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| Primary research on cadmium accumulation in maize and soybean intercropping system |
| Received:April 10, 2020 |
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| KeyWord:maize;soybean;intercropping;cadmium;absorption |
| Author Name | Affiliation | E-mail | | LI Han | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | HUANG Dao-you | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | HUANG Shan | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | TANG Bin | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | GUO Huan-le | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | CAO Zhong-yang | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | CHEN Song-lin | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | CHEN Zhi-hui | Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China | czhui2008@163.com |
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| Abstract: |
| To explore the mode of efficient planting structure adjustment in cadmium-contaminated areas, a strictly-controlled cadmium pollution fallow field(soil total cadmium content of 1.98 mg·kg-1)located in Hunan Province was selected to examine the cadmium absorption and accumulation trends of different cadmium accumulations in maize and soybean monocultures(sole maize and sole soybean) and maize and soybean intercropping. The results indicated that the straw cadmium content of maize showed a gradually decreasing trend with increase in growth time. The straw cadmium content of soybean first showed a gradually increasing and then decreasing trend with increase in growth time. The cadmium content was the highest in maize straw in the seedling stage, while it was the highest in soybean straw in the seed-filling period. The cadmium content of the seed-filling period was lower than that of the mature stage in soybean seeds. The cadmium content of the filling stage was higher than that of the mature stage in maize seeds. In the mature stage, the grain cadmium content of low cadmium maize decreased, whereas that of high cadmium accumulation maize increased in the intercropping system. The average grain cadmium contents of high and low cadmium maize in the intercropping system were 0.139 mg·kg-1 and 0.003 mg·kg-1, which were -14.88% and 88.46% lower, respectively, than those of the monocultures. The straw and grain bio-accumulation coefficients corresponding to soybean were 2.567~3.329 and 0.667~0.764; those in maize were 0.729~3.339 and 0.001~0.079, respectively. The intercropped maize straw bio-accumulation coefficients increased by 0.15%~46.22% more than those of the single maize cultivation. The grain bioaccumulation coefficients of low cadmium accumulation maize decreased by 84.62%~92.31% more than those of the single maize cultivation. The land equivalent ratio of the intercropping treatment was 1.46~1.77. Therefore, the low cadmium accumulation maize and soybean intercropping system is an effective method for the safe development of maize grains in cadmium-contaminated soil along with rational land use. |
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