A field trial was conducted to evaluate the role of boron （B） application at different growth stages in improving the growth,yield and net economic return of rice at farmer＇s fields during summer season,2009.Boron ...A field trial was conducted to evaluate the role of boron （B） application at different growth stages in improving the growth,yield and net economic return of rice at farmer＇s fields during summer season,2009.Boron was soil applied （1.5 kg/hm2） at the transplanting,tillering,flowering and grain formation stages of rice;foliar applied （1.5% B solution） at the tillering,flowering and grain formation stages of rice,and dipped seedling roots in 1.5% B solution before transplanting;while control plots did not apply any B.Boron application （except dipping of seedling roots in B solution,which caused toxicity and reduced the number of tillers and straw yield than control） substantially improved the rice growth and yield.However,soil application was better in improving the number of grains per panicle,1000-grain weight,grain yield,harvest index,net economic income and ratio of benefit to cost compared with the rest of treatments.Overall,for improving rice performance and maximizing the net economic returns,B might be applied as soil application at flowering.展开更多
Two-dimensional（2D） materials have recently received a great deal of attention due to their unique structures and fascinating properties,as well as their potential applications.2D hexagonal boron nitride（2D hBN）,a...Two-dimensional（2D） materials have recently received a great deal of attention due to their unique structures and fascinating properties,as well as their potential applications.2D hexagonal boron nitride（2D hBN）,an insulator with excellent thermal stability,chemical inertness,and unique electronic and optical properties,and a band gap of 5.97 e V,is considered to be an ideal candidate for integration with other 2D materials.Nevertheless,the controllable growth of high-quality 2D h-BN is still a great challenge.A comprehensive overview of the progress that has been made in the synthesis of 2D h-BN is presented,highlighting the advantages and disadvantages of various synthesis approaches.In addition,the electronic,optical,thermal,and mechanical properties,heterostructures,and related applications of 2D h-BN are discussed.展开更多
文摘A field trial was conducted to evaluate the role of boron （B） application at different growth stages in improving the growth,yield and net economic return of rice at farmer＇s fields during summer season,2009.Boron was soil applied （1.5 kg/hm2） at the transplanting,tillering,flowering and grain formation stages of rice;foliar applied （1.5% B solution） at the tillering,flowering and grain formation stages of rice,and dipped seedling roots in 1.5% B solution before transplanting;while control plots did not apply any B.Boron application （except dipping of seedling roots in B solution,which caused toxicity and reduced the number of tillers and straw yield than control） substantially improved the rice growth and yield.However,soil application was better in improving the number of grains per panicle,1000-grain weight,grain yield,harvest index,net economic income and ratio of benefit to cost compared with the rest of treatments.Overall,for improving rice performance and maximizing the net economic returns,B might be applied as soil application at flowering.
基金Project supported by the National Natural Science Foundation of China(Nos.61376007,61674137)the National Key Research and Development Program of China(No.2016YFB0400802)
文摘Two-dimensional（2D） materials have recently received a great deal of attention due to their unique structures and fascinating properties,as well as their potential applications.2D hexagonal boron nitride（2D hBN）,an insulator with excellent thermal stability,chemical inertness,and unique electronic and optical properties,and a band gap of 5.97 e V,is considered to be an ideal candidate for integration with other 2D materials.Nevertheless,the controllable growth of high-quality 2D h-BN is still a great challenge.A comprehensive overview of the progress that has been made in the synthesis of 2D h-BN is presented,highlighting the advantages and disadvantages of various synthesis approaches.In addition,the electronic,optical,thermal,and mechanical properties,heterostructures,and related applications of 2D h-BN are discussed.
