[Objectives]This study was conducted to clarify the differences and abundance or deficiency of various elements in tobacco leaves from different positions of CB-1 in Zhangping City,so as to guide the production of pre...[Objectives]This study was conducted to clarify the differences and abundance or deficiency of various elements in tobacco leaves from different positions of CB-1 in Zhangping City,so as to guide the production of precision fertilization.[Methods]The element contents of CB-1 were determined by an X-ray fluorescence spectrometer.[Results]In terms of the contents of carbon,the upper leaves(45.73%)were significantly higher than the cutters(41.53%),and the lower leaves(43.15%)had no significant differences from both of them.For the content of oxygen element,there was no significant difference between the cutters(44.77%)and the lower leaves(43.40%),both of which were significantly higher than the upper leaves(40.75%).The contents of nitrogen,phosphorus,sulfur,boron and nickel all increased with the increase of the position,and they were significantly higher in the upper leaves than in the cutters and lower leaves.The contents of potassium,calcium,magnesium,chlorine and silicon all decreased with the increase of the position,and the lower leaves were significantly higher than the cutters and upper leaves.The contents of aluminum,titanium and chromium increased significantly with the increase of the position.The contents of strontium,zirconium and arsenic decreased significantly with the increase of the position.The element contents of tobacco leaves had significant or extremely significant differences between different parts of CB-1 in Zhangping City mostly.The contents of nitrogen,potassium,calcium,sulfur,chlorine,molybdenum and nickel in tobacco leaves were appropriate,and the contents of manganese and iron were too high,while the contents of phosphorus and copper were slightly low.The contents of magnesium,silicon,boron and sodium were too low.[Conclusions]This study can guide targeted fertilization and regulation of element contents in the tobacco leaves from different parts in production,and is of great significance to improving the production,quality and industrial availability of CB-1.展开更多
As the number of diabetics increases worldwide,the amount of research so as to bibliometric re-search on diabetes is also growing.In order to review the existing research on diabetes from a macro perspective and to re...As the number of diabetics increases worldwide,the amount of research so as to bibliometric re-search on diabetes is also growing.In order to review the existing research on diabetes from a macro perspective and to remedy the lack of attention given to conference papers,this paper collected a total of 67,104 diabetes-related conference papers on the theme of"diabetes"up to 23 October 2020 in the core collection of Web of Science.Tools for bibliometric analysis include Citespace and vosviewer and other tools such as Excel and Origin are applied for statistical analysis and visualization of the results.Consequently,publication trend,document co-citation,journal co-citation and author co-citation are analyzed based on these papers,and core docu-ments,journals and authors are identified.This study not only shows the current situation of a-cademic conferences related to diabetes research but also,to a certain extent,reveals the devel-opment of the diabetes research situation in the whole field.Meanwhile,this study quantitatively analyzed the intellectual base on diabetes,which can be an illustration of the benefits of biblio-metric analysis as a tool in scientific research.展开更多
基金Supported by Science and Technology Project of China Tobacco Hebei Industrial Co.Ltd.(2021130000300029).
文摘[Objectives]This study was conducted to clarify the differences and abundance or deficiency of various elements in tobacco leaves from different positions of CB-1 in Zhangping City,so as to guide the production of precision fertilization.[Methods]The element contents of CB-1 were determined by an X-ray fluorescence spectrometer.[Results]In terms of the contents of carbon,the upper leaves(45.73%)were significantly higher than the cutters(41.53%),and the lower leaves(43.15%)had no significant differences from both of them.For the content of oxygen element,there was no significant difference between the cutters(44.77%)and the lower leaves(43.40%),both of which were significantly higher than the upper leaves(40.75%).The contents of nitrogen,phosphorus,sulfur,boron and nickel all increased with the increase of the position,and they were significantly higher in the upper leaves than in the cutters and lower leaves.The contents of potassium,calcium,magnesium,chlorine and silicon all decreased with the increase of the position,and the lower leaves were significantly higher than the cutters and upper leaves.The contents of aluminum,titanium and chromium increased significantly with the increase of the position.The contents of strontium,zirconium and arsenic decreased significantly with the increase of the position.The element contents of tobacco leaves had significant or extremely significant differences between different parts of CB-1 in Zhangping City mostly.The contents of nitrogen,potassium,calcium,sulfur,chlorine,molybdenum and nickel in tobacco leaves were appropriate,and the contents of manganese and iron were too high,while the contents of phosphorus and copper were slightly low.The contents of magnesium,silicon,boron and sodium were too low.[Conclusions]This study can guide targeted fertilization and regulation of element contents in the tobacco leaves from different parts in production,and is of great significance to improving the production,quality and industrial availability of CB-1.
基金support and helpful comments on this document.Authors gratefully acknowledge the grant from The National Social Science Fund of China(Grant No.22GBL048).
文摘As the number of diabetics increases worldwide,the amount of research so as to bibliometric re-search on diabetes is also growing.In order to review the existing research on diabetes from a macro perspective and to remedy the lack of attention given to conference papers,this paper collected a total of 67,104 diabetes-related conference papers on the theme of"diabetes"up to 23 October 2020 in the core collection of Web of Science.Tools for bibliometric analysis include Citespace and vosviewer and other tools such as Excel and Origin are applied for statistical analysis and visualization of the results.Consequently,publication trend,document co-citation,journal co-citation and author co-citation are analyzed based on these papers,and core docu-ments,journals and authors are identified.This study not only shows the current situation of a-cademic conferences related to diabetes research but also,to a certain extent,reveals the devel-opment of the diabetes research situation in the whole field.Meanwhile,this study quantitatively analyzed the intellectual base on diabetes,which can be an illustration of the benefits of biblio-metric analysis as a tool in scientific research.
