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| Effect of integrative remediation measures, based on foliar fertilizer and several passivation materials, on Cd accumulation in rice |
| Received:March 21, 2019 |
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| KeyWord:cadmium;foliage fertilizer;passivation;rice;integrative technology |
| Author Name | Affiliation | E-mail | | LI Jia-lin | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LIANG Jin-ming | Zhongshan Agricultural Science and Technology Extension Center, Zhongshan 528400, China | | | CHEN Bo-hua | Zhongshan Agricultural Science and Technology Extension Center, Zhongshan 528400, China | | | LI Yong-tao | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | WANG Jin-jin | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | wangjinjin@scau.edu.cn |
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| Abstract: |
| In order to deal with the current status of soil pollution, involving complex sources, we conducted a series of field experiments; in particular, we investigated the effect of integrative remediation measures(based on foliar fertilizer and several passivation materials)on Cd accumulation in rice. The results indicated that the tested ‘foliar fertilizer’ had no significant impact on Cd accumulation in different parts of the rice plant. The integrative treatments(i.e.,‘modified molybdenum ore’,‘foliar fertilizer + modified molybdenum ore’,‘foliar fertilizer + lime’, and ‘foliar fertilizer + hydroxyapatite’)could instead reduce Cd concentrations in all parts of the rice plant, but had no significant effect on rice yields:root Cd decreased from 47.9% to 23.1%, straw Cd from 37.5% to 64.3%, and the Cd concentration in rice grain decreased from 48.8% to 25.2%. Notably, the Cd content in rice grain was lower than the National Food Safety Standard Limit(0.2 mg·kg-1)under all treatments, except in the case of the ‘foliar fertilizer’ treatment. The main effect of the modified molybdenum ore was to reduce soil available Cd concentration and Cd concentration in roots:it reduced the migration of Cd from soil to rice, successfully reducing the Cd content in rice grains. The treatments containing foliar fertilizer significantly affected the distribution of Cd in rice, mainly by reducing Cd migration from rice root to shoot. The combined application of foliar fertilizer and modified molybdenum ore provided significant application advantages compared with that of simple foliar fertilizer; however, no significant difference was found between ‘foliar fertilizer + modified molybdenum ore’ and single application of ‘modified molybdenum ore’. Perhaps, these results were due to the low pollution risk level and the period of application of the foliar fertilizer. A comprehensive consideration of the remediation effect, its additive amount, and potential long-term effects, a systematic measure of ‘foliar fertilizer + silicon passivation’ is an effective passivation method for safe utilization of Cd contaminated paddy soil in Pearl River Delta. The great significance of this study lies in providing solid data for the establishment of a technology system that would allow the safe utilization of heavy metal-contaminated soils in China. |
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