Consulta: creatorFacets:"Oosthuizen,   L.K."
Registros recuperados: 7
Data/hora: 03/06/2024 16:46:14

’N EKONOMIESE EVALUERING VAN TEKORTBESPROEIING EN VERHOOGDE WATERTOEDIENINGSDOELTREFFENDHEID OP LANDBOUWATERGEBRUIK
Provedor de dados: 31
Autores: Grove,   Bennie; Oosthuizen,   L.K.
Deficit irrigation and increasing irrigation application efficiency were analysed as water-utilisation strategies through chance-constrained linear programming (CCLP) to establish whether these strategies were economically advantageous and water conserving. Deficit irrigation was modelled through scaling functions in the CCLP model, and potential return flow was calculated from optimal water application efficiencies. Results showed that increasing water application efficiency may be economically beneficial; however, the illusion might be created that water was conserved, while potential return flow was reduced. Deficit irrigation conserves water because water consumption decreases more than potential return flow. Deficit irrigation was economically...
Tipo: Journal Article
Palavras-chave: Resource /Energy Economics and Policy.
Ano: 1997
URL: http://purl.umn.edu/54716

THE EFFECT AND PERSISTENCE OF MAJOR CHANGES IN ECONOMIC POLICIES ON THE LONG-TERM PERFORMANCE (TREND) OF ETHIOPIAN AGRICULTURE
Provedor de dados: 31
Autores: Alemu,   Zerihun Gudeta; Oosthuizen,   L.K.; van Schalkwyk,   Herman D.
Agriculture in the Ethiopian economy has survived three major structural breaks, namely the 1974 change of policy in favour of a command-based economic system, the 1984 famine and the 1992 change of policy that introduced a market economy. A regression procedure was applied to analyze the effect of these breaks on the slope and intercept of agricultural GDP. In addition, statistical properties were studied to measure the degree of persistence of shocks in agricultural GDP. In the regression equation, only the 1984 famine was found to be significant. The non-significance of policy parameters in the regression equation could be associated with a lack of infrastructural facilities and the subsistence nature of Ethiopian agriculture. The study of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Political Economy; Productivity Analysis.
Ano: 2003
URL: http://purl.umn.edu/19089

AGRICULTURE AS A DRIVING FORCE OF ECONOMIC DEVELOPMENT: SUGGESTIONS FOR AGRICULTURAL DEVELOPMENT POLICY IN SOUTHERN AFRICA
Provedor de dados: 31
Autores: Oosthuizen,   L.K.
The purpose of the paper is to explain the process by which modernisation of the agricultural sector by introducing new production technology into the sector serves as driving force of general economic development, with the social rate of return on these investments being very high, while the benefits of the development will be widespread in the economy, and generally in favour of the poor. Furthermore policies are discussed with the aim of increasing productivity and per capita income of rural people in Southern Africa.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; International Development.
Ano: 1998
URL: http://purl.umn.edu/54881

A Dynamic Risk Optimization Model for Evaluating Profitable and Feasible Water Management Plans
Provedor de dados: 31
Autores: 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

QUANTIFYING ECONOMIC AND ENVIRONMENTAL TRADE-OFFS OF INSTREAM FLOW REQUIREMENTS: A COMPARISON BETWEEN STEWART-HAGAN AND STEWART CROP YIELD RELATIONSHIPS
Provedor de dados: 31
Autores: Grove,   Bennie; Oosthuizen,   L.K.
Chance constrained mathematical programming was used to compare the effects of two different crop yield relationships on the economic cost to irrigation farmers while maintaining an instream flow requirement. Results showed that the Stewart-Hagan programming model underestimated the economic cost and overestimated potential return flows. Water policies based on this model will lead to the implementation of socially unacceptable water allocation policies that may even apply more pressure on stream flows. Meaningful water policies could only be advanced by a thorough understanding of the economic and hydrological consequences of alternative water allocation policies through the integration of economic and hydrological models at catchment level.
Tipo: Journal Article
Palavras-chave: Crop Production/Industries; Environmental Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/54890

Impact of capital on the growth process of a sugarcane farm in Mpumalanga
Provedor de dados: 31
Autores: Haile,   B.O.; Grove,   Bennie; Oosthuizen,   L.K.
The research was conducted for a representative 50 ha farm in the Onderberg region in Mpumalanga province, where farmers use a combination of centre-pivot, drip, and dragline systems of different sizes to grow sugarcane. The main intention was to establish a multi-period linear programming model capable of economically evaluating a farm's expansion decision-making process for farmers faced with investment decisions in alternative irrigation systems, taking into account the available initial capital of the farm. A linear programming (LP) model was used to assign a mainline for a total of twelve irrigation system combinations based on the assumption that the farmer wishes to start with a 30 ha centre-pivot investment. The Generalized Algebraic Modelling...
Tipo: Journal Article
Palavras-chave: Agricultural Finance.
Ano: 2005
URL: http://purl.umn.edu/31705

IMPACT OF CAPITAL ON THE GROWTH PROCESS OF A SUGARCANE FARM IN MPUMALANGA
Provedor de dados: 31
Autores: Haile,   B.O.; Grove,   Bennie; Oosthuizen,   L.K.
The research was conducted for a representative 50 ha farm in the Onderberg region in Mpumalanga province, where farmers use a combination of centre-pivot, drip, and dragline systems of different sizes to grow sugarcane. The main intention was to establish a multi-period linear programming model capable of economically evaluating a farm expansion decision making process for farmers faced with investment decisions in alternative irrigation systems, taking in to account the available initial capital of the farm. A linear programming (LP) model was used to assign a mainline for a total of twelve irrigation system combinations based on the assumption that the farmer wishes to start with a 30 ha centre-pivot investment. Generalized Algebraic Modelling System...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19081