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| DOI：10.13522/j.cnki.ggps.GP201607270002 |
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| Potassium Fertilizer Enhances the Mobility of Cadmium in Paddy Soil Amended with Sepiolite |
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SUN Guohong, WANG Pengchao, XU Yingming, HUANG Qingqing, LIANG Xuefeng, HUANG Rong
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1. College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China; 2. Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Ago-Environmental Protection Institute, MARO, Tianjin 300191, China；3. Key Laboratory of Original Environmental Pollution Prevention Control, MARO, Tianjin 300191, China
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| Abstract: |
| 【Objective】The mobility of heavy metals in soil is modulated by various chemical and biochemical processes and this paper aims to elicit the efficacy of potassium fertilizer in enhancing the mobility of cadmium in paddy soil. 【Method】The experiment were conducted in pots grown with brown rice, and the potassium was applied in KCl and K2SO4, respectively, at rate of 0.10 g/kg soil (L), 0.20 g/kg soil (M) and 0.40 g/kg soil (H), measured in unit of K2O. The soil was amended with sepiolite (S) at ratio of 10 g/(kg of soil). No K application was the control (CK).【Result】 Immobilization of cadmium by sepiolite boost the biomass of the rice, and application of KCl reduced the biomass of the rice by 4.66%~11.47%, compared to CK. Treatment L insignificantly increased the rice yield by 2.69%, while M and H treatment reduced the yield by 1.10% and 14.97% respectively, compared to the CK. Addition of KCl to the amended soil enhanced the bioavailability of Cd by 41.67%~58.33%. Similarly, adding K2SO4 also increased the bioavailable Cd by 16.67%~33.33%. Compared with CK, the L, M and H treatment with KCL increased Cd content in brown rice by 53.38%, 46.15% and 200%, respectively, and the associated increase with K2SO4 was 7.69%, 38.46% and 23.08%, respectively.【Conclusion】In Cd-contaminated paddy soil amended by sepiolite, applying potassium in KCL and K2SO4 can both significantly improve Cd mobility and uptake by brown rice, particularly KCl at high application rate. |
| Key words: pollution; soil; sepiolite; immobilization treatment; potash fertilizer; rice |
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