honey Bought from Sokoto Metropolis

ABSTRACT Microscopic&nbsp; examination&nbsp; of&nbsp; pollen&nbsp; grains&nbsp; determined&nbsp; the&nbsp; botanical&nbsp; origin&nbsp; and&nbsp; geographical&nbsp; location&nbsp; of&nbsp; honey.&nbsp; This study&nbsp; was&nbsp; aimed at&nbsp; determining&nbsp; the&nbsp; botanical&nbsp; sources&nbsp; of&nbsp; honey using&nbsp; qualitative&nbsp; and&nbsp; quantitative&nbsp; pollen&nbsp; analysis.&nbsp; Ten grams&nbsp; (10g)&nbsp; of&nbsp; honey&nbsp; was&nbsp; diluted&nbsp; with&nbsp; 8ml&nbsp...

Effect of cattails (tyha latifolia) invasion on species richness and soil properties.

Cattails (Typha latifolia) are noxious and invading species which are rapidly spread across water bodies. This study aims at determining the distribution and ecological effects of cattail on invaded ecosystems in Kwara State. Survey was made across the wetlands in the sixteen Local Government Areas in Kwara State. Out of these, wetlands of eight Local Government were selected due to the prevalence of cattails in them. Each location with cattail distribution was divided into three subplots whi...


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