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	Provedor de dados AgEcon (5) Repositório Alice (3) Planta Daninha (1) Autor Akridge, Jay T. (2) CHAGAS, S. das (2) Cochran, Rebecca L. (2) English, Burton C. (2) FRANCHINI, J. C. (2) INAMASU, R. Y. (2) JORGE, L. A. de C. (2) LOPES, I. de O. N. (2) Larson, James A. (2) PIRES, A. (2) RABELLO, L. M. (2) Roberts, Roland K. (2) SCHEPERS, J. (2) SOUZA, J. L. R. de (2) SOUZA, M. de (2) SPERANZA, E. A. (2) VAZ, C. M. P. (2) Whipker, Linda D. (2) BERNARDI, A. C. C. (1) Basso,C.J. (1) Mais... Palavra-chave Variable rate application (9) Precision agriculture (4) Cotton (3) Agribusiness (2) Agricultura (2) Agriculture (2) Algodão (2) Crescimento de planta (2) Crop input dealer (2) Geographic information systems (GIS) (2) Imagem de satélite (2) NDVI Temporal Series (2) Normalized difference vegetation index (2) O30 (2) Plant growth (2) Plant growth control (2) Plant growth regulator (2) Q13 (2) Reguladores de crescimento de planta (2) Research and Development/Tech Change/Emerging Technologies (2) Mais... Tipo do documento Artigo de periódico (2) Conference Paper or Presentation (2) Working or Discussion Paper (2) Info:eu-repo/semantics/article (1) Journal Article (1) Parte de livro (1) Mais... Ano 2023 (2) 2014 (1) 2010 (2) 2009 (1) 2008 (1) 2005 (1) 2004 (1) Mais... País United States (5) Brazil (4) Idioma Inglês (8) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 9 Primeira ... 1 ... Última 2008 PRECISION AGRICULTURAL SERVICES DEALERSHIP SURVEY RESULTS AgEcon Whipker, Linda D.; Akridge, Jay T.. Precision technologies are now well-integrated into the agricultural industry – both at the farm level and at the crop input dealer level. No longer are crop input dealers only using the technologies to bring new services to their customers, they are also utilizing the technology in their own businesses to improve the efficiency and effectiveness of their operations. In early 2008, Crop Life magazine and Purdue University’s Center for Food and Agricultural Business conducted a survey for the 13th consecutive year to assess the adoption of precision agriculture practices in the U.S. from the perspective of the retail crop input dealer. The questionnaire was mailed to 2500 retail crop input dealerships across the U.S. A total of 298 questionnaires were... Tipo: Working or Discussion Paper Palavras-chave: Precision agriculture; Geographic information systems (GIS); Crop input dealer; Variable rate application; Site-specific agriculture; Technology adoption.; Agribusiness; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies; Q13; O30; L84. Ano: 2008 URL: http://purl.umn.edu/46427 2009 PRECISION AGRICULTURAL SERVICES DEALERSHIP SURVEY RESULTS AgEcon Whipker, Linda D.; Akridge, Jay T.. In the spring of 2009, Crop Life magazine and Purdue University’s Center for Food and Agricultural Business conducted a survey of crop input dealers for the 14th consecutive year. In February, a questionnaire was mailed to 2500 Crop Life retail crop input dealership readers across the US. (See Appendix I to this report for a copy of the questionnaire.) A total of 258 questionnaires were returned, with 241 being usable. This provided an effective response rate of 9.6 percent, the lowest response rate in the 14 year history of the project. (In prior years, response rates have ranged from a high of 38 percent in 1996 to a low of 11 percent in 2001 and 2008.) Consistent with previous surveys, dealerships were asked questions about the types of precision... Tipo: Working or Discussion Paper Palavras-chave: Precision agriculture; Geographic information systems (GIS); Crop input dealer; Variable rate application; Site-specific agriculture; Technology adoption.; Agribusiness; Q13; O30; L84.. Ano: 2009 URL: http://purl.umn.edu/56111 Factors Affecting Perceived Improvements in Environmental Quality from Precision Farming AgEcon 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 Phytosociological variability of weeds in soybean field Planta Daninha Santi,A.L.; Bona,S.D.; Lamego,F.P.; Basso,C.J.; Eitelwein,M.T.; Cherubin,M.R.; Kaspary,T.E.; Ruchel,Q.; Gallon,M.. Understanding spatial distribution of weeds in the crop enables to perform localized herbicide applications, increasing the technical and economic efficiency of operations and reducing environmental impacts. This work aimed to characterize the spatial and phytosociological variability of weeds occurring in soybean commercial field. It was conducted in an agricultural area located at the municipality of Boa Vista das Missões - RS, during the 2010/2011 harvest season. The area, that had been managed under no-tillage with soybean monoculture (summer) for five years, was divided in regular squares of 50 x 50 m (0.25 ha), totalizing 356 points. For species identification, 0.5 x 0.5 m sample squares were used. During the survey, 1,739 individuals were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Precision agriculture; Spatial distribution; Importance index value; Variable rate application. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100005 Profitability of Conventional vs. Variable Rate Nitrogen Application in Wheat Production AgEcon Boyer, Christopher N.; Brorsen, B. Wade; Solie, John B.; Raun, William R.. A variable rate nitrogen applicator based on optical reflectance measurements was developed to increase profits in wheat production by reducing the cost of production or by increasing grain yield. This paper determines if yields and profits from the variable rate treatments are significantly different from the conventional treatments. Tipo: Conference Paper or Presentation Palavras-chave: Profitability; Variable rate application; Optical reflectance sensing; Wheat; Farm Management; Production Economics. Ano: 2010 URL: http://purl.umn.edu/56405 Variable rate application of potassium fertilizer for soybean crop growth in a no-till system. Repositório Alice BERNARDI, A. C. C.; GIMENEZ, L. M.; SILVA, C. A.; MACHADO, P. L. O. A.. Variable rate application of fertilizer has the potential to improve nutrient use efficiency, improve economic returns, and reduce negative environmental impacts. The objective of this study was to evaluate the variable rate application of potassium fertilizer to soybean crop in a no-till system. The study was conducted on a 13-ha soybean grain field in Carambeí, State of Paraná, Brazil in a Typic Hapludox. The area has been under no-tillage for more than 10 years growing grains (soybean, wheat and maize) in rotation with a cover crop (oat). Four treatments were used: control, 40, 80 and 120 kg ha-1 of K2O applied as KCl. Narrow strip plots of 18 X 1,000 m were assigned in three blocks within the 13-ha field. In each strip plot grain yield was continuously... Tipo: Parte de livro Palavras-chave: Soja; Plantio direto; Potássio; Variable rate application; Soybeans; Potassium; No-tillage; Spatial variation. Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/883514 Will Variable Rate Application Technology Pay in Tennessee? AgEcon Cochran, Rebecca L.; Larson, James A.; Roberts, Roland K.; English, Burton C.. Costs differ among variable rate application systems. Most feasible in Tennessee are the 1-bin and 2-bin spreader beds mounted to existing chassis with an owner-added variable rate controller and global positioning system. Truck spreader systems required more acreage or larger custom charges making it difficult to breakeven and earn a profit. Tipo: Conference Paper or Presentation Palavras-chave: Cotton; Grid soil sampling; Precision farming; Site-specific information; Variable rate application; Research and Development/Tech Change/Emerging Technologies. Ano: 2004 URL: http://purl.umn.edu/34678 Zonal application of plant growth regulator in cotton to reduce variability and increase yield in a highly variable field. Repositório Alice VAZ, C. M. P.; FRANCHINI, J. C.; SPERANZA, E. A.; INAMASU, R. Y.; JORGE, L. A. de C.; RABELLO, L. M.; LOPES, I. de O. N.; CHAGAS, S. das; SOUZA, J. L. R. de; SOUZA, M. de; PIRES, A.; SCHEPERS, J.. This study evaluates the effect of variable-rate PGR application compared to constant-rate application to reduce yield spatial variability and increase yield. Tipo: Artigo de periódico Palavras-chave: Crescimento de planta; Reguladores de crescimento de planta; Variabilidade espacial; Imagem de satélite; Séries temporais de NDVI; Plant growth regulator; Spatial variability; Satellite images; NDVI Temporal Series; Algodão; Agricultura; Agriculture; Cotton; Plant growth; Plant growth control; Yields; Variable rate application; Variability; Normalized difference vegetation index. Ano: 2023 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1153295 Zonal application of plant growth regulator in cotton to reduce variability and increase yield in a highly variable field. Repositório Alice VAZ, C. M. P.; FRANCHINI, J. C.; SPERANZA, E. A.; INAMASU, R. Y.; JORGE, L. A. de C.; RABELLO, L. M.; LOPES, I. de O. N.; CHAGAS, S. das; SOUZA, J. L. R. de; SOUZA, M. de; PIRES, A.; SCHEPERS, J.. This study evaluates the effect of variable-rate PGR application compared to constant-rate application to reduce yield spatial variability and increase yield. Tipo: Artigo de periódico Palavras-chave: Crescimento de planta; Reguladores de crescimento de planta; Variabilidade espacial; Imagem de satélite; Séries temporais de NDVI; Plant growth regulator; Spatial variability; Satellite images; NDVI Temporal Series; Algodão; Agricultura; Agriculture; Cotton; Plant growth; Plant growth control; Yields; Variable rate application; Variability; Normalized difference vegetation index. Ano: 2023 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1153167 Registros recuperados: 9 Primeira ... 1 ... Última

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