Effects of soil conditioner application on selenium and cadmium accumulation and quality safety of ginger
To investigate the effects and mechanisms of soil conditioning agents on the nutritional quality and safety of ginger grown in heavy metal-contaminated soil,a ginger pot experiment was conducted.The effects of three soil conditioning agents(potassium silicate,maifanite,and shell powder)on the soil selenium and cadmium availability,as well as the accumulation,growth,and nutritional quality of ginger,were compared.The results showed that all three soil conditioning agents significantly increased the selenium content in ginger and effectively reduced the cadmium content.Specifically,compared to the control group,the application of 0.2% potassium silicate conditioning agent resulted in a 165.01% and 111.36% increase in selenium content in the aboveground part and rhizome of ginger,respectively.Cadmium content decreased by 71.96% and 65.15% in the aboveground part and rhizome,respectively.In addition,the application of the three soil conditioners significantly increased ginger yield,quality,and nutrient uptake.Compared to the control,the yield increased by 23.93% to 67.67%,whereas the levels of soluble sugar,soluble protein,and curcumin increased by 2.34% to 6.00%,154.72% to 602.83%,and 11.05% to 33.43%,respectively.The nutrient levels of nitrogen,phosphorus,and potassium also increased by 10.28% to 14.42%,24.62% to 34.87%,and 28.81% to 29.01%,respectively.Furthermore,the application of the three soil conditioners agents increased the activities of peroxidase and catalase in ginger,whereas reduced malondialdehyde content.Additionally,compared to the control group,the three soil conditioning agents increased soil pH by 0.35 to 0.53 and reduced the available cadmium content by 16.92% to 22.76%,and increased the available selenium content by 3.60% to 10.99% .In summary,the application of soil conditioning agents can reduce the availability of cadmium in soil and enhance the availability of selenium,thereby reducing cadmium content and increasing selenium content and nutritional quality in ginger.This approach can achieve safe utilization of cadmium-contaminated soil and ensure high-quality and safe ginger production.
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