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| Registros recuperados: 20 | |
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| van Zyl, Johan; Thirtle, Colin G.. |
| Some comments are required to put in perspective the results obtained by Ngwenya, Battese and Fleming (1997). In particular, it is necessary to examine their main conclusion that in 1988/89 there was a significant inverse relationship between the technical inefficiency of wheat farmers in the Eastern Free State and farm size, because this is in direct contrast with the findings of Van Zyl, Binswanger and Thirtle (1995) who used the same dataset. |
| Tipo: Report |
Palavras-chave: Crop Production/Industries. |
| Ano: 1998 |
URL: http://purl.umn.edu/56717 |
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| Poonyth, Daneswar; van Zyl, Johan; Meyer, Ferdinand H.. |
| In this study, an econometric model of the South African maize and sorghum sector is estimated. Using the developed model, a market outlook for the two major grain sectors – maize and sorghum - for 1999/00 to 2006/07, is generated under the specified assumptions. Results indicate that for both maize and sorghum, consumption will gradually increase over time. In spite of varying areas of maize and sorghum being harvested, total production will also gradually increase over time due to increases in particularly yields. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Marketing. |
| Ano: 2000 |
URL: http://purl.umn.edu/54221 |
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| Erasmus, Barend; van Jaarsveld, Albert; van Zyl, Johan; Vink, Nick. |
| This paper links two different methodologies to determine the effects of climate change on the Western Cape farm sector. First, it uses a general circulation model (GCM) to model future climate change in the Western Cape, particularly with respect to precipitation. Second, a sector mathematical programming model of the Western Cape farm sector is used to incorporate the predicted climate change, specifically rainfall, from the GCM to determine the effects on key variables of the regional farm economy. In summary, results indicate that future climate change will lead to lower precipitation, which implies that less water will be available to agriculture in the Western Cape. This will have a negative overall effect on the Western Cape farm economy. Both... |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/54217 |
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| Poonyth, Daneswar; van Zyl, Johan. |
| This paper evaluates the production structure of the South African agricultural sector for the period 1970-1998, using a translog function. The results show that the production structure is best represented by production technology that is Hicks-neutral and homothetic. This information is useful in evaluating the results of previous research on the structure of South African agricultural production, particularly relatively recent research on elasticities of substitution. In addition, it also provides the basis for meaningful future analysis of aspects related to the production structure of agriculture. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Livestock Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/54222 |
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| Jooste, Andre; van Zyl, Johan. |
| The Effective Protection Ratio (EPR) is used in this study as a measure of the impact of policy distortions on agricultural producers. The results of the EPR analysis show that in 1995, most of the interventions supporting agricultural production have disappeared, particularly if the production is aimed at the domestic market. This holds for basic grains and oilseeds, as well as other products such as potatoes, cotton and tobacco, across all regions. Beef cattle and sheep production is also not being favoured by support in any of the regions. On the contrary, a number of commodities are effectively being taxed. |
| Tipo: Journal Article |
Palavras-chave: Agricultural and Food Policy. |
| Ano: 1998 |
URL: http://purl.umn.edu/54900 |
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| McDonald, Scott; Kirsten, Johann F.; van Zyl, Johan. |
| In this paper the format of a Social Accounting Matrix (SAM) for use as a database for the Computable General Equilibrium (CGE) modelling of agricultural policy reform in South Africa is detailed. It is shown that the published South African SAMs impose limitations upon their suitability as databases for CGE models, but that they can be readily modified. An additional benefit of a SAM is its use as a framework for the specification of the behavioural relationships necessary to the development of a model. Finally, a Macro SAM for 1993 is reported and the proposed disaggregation of the agricultural sector is identified. |
| Tipo: Journal Article |
Palavras-chave: Agricultural and Food Policy. |
| Ano: 1997 |
URL: http://purl.umn.edu/54450 |
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| von Bach, Helmke J. Sartorius; Townsend, Rob F.; van Zyl, Johan. |
| A stochastic frontier production function is defined for panel data on maize producing regions of South Africa. Technical inefficiency effects are assumed to be a function of climatic conditions, time and the terms of trade facing maize producers. The model is derived using nine years of data for the six major maize production regions of South Africa. The results demonstrate how maize farmers have increased their efficiency in the face of a cost-squeeze. The increased efficiency seems to be driven by lower levels of intermediate input use when facing higher costs and uncertain weather conditions. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1998 |
URL: http://purl.umn.edu/54787 |
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| van Zyl, Johan; Townsend, Rob F.; Vink, Nick. |
| This paper attempts to estimate the effects of some of the changes in the marketing system on the Western Cape Province of South Africa, utilizing a regional linear programming model of the agricultural sector of the region. The model includes supply, demand and production risk, and simulates the present agricultural production structure well. Market and trade liberalisation have major impacts on the structure of Western Cape agriculture, particularly the grain and livestock sub-sectors, with only marginal and mostly insignificant effects on horticultural products. |
| Tipo: Journal Article |
Palavras-chave: International Relations/Trade; Marketing. |
| Ano: 1997 |
URL: http://purl.umn.edu/54439 |
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| Jayne, Thomas S.; Hajek, Milan; van Zyl, Johan. |
| The maize-oriented agricultural economies throughout Southern Africa are in fundamental transition. Increased recognition of the costs of historical controls on pricing and marketing already has led to partial maize market liberalization in several countries in the region. However, there is still intense debate over the appropriate scope and implementation of future food market reform. Much of the debate derives from uncertainty over the consequences of comprehensive and politically risky changes to domestic markets, especially at a time when regional market conditions are also in flux due to agricultural restructuring in neighboring countries. There is currently little information on the direction and magnitude of grain trade between South Africa,... |
| Tipo: Report |
Palavras-chave: Food security; Food policy; Maize market; Crop Production/Industries; Marketing; Q13. |
| Ano: 1995 |
URL: http://purl.umn.edu/54700 |
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| Townsend, Rob F.; van Zyl, Johan; Thirtle, Colin G.. |
| This paper focuses on assessing the benefits of research expenditures on maize production in South Africa. Both the production and supply function approaches are used to calculate elasticities of research expenditure on output and yield. Cointegration is used to establish long-run relationships between variables in these models. The lag structure of R&D expenditures on output is examined making use of the unrestricted, polynomial, beta and gamma distributions. The coefficients of these lag distributions were then used to calculate a rate of return to maize research expenditure, which was estimated as being between 28% and 39% per annum. These rates of return are high, mitigating in favour of more research expenditure rather than less. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1997 |
URL: http://purl.umn.edu/54718 |
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| van Schalkwyk, Herman D.; van Zyl, Johan; Botha, P.W.; Bayley, B.. |
| During the past year, there have been major policy reforms in Lesotho and South Africa with respect to maize pricing and marketing. In Lesotho the impact of deregulation on producers, consumers and government revenues was substantially lower than it should have been, and as a result Lesotho was not able to reap the full benefits of these changes. This is partly because information on the changes to the maize marketing system did not reach the potential beneficiaries of the new system. Free and easily accessible information is an essential element of a free market system. SACU countries must ensure the availability of information if they want to compete internationally. |
| Tipo: Journal Article |
Palavras-chave: Agricultural and Food Policy; Crop Production/Industries. |
| Ano: 1997 |
URL: http://purl.umn.edu/54723 |
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| Poonyth, Daneswar; van Zyl, Johan; Vink, Nick; Kirsten, Johann F.. |
| This paper evaluates the production structure of the South African agricultural sector for the period 1970-1998, using a translog function. The results show that the production structure is best represented by production technology that is Hicks-neutral and homothetic. This information is useful in evaluating the results of previous research on the structure of South African agricultural production, particularly relatively recent research on elasticities of substitution. In addition, it also provides the basis for meaningful future analysis of aspects related to the production structure of agriculture. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Industrial Organization. |
| Ano: 2001 |
URL: http://purl.umn.edu/18049 |
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| Kirsten, Johann F.; van Zyl, Johan. |
| South African agriculture is comprised of mainly two categories of farmers -- the subsistence farmers in the former homeland areas and the large-scale commercial (mainly white) farmers. This is in contrast with the situation in many other countries in the world where one would find a whole range of farm sizes, ranging from the very small or subsistence farmer to the very large farmer/agribusiness. The paper highlights the situation of small-scale farmers in an international context and compares it with the South African situation that is totally different. Within this context, this paper has as basic premise that in South Africa the concept of "small-scale farmer" is usually value-laden, creates wrong impressions and is often viewed in a negative light.... |
| Tipo: Journal Article |
Palavras-chave: Farm Management. |
| Ano: 1998 |
URL: http://purl.umn.edu/54898 |
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| van Zyl, Johan; Vink, Nick. |
| The farm sector of the Western Cape is modelled using a sector mathematical programming model to determine the effect of different water policies on output, prices, welfare and employment. Two scenarios are analysed, namely the effect of a restriction of water available for irrigation, and an increase in water tariffs. Results show a relative shift away from (intensive) irrigated production, and a decrease in producer welfare, especially for irrigation farmers, under both scenarios. When water availability is decreased, the negative effect falls disproportionately on the poor as employment decreases. In the long run the negative effects are severe, as there is a relative shift out of industries where the Western Cape has a competitive advantage. |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 1997 |
URL: http://purl.umn.edu/54717 |
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| Registros recuperados: 20 | |
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