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	Provedor de dados AgEcon (2) Autor English, Burton C. (2) Mahajanashetti, S.B. (2) Roberts, Roland K. (2) Palavra-chave Management zones (2) Nitrogen (2) Precision farming (2) Spatial break-even variability proportions (2) Yield response variability (2) Crop Production/Industries (1) Farm Management (1) Production economics (1) Site-specific management (1) Spatial variability (1) Variable rate applications (1) Variable rate technology (1) Mais... Tipo do documento Journal Article (2) Ano 2001 (1) 2000 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última ASSESSING SPATIAL BREAK-EVEN VARIABILITY IN FIELDS WITH TWO OR MORE MANAGEMENT ZONES AgEcon English, Burton C.; Mahajanashetti, S.B.; Roberts, Roland K.. Farmers are interested in knowing whether applying inputs at variable rates across a field is economically viable. The answer depends on the crop, the input, their prices, the cost of variable rate technology (VRT) versus uninform rate technology (URT), and the spatial and yield response variability within each field. Methods were investigated for determining the range of spatial variability over which the return to VRT covers its additional cost compared with URT in fields with multiple management zones. Models developed in this article, or variants thereof, could be used to help farmers make the VRT adoption decision. Tipo: Journal Article Palavras-chave: Management zones; Nitrogen; Precision farming; Site-specific management; Spatial break-even variability proportions; Spatial variability; Variable rate technology; Yield response variability; Farm Management. Ano: 2001 URL: http://purl.umn.edu/15450 EVALUATING THE RETURNS TO VARIABLE RATE NITROGEN APPLICATION AgEcon Roberts, Roland K.; English, Burton C.; Mahajanashetti, S.B.. Potential benefits of variable rate nitrogen application are illustrated and information needs identified. Lower costs of precision farming services, higher crop prices, and greater divergence in yield response potentials across management zones reduce the spatial variability required for profitable variable rate application. Information needs include identification and measurement of management zones within a field and estimation of management zone yield response functions, crop and input prices, and the cost of precision farming services. Tipo: Journal Article Palavras-chave: Production economics; Management zones; Nitrogen; Precision farming; Spatial break-even variability proportions; Variable rate applications; Yield response variability; Crop Production/Industries. Ano: 2000 URL: http://purl.umn.edu/15393 Registros recuperados: 2 Primeira ... 1 ... Última

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