Study on the effects of biogas application on the ac-cumulation of inorganic elements and active ingredi-ents in Astragalus membranaceus var.mongholicus
[Objective]This study investigates the effect of biogas slurry application on the accumulation of ten inorganic elements in Astragalus membranaceus var.mongholicus during growth,and analyzes the correlation be-tween these inorganic elements and active ingredients.[Method]The impact of biogas slurry concentration on the ac-cumulation of inorganic elements and active compounds in Astragalus membranaceus var.mongholicus was examined using three application methods:foliar spraying,soil fertilization and a combination of both.[Result]Biogas slurry ap-plication significantly promoted the accumulation of inorganic elements in Astragalus membranaceus var.mongholi-cus.When biogas slurry was applied solely as foliar spray,the 80%concentration treatment notably increased the con-tents of potassium(K),calcium(Ca),magnesiusm(Mg),sodium(Na)and nickel(Ni),performing significantly bet-ter than the other treatments(P<0.05).In soil fertilization treatments,the harvest data revealed that 80%biogas slurry topdressing treatment resulted in significantly higher concentrations of zinc(Zn),iron(Fe),K,Ca,Na,and manganese(Mn)compared to the other 10 treatments(P<0.05).Conventional fertilization yielded the highest Ni content in Astragalus membranaceus var.mongholicus compared to other treatments(P<0.05).Correlation analy-sis indicated significant positive correlations between Fe and the contents of calycosin-7-O-β-D-glycosides,ononin,ca-lycosin,and formononetin.Na showed a significant positive correlation with formononetin,while Mg was negatively correlated with ononin and formononetin.Additionally,Na had a negative correlation with astragaloside III content.Discriminant analysis identified Ca,Na,Mn,Fe,and Mg as the primary elements responsible for the differences be-tween the biogas slurry and other treatments.[Conclusions]Optimal concentrations and application methods of bio-gas slurry can enhance the accumulation of inorganic elements in Astragalus membranaceus var.mongholicus,with the contents of active ingredients closely linked to these inorganic elements.
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