| Amorphophallus konjac has a high incidence of soil-borne diseases and there is no effective control means,which has greatly affected the development of konjac industry.However,the occurrence of konjac diseases was aggravated when planting konjac at low altitude.Thus,it is of great significance to study the planting techniques of konjac in low altitude areas by exploring the effects of different cultivation measures on the growth and disease occurrence of konjac in low altitude areas,so as to promote the development of konjac industry.In this study,three cultivation measures were set up,namely,conventional cultivation in low altitude area(net cultivation of konjac with shading net),rain shelter cultivation(plastic film to build rain shelter environment + shading net),and shade cultivation(thickening shading net to create shade environment).The effects of different cultivation measures on soil borne diseases and konjac growth were evaluated by analyzing the emergence rate,plant size,photosynthetic parameters,disease incidence rate and rhizosphere microbial community structure.Rain shelter cultivation can not only effectively reduce the occurrence of diseases such as soft rot of konjac(compared with conventional cultivation,the incidence rate is reduced by more than 60%),but also effectively reduce the effect of weeds on konjac soil-borne diseases,which is related to the decrease of water content in the topsoil of konjac field.Moreover,rain shelter cultivation was beneficial to the emergence of konjac seedlings,but the plant development is blocked,which is related to the increase of field soil temperature and the decrease of soil moisture content after rain shelter.The changes of field environment(soil temperature,soil moisture,weed biomass)had a significant effect on the community structure of bacteria and fungi in the rhizosphere of Amorphophallus,especially the bacteria in the rhizosphere,resulting in the decrease of their diversity,but the same was true for pathogens... |
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