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Performance of Medicago sativa under dryland conditions on the eastern Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N F G Rethman --- Department of Plant Production, J J Odendaal --- Department of Agriculture & Water Supply, Transvaal Region, C C De Witt --- Department of Agriculture & Water Supply, Transvaal Region,Increased livestock numbers and improved animal performance based on dryland lucerne pastures requiring little or no nitrogenous fertilizer have been demonstrated to be feasible on the eastern Highveld. With large scale planting of lucerne‐based pasture (25% of arable land) 350... -
Effek van bewerking op die organiese materiaalinhoud van geselekteerde droëlandgronde in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. du Toit --- , Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-Afrika M. Hensley --- , Republiek van Suid-Afrika A. T.P. Bennie --- Departement van Grondkunde, Republiek van Suid-AfrikaDie doel van die ondersoek was om (1) die effek van bewerking op die organiese materiaalinhoud van gronde te kwantifiseer indien onversteurde gronde as verwysing dien; (2) die verband tussen bewerkingstyd en die afname in organiese materiaal te kry en... -
Effect of cultivation on the nitrogen fertility of selected dryland soils in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. du Toit --- , Republic of South Africa C.C. du Preez --- Department of Soil Science, Republic of South AfricaThis study is part of an investigation into the effect of cultivation on the organic matter content of topsoils (0 - 200 mm) from commercial farms practising dryland agriculture in the summer rainfall area of South Africa (24°-30°S; 24°-30°E). The... -
Changes in the organic matter and nutrient contents of some South African irrigated soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, Republic of South Africa G.H. Wiltshire --- Department of Soil Science, Republic of South AfricaCultivation caused, without exception, a decline in the organic matter content of dryland soils in the central regions of South Africa. The question arose as to how cultivation affects the organic matter content of irrigated soils from these regions. The... -
Ecosystem carbon storage under different land uses in three semi-arid shrublands and a mesic grassland in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. Mills --- Department of Soil Science, South Africa T.G. O'Connor --- Centre for African Ecology, South Africa J.S. Donaldson --- , South Africa M.V. Fey --- Department of Soil Science, South Africa A.L. Skowno --- , South Africa A.M. Sigwela --- Terrestrial Ecology Research Unit, Departments of Botany & Zoology, South Africa R.G. Lechmere-Oertel --- Terrestrial Ecology Research Unit, Departments of Botany & Zoology, South Africa J.D. Bosenberg --- , South AfricaCarbon (C) storage in biomass and soils is a function of climate, vegetation type, soil type and land management. Carbon storage was examined in intact indigenous vegetation and under different land uses in thicket (250–400 mm mean annual precipitation), xeric... -
Relationships between plant and soil nutrient status and position in the landscape on Pellic Vertisols of Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lemma Gizachew --- , Ethiopia G.N. Smit --- Department of Animal, Wildlife and Grassland Sciences, South AfricaEffects of land use on soil nutrients and related soil parameters of Pellic Vertisols were assessed using soil samples collected from plots subjected to the cultivation of tef (Eragrostis tef) (TF) and grass pea (Lathyrus sativus) (GP) and native grassland... -
MASS CULTURE OF
MICROCYSTIS UNDER STERILE CONDITIONSItem type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Botany Department, J.N. Eloff --- Botany Department,The design and use of a 601 all-glass culture system for the mass production of Microcystis (or other unicellular algae) under sterile conditions, are described. Bleaching and lysis of the cells could be prevented by controlling the pH and CO2... -
Harvesting, processing and utilisation of rattan canes in Western Nigeria
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E. Babajide Lucas --- Department of Agricultural Engineering, Nigeria Bamidele I.O. Dahunsi --- Department of Civil Engineering, NigeriaField trips were undertaken as a preliminary exercise, to identify the available rattan species in Western Nigeria and to estimate the quantities available. Information relating to their end-uses was collected from cane furniture makers and other rattan cane users through... -
Restoring bare patches in the Nama-Karoo of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: N Visser C Morris MB Hardy JC BothaOften veld degrades to a point beyond which vegetation cover, plant density and species composition do not recover despite the removal of the grazing impact. In such cases restoration interventions become necessary to assist with the re-establishment of vegetation. The... -
Assessing the effects of early silvicultural management on long-term site productivity of fast-growing eucalypt plantations: the Brazilian experience
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JLM Gonçalves JL Stape J-P Laclau J-P Bouillet J RangerEucalyptus is the dominant and most productive planted forest in Brazil, covering around 3.4 million ha for the production of charcoal, pulp, sawtimber, timber plates, wood foils, plywood and for building purposes. At the early establishment of the forest plantations,... -
The effects of conservation tillage practices and fertiliser management on soil structural properties at an experimental farm
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Danie Beukes --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Corrie Swanepoel --- Agricultural Research Council–Institute for Soil, Climate and Water, South AfricaCrop rotation and reduced tillage under conservation agriculture (CA) practices may induce higher soil organic carbon (SOC) and nitrogen (N) levels compared with conventional (Con) tillage practices. Soil organic carbon may increase soil aggregate stability (AS). The study site was... -
Land use change and its drivers in Kurt Bahir wetland, north-western Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Shewit --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Minwyelet --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Tesfaye --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia T Lewoye --- Bahir Dar University, College of Agriculture and Environmental Sciences, Ethiopia M Ferehiwot --- Bahir Dar University, College of Agriculture and Environmental Sciences, EthiopiaThe effects of land-use change on ecosystem services in Kurt Bahir wetland were investigated during 2013 to 2014 using LANDSAT satellite images from 1973, 1986, 2002 and 2013 to identify and map changes in land-use classes over time. To understand... -
Soil fertility and growth of Eucalyptus grandis in Brazil under different residue management practices
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: JLM Gonçalves MCP Wichert JL Gava AV Masetto ArthurJ.C. Junior MIP Serrano SLM MelloSilvicultural operations such as soil preparation, logging residue management and application of fertilisers can influence soil fertility, and hence nutrient uptake and tree growth. This paper reports the effect of site management practices of minimum and intensive cultivation of the... -
The relationship between Nairobi adolescents’ media use and their sexual beliefs and attitudes
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Ann Neville Miller --- Nicholson School of Communication, USA William Kinnally --- Nicholson School of Communication, USA Hellen Maleche --- Communication Department, Kenya Nancy Achieng’ Booker --- Graduate School of Media and Communications, KenyaAdolescents in sub-Saharan Africa are at risk for contracting HIV. Although media campaigns have educated the population as a whole, few studies are available about the time sub-Saharan African youth spend listening to and viewing sexual messages via the entertainment... -
The impacts of past cultivation on the reptiles in a South African grassland
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Gavin P. R. Masterson --- University of the Witwatersrand, South Africa Bryan Maritz --- University of the Witwatersrand, South Africa Darian Mackay --- University of the Witwatersrand, South Africa GrahamJ. Alexander --- University of the Witwatersrand, South AfricaHabitat transfonnation is the primary anthropogenic threat to global biodiversity. Fragmentation of reptile populations following habitat transfonnation within a landscape can lead to the extirpation of species. We investigated the effects of land-use on the species richness and abundance of... -
Cultivation of honeybush (Cyclopia spp.) in neo-colonial and multispecies landscapes of South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Sthembile Ndwandwe --- University of Cape Town, South Africa Roderick Juba --- , South Africa Matthew Sephton --- , South AfricaThe indigenous wild plants of Southern Africa are intertwined with human cultures, histories and livelihoods. By focusing on commercial cultivation of a wild plant, honeybush (Cyclopia spp.), an indigenous plant that is endemic to parts of South Africa, we discuss... -
Local knowledge, utilisation and consumption of seaweed in coastal communities of southwestern Madagascar
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Rodine --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar A Rakotoarimanana --- University of Toamasina, Madagascar AB Ramamonjisoa --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar LN Ranivoarivelo --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar C Rakotomahazo --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar GBG Todinanahary --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar G Tsiresy --- University of Toamasina, ISTRCE [East Coast Regional Higher Institute of Technology], Madagascar H Jaonalison --- University of Liège, Belgium AL Nomenisoa --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar I Eeckhaut --- University of Mons, Belgium ME Remanevy --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar JS Obe --- , Madagascar R Rasolofonirina --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, Madagascar T Lavitra --- Institut Halieutique et des Sciences Marines (IH.SM), University of Toliara, MadagascarThis study explored the local knowledge, utilisation and consumption of seaweeds (lomotsy in Malagasy) among coastal communities in southwestern Madagascar. Primary data were collected in eight villages, through a survey questionnaire (with a total of 629 respondents) and daily focus...