The Effect of Organic Fertilizer on Cadmium Accumulation and Migration in Soil-Radish Systems
A pot experiment was conducted to investigate the migration and accumulation of cadmium(Cd)in the soil-rad-ish system by planting radish under different concentrations of fresh pig manure and chicken manure(0,15,30,45,and 60 t/hm2).The results showed that Cd accumulated in both the soil and radish after the application of organic fertilizers,with signifi-cant differences in Cd content between various dosages and the control group.Compared to the control,the total Cd content in-creased by 7.23%and 7.45%for pig manure and chicken manure,respectively,under the treatment of 60 t/hm2.The Cd concen-tration in the radish root system significantly increased at the harvest period,particularly when chicken manure was applied,al-though the Cd concentration also rose notably with pig manure.The Cd concentration in radish roots peaked during the vigorous leaf growth period.Under the same treatment conditions,as the growth time of radish extended,the Cd concentration in roots de-creased while that in leaves increased.Specifically,the Cd content in leaves increased by 18.99%and 5.79%with pig manure and chicken manure,respectively,under the 60 t/hm2 treatment.Across different treatments,the maximum concentration coeffi-cient of Cd in radish was 0.16,while the maximum value of the Cd transfer coefficient from root to leaf was 1.25.Importantly,the total Cd content in the soil did not exceed national standards for soil environmental quality,and the Cd content in the radish roots remained within the national food safety standards.
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