Effects of a combination of activated iron tailings and magnesium-modified biochar on rice seedling growth and properties of saline-alkali soil
This study aimed to investigate the effects of activated iron tailings and magnesium-modified biochar materials on rice seedling growth and soil properties,as well as to assess the viability of improving rice production in saline-alkaline soil.A scanning electron microscope was used to characterize the morphology and structure of the biochar materials,and Fourier transform infrared spectrometry was applied to determine the functional group composition of the magnesium-modified biochar materials.Pot tests were undertaken to investigate the morphological impacts of activated iron tailings and biochar materials,the physiological traits of rice seedlings,and the effects on saline-alkali soil.Compared with other biochar materials,our results suggested that activated iron tailings and biochar treated with magnesium had more surface functional groups,larger pores,and a rougher surface.Pot experiments demonstrated that plant height,root length,root-shoot ratio,and dry weight of rice seedlings after applying the activated iron tailing-magnesium-modified biochar increased by 12.61%,191.49%,42.93%,and 100.00%respectively,in comparison to the control group.Malondialdehyde and active oxygen concentrations in leaves decreased by 65.76%and 46.46%,respectively.Catalase and superoxide dismutase activities,and chlorophyll and soluble protein levels,increased by 117.35%,44.75%,55.00%,and 19.31%,respectively.After applying iron tailings-magnesium-modified biochar,the electric conductivity of saline-alkali soil was reduced,while pH,total carbon,total nitrogen,total phosphorus,soil available silicon,and total potassium contents increased.These results indicate that activated iron tailings and magnesium modified biochar have great potential,and their application can enhance the physical and chemical properties and nutritional content of saline-alkaline soil,reduce the active oxygen content of rice seedlings,increase the activity of antioxidant enzymes,and mitigate the stress of saline soils on the growth of rice seedlings.Moreover,rice seedling growth in saline-alkaline soil can be promoted by increasing the accumulation of dry matter.
activated iron tailing-magnesium-modified biocharriceenzyme activitysoda-salt-alkali soil
万方数据
维普
