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	Provedor de dados AgEcon (2) Autor Hough, Ella Christina (2) Nell, Wilhelm T. (2) Groenewald, Jan A. (1) Maine, Ntsikane (1) van der Rijst, M. (1) Palavra-chave Crop Production/Industries (2) Best fit model selection (1) Precision agriculture (1) Profitability (1) Restricted maximum-likelihood model (RELM) (1) Single rate phosphate application (1) South Africa (1) Spatial differences (1) Spatial regression (1) Variable-rate phosphate application (1) Mais... Tipo do documento Conference Paper or Presentation (1) Journal Article (1) Ano 2010 (1) 2003 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última 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 The Financial Aspect of Growing Organic Wine Grapes in the Vredendal District AgEcon Hough, Ella Christina; Nell, Wilhelm T.. Confusion still exists regarding the meaning of the organic production system. It can be defined as a holistic production system which enhances the agricultural eco-system by prohibiting the use of synthetic production mediums. It focuses on the improvement of soil fertility and the protection of the environment. The environmental advantages by themselves are not reason enough for farmers to adopt organic practices. The financial implication of organic agriculture in comparison with conventional practices is very important. It does not matter how ecologically advantegeous organic farming is, if a farming system does not show sufficient profit for the farmer to stay in business in a free market, an organic system will not be adopted. Ecological agriculture... Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries. Ano: 2003 URL: http://purl.umn.edu/24306 Registros recuperados: 2 Primeira ... 1 ... Última

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