Botany Research Papers/Topics

A I4C And ISN Study Of The Effects Of Ammonium Or Nitrate Nutrition On Carbon Allocation In Triticum Aestivum L. And • Zea Mays L.

ABSTRACT The poor response of some plant species, e.g. wheat, to ammonium nutrition has been attributed to a diversion of carbon allocation from structural material for root extension to functions associated with the assimilation and translocation of ammonium in the root. The aim of this research was to investigate carbon allocation in response to ammonium or nitrate nutrition in wheat, an ammonium intolerant species, and maize, which exhibits ammonium tolerance. Experiments were · carried ...

Vortices Of The Mozambique Ridge Current

Abstract The seed that eventually gave birth to this thesis was planted in August, 1975 when, during a cruise of the Research Vessel Meiring Naude the existence of deep-sea cyclonic vortices in the South Western Indian Ocean was discovered. Little was it realised during that small, fortuitous beginning in 1975 that the study would develop into the first detailed physical oceanographic investigation of the Mozambique Ridge and adjacent Mozambique Basin areas. It could also not be foreseen tha...

A Study Of The Effects Of Nitrate, Ammonium, And Nitrate + Ammonium Nutrition On Nitrogen Assimilation In Zeamays L.

Abstract. A brief review of the literature on the effects of nitrate and ammonium nitrogen sources on plant growth, and the assimilation of those nitrogen sources, has been presented. A water culture technique for the growth of maize was developed. The use of a gravel rooting medium with nutrients recycling through the rooting medium, and an iron supplement in the form of ferric citrate, resulted in superior growth of nitrate-fed plants in comparison to that observed with a hydroponic growth...

Plant traits and drought tolerance in the Savanna: A Kruger National Park case study

Abstract One of the central goals of plant ecology is to understand the factors that control the local distribution of plant species and thus the composition of communities. The aim of this study is to determine plant functional traits that can be associated with drought tolerance/avoidance and to test whether wood density is a good indicator of drought tolerance. The study was carried out in Kruger National Park in the month of June. A number of plant traits including wood density, leaf thic...

Physico-chemical factors influencing the spatial and temporal distribution of the seagrass. Zostera capensis. in Langebaan Lagoon

Abstract Seagrass meadows have important ecological roles in coastal ecosystems and provide high-value ecosystems services compared to other marine and terrestrial habitats. Despite this, there is growing evidence that this key ecosystems is declining on a global scale. Much of these declines have been attributed to the effects of human alterations of marine habitats. Continued destructive activities, in both South Africa and elsewhere, if not managed properly will result in the demise of sea...

Occurrence, Variability And Management Of Ralstonia Solanacearum In Potato Production Systems In Kenya

ABSTRACT Production of potato (Solanum tuberosum L.) in Kenya is constrained by many biotic, abiotic and socio-economic factors. Among the biotic constraints, bacterial wilt, caused by Ralstonia solanacearum (Yabuuchi et al., 1995) presents major management difficulties. Attempts to combat the disease have been difficult due to the complex heterogeneous genetic make-up of the pathogen, comprising different races and biovars, its survival mechanisms and its large number of hosts, including wee...

Antibacterial Activities of Daldina concentrica

ABSTRACT: Activities of the distilled water, ethanolic and chloroform extracts of Daldina concentrica an ascomycetous fungus was investigated on Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa, Bacillus cereus and Staphylococcus aureus) using agar well diffusion method. Ethanolic extract of Daldina concentrica showed significantly antibacterial activity against all the test microorganisms except Bacilllus cereus (P ≤0.05). Staphylococcus aureus was the most sensitive organism t...

Comparative Study of the Growth and Yield of Three Cultivated Pleurotus Species on Selected Tropical Trees Sawdusts

ABSTRACT The quest to boost dietary protein production from readily available and affordable sources is ever increasing in developing countries. The indigenous edible Pleurotus species (oyster mushrooms), which grow naturally on wood wastes, are potential protein supplements. However, little information is available on the usage of selected tropical trees for optimum mushroom cultivation. Therefore, this research was designed to investigate the growth and yield of oyster mushrooms on sawdust...

Cultivation And Molecular Characterisation Of Auricularia Species In Southwestern Nigeria

ABSTRACT Mushrooms such as Pleurotus, Vovariella and Auricularia species are cultivated for food and medicinal purposes in the world. However, cultivation of Auricularia in Nigeria is limited due to inadequate information on its characteristics, nutritional contents and cultivation requirements. Hence, this study was designed to characterise Auricularia species in Southwestern Nigeria and determine suitable substrates for their cultivation. Fifty-four samples of Auricularia species were ran...

Taxonomic Studies Of Lippia Javanica (Burm F.) Spreng. (Verbenaceae) Complex In East Africa Using Morphological And Molecular Characters And Evaluation Of Its Pesticidal Efficacy On Aphids

Abstract Lippia javanica (Burm. F.) Spreng occurs naturally in eastern, central and southern Africa. It has widely been used as herbal tea, for ethnomedicinal applications and as a botanical pesticide. Lippia javanica species exhibit great morphological and chemical variations which are notable across a number of natural populations. Differences in morphological taxonomy on important characters such as peduncle length and number of inflorescence per axil have been reported which has led to th...

Effects Of Management And Rainfall Simulation On Soil Respiration And Soil Carbon Store In A Moist Kenyan Savanna, Ruma Lambwe Valley

ABSTRACT The demand for agricultural land is driving the conversion of moist Kenyan savannah into agroecosystems (grazing fields and croplands) and together with altered rainfall patterns, is likely modifying soil moisture, soil respiration and carbon store in the ecosystem. Nevertheless, the carbon dynamics of moist savannas plus of the converted ecosystems are poorly understood yet planning for sustainable use of the ecosystem need to be based on scientific knowledge. While previous studie...

AN ETHNOBOTANICAL AND Phyrochemical. STUDY OF THE MEDICINAL PLANTS OF MAKUENI DISTRICT, Kenyael1

ABSTRACT Of all the uses of African plants, the aspect of medical use has probably attracted the most attention and has also been the most complex and varied. Nearly 70,000 species of higher plants have been used for medical purposes world wide. Medicinal plants form the key component to traditional medicine which remains the major source of health care for over 70% of the Kenyan population. Over 90% of the population use medicinal plants at one time or another. The increasing need to develop...

Evaluation Of Taro Leaf Blight (Phytophthora Colocasiae) Disease Incidence, Severity, Environmental Effects And Relationship Between Resistance And Agronomic Traits Of Selected Taro (Colocasi

ABSTRACT Taro (Colocasiae esculenta L. Schott) popularly known as ‘nduma’ is an aquatic plant grown for its edible leaves and corms. It is mainly cultivated in Western and Central Kenya but its production is constrained majorly by Phytophthora colocasiae, a taro leaf blight (TLB) disease. The disease causes destruction of leaf and corm. Knowledge pertaining to taro association with the disease incidence, severity, index, Rainfall, R.H, temperature, interrelationship between agronomic trai...

Potentials For Mycoremediation Of Petroleum Products By Fungi Isolated From Irvingia Gabonensis Seeds

ABSTRACT The Petroleum Industry has a huge potential for the pollution of the environment at every stage of its operation, hence the need to constantly fashion out new strategies for maintaining the sanctity of our environment. Fungi associated with diseased Irvingia gabonensis (Baill) seeds found in the open markets were suspected to possess the ability to degrade the hydrocarbon substances contained in these seeds. These fungi were isolated bimonthly from the diseased seeds of I.gabonensis...

Analysis Of Pyrethrum Plant Extract And Its Anti-Aphid Effect On Growth, Yields, Chlorophyll And Phytonutrient Contents Of African Nightshades

ABSTRACT African nightshades (Solanum scabrum) is one of indigenous vegetables widely consumed in Kenya. It is used for food, income and for medicinal purposes, but faces low yields due to severe damage by aphids. Yield losses due to aphids is estimated to about 84-96% in Kenya. Aphids have developed resistance to synthetic pesticides. There is need to search for ecofriendly alternatives such as the use of botanicals like pyrethrum which are cheaper. Pyrethrum extracts are known to control in...


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