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	Provedor de dados 31 (3) Autor English, Burton C. (3) Roberts, Roland K. (3) Mahajanashetti, S.B. (2) Cochran, Rebecca L. (1) Larkin, Sherry L. (1) Larson, James A. (1) Marra, Michele C. (1) Martin, Steven W. (1) Perruso, Larry (1) Mais... Palavra-chave Site-specific farming (3) Precision farming (2) Resource /Energy Economics and Policy (2) Spatial variability (2) C25 (1) Corn (1) Crop growth simulation model (1) EPIC (1) Environmental Economics and Policy (1) Land Economics/Use (1) Meta-response functions (1) Nitrogen (1) Nitrogen restriction (1) Precision agriculture (1) Profit function (1) Q12 (1) Q24 (1) Rainfall (1) Research and Development/Tech Change/Emerging Technologies (1) Variable rate application (1) Mais... Tipo do documento Conference Paper or Presentation (2) Journal Article (1) Ano 2005 (1) 1999 (2) País United States (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última SPATIAL BREAK-EVEN VARIABILITY FOR CUSTOM HIRE VARIABLE RATE TECHNOLOGY ADOPTION 31 Mahajanashetti, S.B.; English, Burton C.; Roberts, Roland K.. A theoretical model identified ranges of spatial variability required within multiple-land-class fields for economically viable variable rate technology (VRT) and the spatial variability required for maximum return to VRT. An example illustrated that return to VRT and the viable range of spatial variability increased for higher corn and nitrogen prices. Tipo: Conference Paper or Presentation Palavras-chave: Precision farming; Site-specific farming; Nitrogen; Corn; Spatial variability; Yield variability; Profit function; Land Economics/Use; Resource /Energy Economics and Policy. Ano: 1999 URL: http://purl.umn.edu/21676 ECONOMIC AND ENVIRONMENTAL BENEFITS OF VARIABLE RATE APPLICATION OF NITROGEN TO CORN FIELDS: ROLE OF VARIABILITY AND WEATHER 31 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 Factors Affecting Perceived Improvements in Environmental Quality from Precision Farming 31 Larkin, Sherry L.; Perruso, Larry; Marra, Michele C.; Roberts, Roland K.; English, Burton C.; Larson, James A.; Cochran, Rebecca L.; Martin, Steven W.. This study identified the factors that influenced whether farmers in the Southeastern United States perceived an improvement in environmental quality from adopting precision farming technologies (PFTs). Farmers with larger farms or higher yields were more likely to believe that they observed positive externalities associated with PFTs. Farmers who found PFTs profitable or who believed input reduction was important had higher probabilities whereas those with higher incomes or who were more dependent on farm income were less likely to perceive such benefits. Interestingly, the importance of environmental quality and length of time using PFTs were not found to affect the probability of perceiving an improvement in environmental quality. Tipo: Journal Article Palavras-chave: Precision agriculture; Site-specific farming; Variable rate application; C25; Q12; Q24. Ano: 2005 URL: http://purl.umn.edu/42787 Registros recuperados: 3 Primeira ... 1 ... Última

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