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	Provedor de dados AgEcon (2) Autor Armour, R.J. (2) Viljoen, Machiel F. (2) Palavra-chave Crop Production/Industries (1) Farm Management (1) GAMS (1) Irrigation (1) Land Economics/Use (1) Leaching (1) Linear programming (1) Non-point source pollution (1) On-farm storage (1) Resource /Energy Economics and Policy (1) Return flows (1) SALMOD (1) Salinisation (1) Water quality (1) Mais... Tipo do documento Conference Paper or Presentation (1) Journal Article (1) Ano 2002 (1) 2000 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última SALMOD, a Salinity Management Tool for Irrigated Agriculture AgEcon Armour, R.J.; Viljoen, Machiel F.. This paper presents an irrigation farm management tool, SALMOD (Salinity And Leaching Model for Optimal irrigation Development), that calculates the profit maximizing crop enterprise composition and irrigation management options for farm specific soil type, drainage status and irrigation system composition subject to various regional control measures and expected irrigation water salinities. After stating the water quality problem, and particularly salinisation in Southern Africa, the input data requirements and the results of SALMOD and their usefulness at farm level, are discussed. The impact of various possible regional or policy regulations are then discussed. SALMOD was developed for irrigators in the lower Vaal and Riet Rivers in South Africa. These... Tipo: Conference Paper or Presentation Palavras-chave: Irrigation; Water quality; Return flows; Salinisation; Leaching; Non-point source pollution; On-farm storage; SALMOD; Linear programming; GAMS; Farm Management; Land Economics/Use. Ano: 2002 URL: http://purl.umn.edu/7012 Towards Quantifying The Economic Effects Of Poor And Fluctuating Water Quality On Irrigation Agriculture: A Case Study Of The Lower Vaal And Riet Rivers AgEcon Armour, R.J.; Viljoen, Machiel F.. Irrigation farmers in the lower reaches of the Vaal and Riet Rivers are experiencing substantial yield reductions in certain crops and more profitable crops have been withdrawn from production, hypothesised, as a result of generally poor but especially fluctuating water quality. In this paper secondary data is used in a linear programming model to test this hypothesis by calculating the potential loss in farm level optimal returns. The model is static with a time frame of two production seasons. Linear crop-water quality production functions (Ayers & Westcot, 1983; adapted from Maas & Hoffmann, 1977) are used to calculate net returns for the eight most common crops grown. Results show optimal enterprise composition under various water quality... Tipo: Journal Article Palavras-chave: Crop Production/Industries; Resource /Energy Economics and Policy. Ano: 2000 URL: http://purl.umn.edu/56171 Registros recuperados: 2 Primeira ... 1 ... Última

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