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| Effects of quicklime application at different rice growing stage on the cadmium contents in rice grain |
| Received:March 30, 2016 |
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| KeyWord:Oryza sativa L.;growing stage;quicklime;rice grain;calcium(Ca);cadmium(Cd) |
| Author Name | Affiliation | E-mail | | ZHANG Zhen-xing | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | | | JI Xiong-hui | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | jixionghui@yahoo.com | | XIE Yun-he | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | | | GUAN Di | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | | | PENG Hua | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | | | ZHU Jian | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | | | TIAN Fa-xiang | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
Key Laboratory for Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China | |
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| Abstract: |
| The pot experiment was carried out to further explore the process mechanism that how quicklime applications reduce Cd contents in rice grain cultivated in the Cd-contaminated paddy soils. In the control treatment no quicklime was applied into soil. While in other four treatments, the quicklime was added into soil as lime suspension before the transplanting and at tillering, booting and filling stages, respectively. The plant samples and soil samples were collected after the harvest and then were subjected to analyze aimed indexes. Results showed that soil pH was significantly increased, but available Cd contents in soil and total Cd contents in roots and brown rice were significantly(P<0.05) decreased after soil was amended with quicklime at different growing stages. However, after the quicklime was applied at tillering stage, the total Cd contents in brown rice was decreased with a maximum reduction that was 55.2% below the control, which was significantly(P<0.05) lower than other treatments. Meanwhile, the total Ca contents in rice stem-leave was found to be significantly(P<0.05) higher than others, but the total Cd contents in rice stem-leave was significantly lower than others. Besides, the multivariate principal component analysis showed that Cd content in rice stem-leave was significantly(P<0.05) negatively correlated with Ca contents. Therefore, the results indicate that applying quicklime at tillering stage not only reduce available Cd contents in soil and decrease Cd absorption and accumulation in root, but also can improve Ca contents in rice stem-leave and then inhibit the Cd translocation from root to stem-leave. The two processes may be key factors reducing Cd contents in the brown rice when quicklime is applied at tillering stage. |
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