Research and Prospect Analysis of Microorganisms in Selenium-Rich Soil

The importance and application prospect of microorganisms in selenium-rich soil are discussed from five aspects:the distribution of selenium-rich soil,research status at home and abroad,main groups of microorganisms in selenium-rich soil,the relationship between selenium and microorganisms,and the application.

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.

Effects of Amino Acid Selenium Foliar Fertilizer on Selenium Content and Quality of Mango

[Objectives]This study was conducted to explore the treatment methods of amino acid selenium fertilizer suitable for increasing the selenium content of mangoes and improving the quality of mangoes,so as to provide a theoretical basis for the production of selenium-enriched mangoes.[Methods]With Tainong mango as a test material,the amino acid selenium foliar fertilizer was applied by eight treatment methods to investigate the changes of selenium,soluble solid,vitamin C,and titratable acid contents in mango flesh and peel.[Results]Spraying amino acid selenium foliar fertilizer increased the selenium content of mango flesh.The selenium contents of the treatment groups T2,T3,T4 and T5 reached the selenium-enriched standard,and the T2 treatment group had the highest selenium content(0.020 mg/kg).The selenium contents in the peel of all treatment groups were greater than the corresponding selenium content in the flesh.Except for T1,the vitamin C contents of other treatment groups sprayed with amino acid selenium fertilizer increased compared with the control,and that of the T2 treatment group increased significantly(P<0.05).Compared with the control,the soluble solids of the treatment groups sprayed with amino acid selenium fertilizer once also increased.The treatment method of spraying amino acid selenium fertilizer with a dosage of 12000 ml/hm2 once(T2)achieved the best effect of increasing the selenium content and improving the quality of mangoes.[Conclusions]This study provides a scientific basis for increasing the selenium content of mangoes and improving the current situation of insufficient selenium intake.

Effect of Vermicompost on Improving Soil Ecological Environment and Increasing Crop Yield

The status of research on the utilization of vermicompost at home and abroad was reviewed from the aspects of effects of vermicompost on soil in terms of physical,chemical and biological properties,as well as effects of vermicompost as cultivation substrate and organic fertilizer on crop yield and quality improvement.Moreover,some new thoughts and prospects on the application of vermicompost in the development of agricultural and rural ecological recycling industry were put forward.