基施镁肥对甜菜幼苗生长及养分吸收的影响OA

[Objective]Magnesium is an essential plant nutrient.The purpose of this experiment was to investigate the effects of magnesium on the growth and nutrient absorption of sugar beet seedlings.[Methods]A field experiment was conducted on black soil in Harbin.Three magnesium fertilizer rates were applied:Mg0(0 kg/hm2),Mg40(40 kg/hm2),and Mg80(80 kg/hm2).Effects on seedling morphological traits,biomass,photosynthetic pigment content,and mineral element uptake were analyzed.[Results]The results showed that all magnesium fertilizer treatments significantly promoted the growth of sugar beet seedlings in terms of plant height,functional leaf area,and leaf area index.Among them,the Mg80 treatment was most effective,with plant height,leaf length,and leaf width increasing by 28.46%,39.33%and 59.65%,respectively,compared to the control.Furthermore,magnesium fertilizer significantly increased chlorophyll a,b,and total chlorophyll contents,compared to the control,and promoted dry matter accumulation in both above-ground and below-ground parts.Nutrient analysis revealed that magnesium fertilizer not only elevated Mg and Ca content in plants but also significantly increased the uptake and accumulation of trace elements such as Zn,Fe,Mn,and Cu.Under the Mg80 treatment,compared to the control,Mg accumulation in the above-ground parts increased significantly by 98.45%,while in the below-ground parts it increased by 84.48%;Ca accumulation in the above-ground parts increased by 89.23%,and in the below-ground parts by 97.65%.[Conclusion]In summary,applying 80 kg/hm2 of magnesium fertilizer under these production conditions effectively optimizes sugar beet seedling growth and nutrient utilization,providing scientific support for high-yield sugar beet cultivation in Northeast China's black soil region.