Study on the Effects of in-situ Passivation and Foliar Blocking Techniques on the Absorption and Enrichment of Cadmium in Rice from the Soil
In 2021,the repair and utilization project of cultivated land production obstacles in Xixiu District was implemented.263 pairs of soil-rice coordinated samples were collected for testing and analysis.The results showed that the sample points with low Cadmium pollution risk(class Ⅰ)and higher Cadmium pollution risk(class m)in the soil accounted for 7.22％and 3.04％respectively,and there may be a risk of Cadmium pollution in the soil,but the risk controllable sample points accoun-ted for 89.73％.The safety evaluation results of Cadmium content in the rice corresponding to it were 90.87％not exceeding the standard,7.6％slightly exceeding the standard,and 1.52％seriously exceeding the standard.There was also a case of mild Cadmium content exceeding the standard in rice with low Cadmium pollution risk in the soil.After adopting in-situ passivation and foliar blocking measures,most of the rice samples do not exceed the Cadmium standard,and only a few are slightly or severely exceeding the standard.The adoption of in-situ passivation and foliar blocking measures can effectively reduce the Cadmium content and Cadmium enrichment coefficient of rice.By comparing the effects and cost inputs of various measures,combined with the actual situation in Xixiu District,it is suggested that foliar blocking measures be taken in the paddy fields of class Ⅱ cultivated land to reduce the overall input cost and obtain a relatively extensive governance effect.In the paddy fields of class Ⅲ cultivated land,in-situ passivation measures should be adopted to ensure the governance effect,with a relatively small overall input cost.
万方数据
维普
