Paddy Soil Cadmium Pollution Prevention And Control Technology Research Of Chengdu Plain District

With the continuous development of industrialization and urbanization, pollution problems become more and more serious, agricultural products due to soil heavy metal pollution caused by food safety issues hms increasingly become the focus of attention. Cadmium is toxicity, metastatic fast, very easy to transfer in rice, and cumulative, contaminate a wide area coverage, resulting in a significant impact on the production and quality of the rice, direct hmrm to people’s health.Deyang City as an important industrial base in Chengdu Plain area, studies indicate thmt serious excessive cadmium content in rice. In this study, Deyang typical regional paddy soil for the study, mainly from the perspective of Soil-cadmium pollution of farmland soil organic-inorganic conditioning repair technology research, through the establishment of rice cadmium pollution prevention and control technology test the demonstration, effects and countermeasures of farmland heavy metals cadmium pollution prevention and control, effective control of the content of cadmium in the soil within the allowable range, under the premise of protecting the food security of residents, Deyang City safety of agricultural production and agricultural environmental protection and soil prevention and control of heavy metals to provide a scientific basis. The main results are as follows:(1) Using"organic fertilizer+modifier"as the master repair means paddy field experiment,"cow dung+ the conventional fertilizer+ sepiolite"and "cow dung+ conventional fertilizer+ calcium magnesium phosphmte"processing plant strains better role in promoting the growth of high tiller number, former as oilseed rape processing, add the sepiolite and calcium magnesium phosphate biomass relative to the blank increase of 47.91%,32.48%, former as wheat grew by 57.30% and 21.85%.About soil remediation and reducing the concentration of cadmium in brown rice, add conditioner treatment significantly reduced soil and brown rice cadmium content in overall showing:sepiolite> lime> calcium magnesium phosphmte this regularity:the former as the oilseed rape of paddy soil application kinds of conditioner after cadmium content as follows:0.237 mg/kg and 0.243 mg/kg,0.242 mg/kg, compared with the control were reduced by 55.95%,54.83%,55.02%, and the corresponding cadmium content in brown rice followed by:0.133 mg/kg, compared to 0.183 mg/kg and 0.218 mg/kg, compared with the control were reduced by 46.37%,26.21%,12.11%; former as wheat, paddy soil after the application of three modifier cadmium content were:0.252mg/kg, compared to 0.296 mg/kg and 0.343 mg/kg, and the control were reduced by 48.68%,39.72%, 30.13%, and the corresponding cadmium content in brown rice were 0.135 mg/kg and 0.119 mg/kg,0.196mg/kg, compared with CK were reduced by 45.12%,51.63%, 20.32%.(2) When "Straw+modifier "as the master repair means in paddy field experiment, adding calcium magnesium phosphmte and sepiolite process can promote the growth of the rice plant, height and number of tillers, improve biomass. Add the rice calcium magnesium phosphate and sepiolite processing biomass Compared with CK former as rapeseed increased by 5.72% and 4.10%, an increase of 9.15% and 12.64% former as wheat.About soil remediation and reducing the concentration of cadmium in brown rice, "straw+modifiers" processing significantly reduce the cadmium content of soil and rice plants, the overall showing:sepiolite> lime> calcium magnesium phosphmte this law. The former as the oilseed rape of paddy soil application, the "straw+ three improvers"after cadmium content were 0.113 mg/kg,0.145 mg/kg and 0.272 mg/kg, compared with the control were reduced by 73.90%,66.51%,37.18%, brown rice in cadmium content were 0.141 mg/kg,0.191 mg/kg and 0.162 mg/kg, compared with the CK were reduced by 44.71%,25.10% and 36.47%. Before paddy soil application as wheat "straw+ three modifiers", cadmium content were 0.160 mg/kg,0.235 mg/kg and 0.234 mg/ kg, compared with the control were reduced by 67.34%,52.04%,52.25%, the corresponding brown rice in cadmium content of 0.134 mg/kg and 0.172 mg/kg and 0.162 mg/kg, followed by decline of 46.61%,31.47%,35.46%.(3) Comprehensive individual treatment effect of the experiment, cadmium in rice distribution, various treatments hmve shown thmt the regularity of cadmium content is: grain<chmff<leaf<root; So as to reduce the cadmium content of rice, promote plant growth, increase rice production, the effect is the most significant first three:straw+ conventional fertilizer+ sepiolite> cow dung+ conventional fertilizer+ sepiolite> cow dung+ conventional chemical fertilizer+lime.