Study on the Activation Effect of Fermented Organic Fertilizers on Selenium in the Soil of Southern Dragon Fruit Orchards

[Objectives]This study was conducted to explore the effects of using fermented organic fertilizers such as cow manure on the activity of selenium in the soil.[Methods]The project team applied the organic fertilizer prepared by fermenting cow manure and other raw materials to activate selenium in the soil at two dragon fruit orchard bases in Shilong Town,Guiping City and Dingdang Town,Long an County,and carried out many years of experiments.[Results]The contents of available selenium in the two experimental orchards in Shilong Town and Dingdang Town increased by 10%and 5%,respectively,and the selenium contents in dragon fruit increased by 228.6%and 200.0%,respectively.[Conclusions]The application of fermented organic fertilizers such as cow manure can increase available selenium content in the soil,thereby increasing the selenium content of dragon fruit.

Comparative Analysis of Sugar Production Cost in Guangxi and World Major Producing Countries

Guangxi is the largest sugar producing area in China and shoulders heavy responsibilities for the development of China’s sugar industry.In recent years,China’s sugar industry has been greatly impacted by the foreign low-cost sugar industry,and the planting area of sugarcane has been declining.The development foundation of the sugar industry is the sugarcane seed industry.Under the impact of foreign low-price sugar,China’s sugarcane industry is under greater pressure for development,and the sugarcane seed industry shoulders more arduous responsibilities.In order to cope with international competition,the development of Guangxi’s sugarcane industry urgently needs to establish a development model oriented towards improved varieties,scale and mechanization of sugarcane,so as to promote the high-quality development of Guangxi’s sugarcane industry and effectively respond to the pressure of competition in the international sugarcane industry.

Investigation and Analysis on Production Cost of Guangxi Sugar Industry

Guangxi is the largest cane sugar production base in China,with more than 20 million sugar related personnel,and sugar related personnel account for about 50%of the total population in Guangxi.The development of cane sugar industry plays an important role in Guangxi and even the whole country.At present,there are still many difficulties and problems in Guangxi sugar industry,such as imperfect industrial chain,high industrial operation cost and weak comprehensive competitiveness.In this paper,by analyzing production cost of cane sugar,management cost,financial cost and cane consumption of sugar per ton in Guangxi,and starting from the problems in cane sugar production of Guangxi,development countermeasures of Guangxi sugar industry reducing cost and increasing efficiency under the new situation are put forward.

High-quality Development of Selenium-enriched Industry in Guangxi Driven by Scientific and Technological Innovation

As the largest natural selenium-enriched soil area in China,Guangxi has achieved a leapfrog development in its selenium-enriched industry through the implementation of major scientific and technological projects driven by selenium-enriched innovation.The selenium-enriched industry has also become a new force in the poverty alleviation industry in Guangxi,making remarkable achievements.While summarizing and sorting out the effective measures and effects of scientific and technological innovation driving the development of selenium-enriched industry,the present paper analyzed some shortcomings and problems in the high-quality development of the selenium-enriched industry driven by the scientific and technological innovation.Finally,in view of the problems,it came up with pertinent recommendations and countermeasures,to better promote high-quality development of the selenium-enriched industry and boost the rural revitalization.

Antigenic Drift of the Hemagglutinin from an Influenza A(H1N1) pdm09 Clinical Isolate Increases its Pathogenicity In Vitro

The influenza A(H1 N1)pdm09 virus emerged in 2009 and has been continuously circulating in humans for over ten years.Here,we analyzed a clinical influenza A(H1 N1)pdm09-infected patient case hospitalized for two months in Guangdong(from December 14,2019 to February 15,2020).This isolate,named A/Guangdong/LCF/2019(LCF/19),was genetically sequenced,rescued by reverse genetics,and phylogenetically analyzed in the context of other relevant pdm09 isolates.Compared with earlier isolates,this pdm09 virus’s genetic sequence contains four substitutions,S186 P,T188 I,D190 A,and Q192 E,of the hemagglutinin(HA)segment at position 186–192(H3 numbering)in the epitope Sb,and two of which are located at the 190-helix.Phylogenetic analysis indicated that the epitope Sb started undergoing a rapid antigenic change in2018.To characterize the pathogenicity of this novel substitution motif,a panel of reassortant viruses containing the LCF/2019 HA segment or the chimeric HA segment with the four substitutions were rescued.Kinetic growth data revealed that the reassortant viruses,including the LCF/2019 with the PTIAAQE substitution,propagated faster than those rescued ones having the STTADQQ motif in the epitope Sb in Madin-Darby Canine Kidney(MDCK)cells.The HI test showed that the binding activity of escape mutant to 2018 pdm09 sera was weaker than GLW/2018,suggesting that old vaccines might not effectively protect people from infection.Due to the difference in the selection of vaccine strains,people vaccinated in the southern hemisphere could still suffer a severe infection if infected with this antigenic drift pdm09 virus.