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Registros recuperados: 103
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A Discriminant Analysis of Factors Associated with The Adoption Of Certified Organic Farming By Smallholder Farmers in Kwazulu-Natal, South Africa AgEcon
Kisaka-Lwayo, Maggie.
Discriminant analysis was used to identify the characteristics that distinguish between fully-certified organic, partially-certified organic and non-organic farmers in Umbumbulu district, KwaZulu-Natal (KZN), South Africa (SA) during October- November 2004. 200 farmers interviewed were drawn by purposively selecting the 151 members of the Ezemvelo Farmers’ Organisation (EFO), and by random sampling 49 non-organic farmers in wards neighbouring EFO. Results from the two estimated discriminant functions suggested that farmers with higher household sizes, incomes, input costs per hectare and number of chickens owned, locations further from innovators and less risk aversion were more likely to be certified as organic. Household location should be considered in...
Tipo: Conference Paper or Presentation Palavras-chave: Adoption; Organic; Discriminant Analysis; South Africa; Agricultural and Food Policy; Community/Rural/Urban Development; Demand and Price Analysis; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; International Relations/Trade; Labor and Human Capital; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008 URL: http://purl.umn.edu/52155
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A Dynamic Risk Optimization Model for Evaluating Profitable and Feasible Water Management Plans AgEcon
Grove, Bennie; Oosthuizen, L.K.; Backeberg, G.R..
Currently the South African government is advocating the cultivation of high valued crops and more efficient use of available water resources through the adoption o f more efficient irrigation technology and irrigation scheduling. A requirement of the National Water Act (Act 36 of 1998) is the compilation of water management plans. The main objective of this paper is to develop a multiperiod mathematical risk programming model able of assisting water user associations with the compilation of water management plans that are both profitable and feasible. Special care was taken to represent canal capacities and irrigation system application rates in the model. Risk simulation procedures are used to generate an appropriately correlated inter- and...
Tipo: Conference Paper or Presentation Palavras-chave: Dynamic Linear Programming; Risk; Irrigation; Feasibility; South Africa; Resource /Energy Economics and Policy; C6; Q15; Q12.
Ano: 2006 URL: http://purl.umn.edu/25554
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A Lagrangian analysis of the Indian-Atlantic interocean exchange in a regional model - art. no. L14611 ArchiMer
Doglioli, Andrea; Veneziani, M; Blanke, Bruno; Speich, Sabrina; Griffa, A.
We present a new numerical Lagrangian technique based on the coupling of transport computation with spin analysis of trajectories. This method was applied to results from a high-resolution numerical model of the oceanic region around South Africa. We estimated an Indian-Atlantic leakage of about 14 Sv. In the western Cape Basin, approximately 30% of this transport is due to trapping eddies with a ratio between cyclones and anticyclones transport of 1.3. These findings are briefly discussed with respect to recent observations of the highly nonlinear regime found in this area of the Cape Basin.
Tipo: Text Palavras-chave: Anticyclones transport; Cyclones transport; The Indian Atlantic interocean exchange; South Africa; Numerical model.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1847.pdf
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A MODEL OF THE ECONOMIC IMPACT OF AFRICAN HORSE SICKNESS TO THE EQUINE BREEDING INDUSTRY IN SOUTH AFRICA AgEcon
Brooks, Laura.
A deterministic model for the economic impact of African Horse Sickness (AHS) on the equine breeding industry was developed for South Africa. It was applied to the case of the 2007/2008 outbreak of AHS in the Eastern Cape as a pilot application of the model, using data from breeders in the province. It was concluded that the deterministic model’s extension to include other areas of equine livelihoods could be effective in exposing the need for further research into the control and treatment of AHS in South Africa.
Tipo: Report Palavras-chave: African horse sickness; Economic impact; South Africa; Environmental Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/107456
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A new leafminer on grapevine and Rhoicissus (Vitaceae) in South Africa within an expanded generic concept of Holocacista (Insecta, Lepidoptera, Heliozelidae) Naturalis
Nieukerken, E.J. van; Geertsema, H..
A grapevine leafminer found recently in table grape orchards and vineyards in the Paarl region (Western Cape, South Africa) is described as Holocacista capensis sp. n. It has also been found on native Rhoicissus digitata and bred on that species in the laboratory. It is closely related to Holocacista salutans (Meyrick, 1921), comb. n. (from Antispila), described from Durban in KwaZulu-Natal, but widespread in southern Africa and a native leafminer of various Vitaceae: Rhoicissus tomentosa, R. digitata, R. tridentata and Cissus cornifolia. Holocacista capensis has been found on Vitis vinifera both in Gauteng and Western Cape, the earliest record being from 1950 in Pretoria. The initial host shift from native Vitaceae to Vitis must have occurred much...
Tipo: Article / Letter to the editor Palavras-chave: Host shift; Leafminers; Vitaceae; Viticulture; Table grapes; Rhoicissus; Cissus; DNA barcode; Genitalia; Holocacista; Antispilina; Antispila; Afrotropics; South Africa; Zimbabwe; India.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/648754
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A new methodology for assessing the impact of water-pricing scenarios: case study of small-scale irrigation schemes in South Africa AgEcon
Speelman, Stijn; Frija, Aymen; Farolfi, Stefano; Buysse, Jeroen; D'Haese, Marijke F.C.; D'Haese, Luc.
Worldwide growing water scarcity has increased the call for economic instruments to stimulate rational water use in agriculture. In addition cost-recovery is now widely accepted as a cornerstone of sustainable water management. As a consequence now in developing countries, where currently agricultural water use is often still heavily subsidized, a tendency exists of introducing water-pricing as a policy to achieve more sustainable water use. The exact impact of water pricing policies on irrigation water use or on the farmers’ production system is however mostly unknown. A new two-stage methodology that allows estimating at the farm level the effects of introducing or raising a water price on the agricultural production process and water demand is...
Tipo: Conference Paper or Presentation Palavras-chave: Water-pricing; Water savings; Irrigation; Data envelopment analysis; South Africa; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/43836
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A new Themonocoris from South Africa (Hemiptera: Heteroptera: Reduviidae: Phymatinae: Themonocorini) Naturalis
Doesburg, P.H. van; Jacobs, D.H..
Themonocoris endroedyi spec. nov. from eastern Transvaal is described and illustrated, and its biology discussed. A key to the species of Themonocoris and a distribution map are provided.
Tipo: Article / Letter to the editor Palavras-chave: Insecta; Heteroptera; Reduviidae; Phymatinae; Themonocorini; New species; Key; Biology; South Africa; 42.75.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/376600
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A review of the endemic southern African soft coral genus Pieterfaurea Verseveldt & Bayer, 1988 (Octocorallia: Nidaliidae), with descriptions of three new species Naturalis
Williams, G.C..
The soft coral genus Pieterfaurea Verseveldt & Bayer, 1988, endemic to the south and east coasts of South Africa, is reviewed. Five species are recognized as valid, including three new species described here as new. A dichotomous key and a table of comparative characters are included to aid in the differentiation of the five taxa.
Tipo: Article / Letter to the editor Palavras-chave: Coelenterata; Anthozoa; Octocorallia; Nidaliidae; Pieterfaurea; Soft corals; Endemic genus; South Africa; Three new species; Southwestern Indian Ocean; 42.72.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/215737
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Addressing Trade-offs: Experiences from Conservation and Development Initiatives in the Mkuze Wetlands, South Africa Ecology and Society
Dahlberg, Annika C.; Department of Physical Geography and Quaternary Geology, Stockholm University; annika.dahlberg@natgeo.su.se; Burlando, Catie; Natural Resources Institute, University of Manitoba; umburlac@cc.umanitoba.ca.
Present-day conservation policies generally include the aim to integrate biodiversity conservation and local development, and describe this as a win–win solution that can satisfy all interests. This is challenged by research claiming that many efforts fail to match practice to rhetoric. South Africa has made strong commitments to fulfill the dual goals of conservation and development, and the iSimangaliso Wetland Park is promoted as an example of this. We explore present and potential outcomes of conservation and development interventions in a community bordering the Wetland Park through the perspective of different stakeholders, with the aim of uncovering opportunities and risks. In terms of improving local livelihoods as well as involvement in...
Tipo: Peer-Reviewed Reports Palavras-chave: Integrated conservation and development; Mkuze wetlands; Natural resource management; Protected area; Rural livelihoods; South Africa; Trade-offs.
Ano: 2009
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After the negotiations: assessing the impact of free trade agreements in Southern Africa AgEcon
Lewis, Jeffrey D.; Robinson, Sherman; Thierfelder, Karen.
"September 1999." "MERRISA, Macro Economic Reforms and Regional Integration in Southern Africa"--Series t.p. Includes bibliographical references (p. 26-28). Published as: Lewis, Jeffrey D.; Robinson, Sherman; Thierfelder, Karen. 2003. Free trade agreements and the SADC economies. Journal of African Economies 12(2): 156-206.
Tipo: Working or Discussion Paper Palavras-chave: Trade policy -- Africa.; Free trade.; South Africa; International Relations/Trade.
Ano: 1999 URL: http://purl.umn.edu/97532
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Agricultural cooperatives II: Can they facilitate access of small-scale farmers in South Africa to input and product markets? AgEcon
Ortmann, Gerald F.; King, Robert P..
The objective of this research is to investigate whether agricultural cooperatives can facilitate smallholder farmer access to input and product markets. Farmers in two case study communal areas of KwaZulu-Natal face high transaction costs as reflected primarily in their low levels of education and literacy, lack of market information, insecure property rights, poor road and communication infrastructure, and long distances to markets. Analysis of the reasons why cooperatives were originally established in various parts of the world suggests that most of the causes (such as poverty, market failure and high transaction costs) also apply to the study farmers, as do the seven international principles of cooperation. Smallholder farmers in both case study...
Tipo: Journal Article Palavras-chave: Agricultural cooperatives; Small-scale farmers; High-value crops; Transaction costs; South Africa; Agribusiness.
Ano: 2007 URL: http://purl.umn.edu/10124
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Agricultural land tax and farm-level resource use and output supply response AgEcon
Olubode-Awosola, Femi.
This study develops and uses a programming model for farm-level resource use and output supply response to estimate the effects of agricultural land tax in South Africa: A case study of Free State, a region of extremely large commercial farms that gained their size and economic heft during the apartheid years of aggressive subsidies, favorable tax treatment, lucrative state grants and gifts, and all manner of financial assistance. The results indicate that changes in land use and output supply are marginal. The highest effects are observed on irrigated farming. Relevant policy responses raised by the findings are discussed.
Tipo: Conference Paper or Presentation Palavras-chave: Agricultural land tax; Farm-level; Resource use; Output supply; Land reform; South Africa; Case study; Programming model; Agricultural and Food Policy; Farm Management; Food Security and Poverty; Land Economics/Use; Political Economy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2009 URL: http://purl.umn.edu/51664
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Agulhas eddy fluxes in a 1/6 degrees Atlantic model ArchiMer
Treguier, Anne-marie; Boebel, O; Barnier, B; Madec, G.
A 1/6degrees resolution primitive equation model of the Atlantic circulation is analyzed in the Agulhas region. The model has a realistic level of eddy kinetic energy, and produces anticyclonic Agulhas rings as well as cyclonic structures. In the model as well as in the data, ring trajectories undergo a transition between a turbulent character in the Cape Basin and a steady propagation in the rest of the South Atlantic. The topography of the Walvis Ridge does not seem to play a part in generating this contrast in the model. The model shows that cyclones are primarily generated from the negative shear vorticity side of the Agulhas Current as it leaves the coast, and they are most of the time paired with anticyclones in dipolar or tripolar structures....
Tipo: Text Palavras-chave: South Africa; South Atlantic Ocean; Numerical model; Ocean currents; Oceanic eddies; Eddy flux.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-453.pdf
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An assessment of small-scale users’ inclusion in large-scale water user associations of South Africa AgEcon
Faysse, Nicolas.
Tipo: Report Palavras-chave: Farmers’ associations; Water users’ associations; Water resource management; Irrigation management; Catchment areas; Legislation; Legal aspects; Water allocation; Farmer participation; Decision making; Case studies; South Africa; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Financial Economics; Institutional and Behavioral Economics; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/52969
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Application of crude and recombinant ELISAs and immunochromatographic test for serodiagnosis of animal trypanosomosis in the Umkhanyakude district of KwaZulu-Natal province, South Africa OAK
NGUYEN, Thu-Thuy; MOTSIRI, Mono Sophie; TAIOE, Moeti Oriel; MTSHALI, Moses Sibusiso; GOTO, Yasuyuki; KAWAZU, Shin-Ichiro; Molifi THEKISOE, Oriel Matlhahane; INOUE, Noboru; 河津, 信一郎; 井上, 昇.
A total of 231 serum samples were collected from sheep (n=9), goats (n=99) and cattle (n=123) in northeastern KwaZulu-Natal, South Africa. Trypanosome infection was detected using Trypanosoma brucei brucei crude antigen (TbbCA) and T. congolense crude antigen (TcoCA) ELISA assays. Recombinant antigen (T. evansi GM6 which consisted of 4 repeat domains, TeGM6-4r) ELISA and immunochromatographic test (ICT) were also used. Crude antigen ELISA, TeGM6-4r-ELISA and ICT detected 27.3%, 29% and 19.9% of trypanosome seropositive samples, respectively. Trypanosome infection prevalence in cattle and goats was 35.8–46.3% and 0–9.1%, respectively. Out of 9 sheep serum samples, 2–4 sera (22.2–44.4%) were positive. The detection performance of crude and recombinant...
Palavras-chave: Animal African trypanosomosis; ELISA; Immunochromatographic test; Serodiagnosis; South Africa.
Ano: 2015 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4034
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Applying the Concept of Fit to Water Governance Reforms in South Africa Ecology and Society
Tipo: Peer-Reviewed Reports Palavras-chave: Boundaries; Dynamic fit; River basin management; South Africa; Spatial fit; Water governance; Water resource management.
Ano: 2014
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Best fit model selection for spatial differences (regression) in the profitability analysis of precision phosphate (P) application to winter cereals in Precision Agriculture (PA) AgEcon
Hough, Ella Christina; Nell, Wilhelm T.; Maine, Ntsikane; Groenewald, Jan A.; van der Rijst, M..
Phosphates (P) are an important nutrient required by every living plant and animal cell, and deficiencies in soils could cause limited crop production, thereby reducing profitability. Phosphates are also a primary nutrient essential for root development and crop production, and are needed in the tissues of a plant where cells rapidly divide and enlarge. Precision agriculture (PA) could assist the farmer in applying the correct amount of P to the part of the field where it is required most. Variable rate technology (VRT) is a potential tool that can help with the development of strategies for phosphate fertilizer management. On-field trials were conducted on a commercial farm in the Western Cape Province; As many as five soil types occur on each field...
Tipo: Journal Article Palavras-chave: Precision agriculture; Variable-rate phosphate application; Single rate phosphate application; Profitability; Spatial differences; Restricted maximum-likelihood model (RELM); Spatial regression; Best fit model selection; South Africa; Crop Production/Industries.
Ano: 2010 URL: http://purl.umn.edu/96642
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Biodiversity on the marginal coral reefs of South Africa: What does the future hold? Naturalis
Schleyer, M.H.; Celliers, L..
Southern African coral communities form a continuum from the more typical, accretive reefs in the tropics of Mozambique to the marginal, southernmost African distribution of this fauna in KwaZulu- Natal. While the latter are limited in size, they are gaining increasing attention as they provide a model for the study of many of the stresses to which these valuable systems are globally being subjected. Soft coral cover, comprising relatively few species, exceeds that of scleractinians over much of the southern reefs, and the coral communities attain a high biodiversity at this latitude on the East African coast. A long-term monitoring programme has revealed small yet significant changes in community structure on the reefs in recent years, concurrent with...
Tipo: Article / Letter to the editor Palavras-chave: Biodiversity; Coral reefs; South Africa; 42.79.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/220567
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Bobekoides gen. nov. (Hymenoptera: Braconidae: Alysiinae) from South Africa Naturalis
Achterberg, C. van.
A new genus of the subfamily Alysiinae (Braconidae) is reported from South Africa (Bobekoides gen. nov.; type species: Bobekoides fulvus spec. nov.), illustrated, and described. A key to the species is added. The new genus is closely related to the East Palaearctic genus Hylcalosia Fischer, 1967.
Tipo: Article / Letter to the editor Palavras-chave: Hymenoptera; Braconidae; Alysiinae; Alysiini; Bobekoides; Afrotropical; South Africa; Key; 42.75.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/215080
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Can Bt Maize Reduce Exposure to the Mycotoxin Fumonisin in South Africa? AgEcon
Pray, Carl E.; Rheeder, John; Gouse, Marnus; Volkwyn, Yvette; van der Westhuizen, Liana; Shephard, Gordon.
The mycotoxin fumonisin is associated with oesophageal cancer and birth defects. The Eastern Cape province of South Africa has high levels of fumonisin in maize and oesophageal cancer. This study measures the amounts of the mycotoxin fumonisin in the grain of Bt maize, commercial hybrids, and farmer-saved, local mixtures of seed that were produced and stored by small holders in South Africa. We find that adoption of Bt maize can reduce poor rural consumers exposure to fumonisin. Greater consumption of maize meal milled in modern mills could have a similar impact.
Tipo: Conference Paper or Presentation Palavras-chave: Bt maize; Mycotoxins; Fumonisin; South Africa; Agricultural and Food Policy; Health Economics and Policy; International Development.
Ano: 2009 URL: http://purl.umn.edu/51739
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