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Evaluating Nitrogen Behavior in Sugarcane after Fertilization Using Leaf and Sap Extract Analyzes

American Journal of plant Sciences 2014年第18期5卷 2655-2664页

作者： Helio A.W.Joris Thais R.Souza Zaqueu F.Montezano vitor p.vargas Heitor Cantarella Soils and Environmental Resources Center Instituto Agronomico(IAC)CampinasBrazil

Nitrogen (N) fertilization is important for sugarcane crops, for both agronomic and environmental reasons. Better use of N from fertilizer is required for crop management, and in order to achieve it, adequate N nutrition monitoring is necessary. Sap extract analysis is a sensitive technique that has been adopted in other crops to tackle this objective, and can be used for sugarcane. The aim of this study was to evaluate the behavior of N and the response of sugarcane after N fertilization, using sap and leaf tissue analysis. The study was undertaken in two experimental areas in 2012/2013 season, using ratoon cane, following application of 0, 50, 100, and 150 kg·ha-1 of N. The youngest visible leaves were sampled from sugarcane at five time points between 0 and 150 days after fertilization, to evaluate the nitrate, ammonium, and total N content of sap extract, and total N content of leaf tissue. At the first sampling point (30 days after N fertilizer application), mineral N in sap increased as a result of N fertilization in medium-textured soil, and remained high until 120 days after fertilization in clayey soil. The total N content of sap followed a similar behavior. Stalk yield was only observed to increase in sugarcane grown in the clayey soil. Sap analysis proved to be an efficient method for monitoring N status in sugarcane grown in different soil types.

关键词： Saccharum spp. Mineral Nitrogen Nitrogen Absorption Ratoon Cane Nutritional Status

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Scientific development of smart farming technologies and their application in Brazil

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Information processing in Agriculture 2018年第1期5卷 21-32页

作者： Dieisson pivoto paulo Dabdab Waquil Edson Talamini Caroline pauletto Spanhol Finocchio vitor Francisco Dalla Corte Giana de vargas Mores Universidade Federal do Rio Grande do Sul Center for Studies and Research in Agribusiness7712 Bento Gonc¸alves AvenueAgronomy DistrictPorto AlegreState of Rio Grande do SulBrazil Universidade Federal do Rio Grande do Sul Department of Economics and Foreign Affairs and Center for Studies and Research in Agribusiness7712 Bento Gonc¸alves AvenueAgronomy DistrictPorto AlegreState of Rio Grande do SulBrazil Universidade Federal do Rio Grande do Sul 7712 Bento Gonc¸alves AvenueAgronomy DistrictPorto AlegreState of Rio Grande do Sul 33086-586Brazil Meridional University–IMED Business School304 Senador Pinheiro StreetRodrigues DistrictPasso FundoState of Rio Grande do Sul 99070-220Brazil Universidade Federal do Rio Grande do Sul Universidade Comunitária da Região de Chapecò7712 Bento Gonc¸alves AvenueAgronomy DistrictPorto AlegreState of Rio Grande do Sul 33086-586Brazil

Smart farming(SF)involves the incorporation of information and communication technologies into machinery,equipment,and sensors for use in agricultural production *** technologies such as the internet of things and cloud computing are expected to advance this development,introducing more robots and artificial intelligence into ***,the aims of this paper are twofold:(i)to characterize the scientific knowledge about SF that is available in the worldwide scientific literature based on the main factors of development by country and over time and(ii)to describe current SF prospects in Brazil from the perspective of experts in this *** research involved conducting semi-structured interviews with market and researcher experts in Brazil and using a bibliometric survey by means of data mining *** between the different available systems on the market was identified as one of the main limiting factors to SF *** limiting factor is the education,ability,and skills of farmers to understand and handle SF *** limitations revealed a market opportunity for enterprises to explore and help solve these problems,and science can contribute to this ***,the United States,South Korea,Germany,and Japan contribute the largest number of scientific studies to the *** that invest more in R&D generate the most publications;this could indicate which countries will be leaders in smart *** use of both research methods in a complementary manner allowed to understand how science frame the SF and the mains barriers to adopt it in Brazil.

关键词： Agricultural innovation Big data Data in agriculture Information technology Text mining

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Diagnostic neuroradiology for the interventional neuroradiologist

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World Journal of Radiology 2013年第11期5卷 386-397页

作者： vitor Mendes pereira Maria Isabel vargas Ana Marcos philippe Bijlenga Ana paula Narata Sven Haller Karl-Olof Lvblad Service Neuro-diagnostique et Neuro-interventionnel Geneva University Hospitals Service de Neurochirurgie HUG Geneva University Hospitals

In order to further improve the impact of the continuously evolving neurointerventional techniques, the interventional neuroradiologist needs to have at his disposal more powerful techniques to image the central nervous system. With the recent development of diagnostics techniques that are computed tomography and magnetic resonance based we are now able to assess not just morphology, but also physiology, physiopathology and function. This review discusses the place of diagnostic techniques in the evaluation that the interventional neuroradiologist hast to make when confronted with patients. We provide an overview of current techniques for the brain and spine.

关键词： Neuroradiology Brain Imaging Magnetic resonance Interventional radiology

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