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	Provedor de dados AgEcon (2) Autor English, Burton C. (2) Mahajanashetti, S.B. (2) Roberts, Roland K. (2) Larson, James A. (1) Tyler, Donald D. (1) Palavra-chave Meta-response functions (2) Nitrogen restriction (2) Precision farming (2) Spatial variability (2) Corn (1) Crop Production/Industries (1) Crop growth simulation model (1) EPIC (1) Environment (1) Environmental Economics and Policy (1) Rainfall (1) Research and Development/Tech Change/Emerging Technologies (1) Resource /Energy Economics and Policy (1) Site-specific farming (1) Site-specific management (1) Weather variability (1) Mais... Tipo do documento Conference Paper or Presentation (1) Journal Article (1) Ano 2002 (1) 1999 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última VARIABLE RATE NITROGEN APPLICATION ON CORN FIELDS: THE ROLE OF SPATIAL VARIABILITY AND WEATHER AgEcon Roberts, Roland K.; Mahajanashetti, S.B.; English, Burton C.; Larson, James A.; Tyler, Donald D.. Meta-response functions for corn yields and nitrogen losses were estimated from EPIC-generated data for three soil types and three weather scenarios. These metamodels were used to evaluate variable rate (VRT) versus uniform rate (URT) nitrogen application technologies for alternative weather scenarios and policy option. Except under very dry conditions, returns per acre for VRT were higher than for URT and the economic advantage of VRT increased as realized rainfall decreased from expected average rainfall. Nitrogen losses to the environment from VRT were lower for all situation examined, except on fields with little spatial variability. Tipo: Journal Article Palavras-chave: Corn; Environment; Meta-response functions; Nitrogen restriction; Precision farming; Site-specific management; Spatial variability; Weather variability; Crop Production/Industries. Ano: 2002 URL: http://purl.umn.edu/15512 ECONOMIC AND ENVIRONMENTAL BENEFITS OF VARIABLE RATE APPLICATION OF NITROGEN TO CORN FIELDS: ROLE OF VARIABILITY AND WEATHER AgEcon English, Burton C.; Mahajanashetti, S.B.; Roberts, Roland K.. The use of meta-response functions based on EPIC-generated data resulted in comparisons between variable (VRAT) and uniform rate application technologies for 36 simulated fields. VRAT was more profitable and less nitrogen was lost to the environment in most cases. When spatial variability was small, uniform rate application techniques were adopted. However, when nitrogen use is restricted, VRAT is used on all simulated fields. Tipo: Conference Paper or Presentation Palavras-chave: Precision farming; Site-specific farming; Spatial variability; Nitrogen restriction; Rainfall; EPIC; Crop growth simulation model; Meta-response functions; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy. Ano: 1999 URL: http://purl.umn.edu/21533 Registros recuperados: 2 Primeira ... 1 ... Última

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