| This peper in order to explore the application and optimization of comprehensive resistance rice cadmium pollution control technology,to achieve further improvement and application in theory and practice,the individual and group with a variety of resistance test control technology mainly for different pollution levels of soil,selection of light,moderate and severe Cd contaminated soil was conducted in the field randomized block experiment the pollution degree of the technical measures into effect were discussed.And through the field control test,the pollution of paddy field in Hunan Zhuzhou Xiangtan area granite and quaternary alluvial rivers of red soil and soil parent material as the research object,explore the soil conditioner control techniques for reducing effect of absorption of Cd accumulation on the polluted soil of rice in different soil parent materials,in order to Hunan Province rice Cd pollution control technology on the basis of science.The main results are as follows:(1)the second chapter through the comprehensive control technology in rice field experiment,mild Cd pollution shows that: compared to control group,using different control technology of total cadmium content in different parts of rice decreased,indicating that the use of comprehensive resistance in the process of planting control technology to a certain extent,prevent and control of cadmium in rice the accumulation of rice in rice,including IP,VIP,VIP+N2,VIP+N1,good treatment effect,compared to CK,the decrease rate was 76.17%,82.35%,88.24% and 90.20% respectively,the light pollution area planting rice Part decreased the content of Cd to the national food safety standards.(2)the third chapter through the comprehensive control technology in moderate Cd pollution,rice field experiment shows that: compared to control group,using different control technology of total cadmium content in different parts of rice decreased,indicating that the use of comprehensive resistance in the process of planting control technology to a certain extent in the control of cadmium the accumulation of rice in rice,IP,VIP,VIP+N2,VIP+N1 showed good control effect,compared to CK,the decrease rate was 69.77%,72.09%,79.07% and 86.05% respectively,the planting area moderate pollution rice Cd content reduced to the national food safety standard.(3)the fourth chapter through the comprehensive control technology in severe Cd pollution of the rice field experiment showed that,compared to the control group,using different control technology of total cadmium content in different parts of rice decreased,indicating that the use of comprehensive resistance in the process of planting control technology to a certain extent in the control of cadmium the accumulation of rice in rice,including IP,VIP,VIP+N2,VIP+N1,good treatment effect,compared to CK,the decrease rate was 755.26%,78.95%,84.21% and 63.16% respectively,the light pollution area planting rice Cd content reduced to the national food safety standards,low cadmium in V treatment,in in heavily polluted areas,it is difficult to start a good control effect.(4)the application of soil conditioner had no significant effect on rice yield,but it could significantly reduce the content of Cd in rice,and effectively reduce the content of Cd in stem and leaf of rice.The Cd content of rice,stem and leaf of granite,Quaternary Red Soil and river alluvial 3 test points decreased by 36.90%,25.33% and 29.96%,respectively,compared with the control,and all reached significant difference levels.(5)the application of soil conditioner is mainly to improve the pH value of the soil decreased soil available Cd content in the soil decreased the activity of Cd,thereby reducing the absorption of Cd by rice accumulation;at the same time,soil conditioner Ca,Si,Zn and organic matter on the absorption and accumulation of rice Cd has inhibitory effect however,affected by parent material,there are some differences in Cd reducing effect in different locations of the application of soil conditioner. |
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