Remediation effects of combined amendment and silicon fertilizer on Cd contaminated paddy soil
LIU Jia-wei1, ZHOU Hang1,2, WEI Bin-yun1, CUI Tong-ke1,2, ZHANG Jing-yi1, HUANG Fang1, GU Jiao-feng1,2, LIU Jun3, LIAO Bo-han1,2
1. College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China; 2. Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China; 3. The Key Laboratory of Hengyang City on Ecological Impedance Technology of Heavy Metal Pollution in Cultivated Soil of Nonferrous Metal Mining Area, Hengyang 421001, China
Abstract：A field experiment was conducted in a Cd-contaminated paddy field in Liuyang City, Hunan Province, and the remediation effects of combined amendment LS (limestone + sepiolite)and application of silicon fertilizer were studied. The results showed that:(1) Application of silicon fertilizer (90kg/hm2) to the soil and treatments of spraying foliar silicon fertilizer (0.2,0.4g/L) showed no significant effects on soil pH values, while all treatments with LS application (2250, 4500kg/hm2) significantly increased soil pH (P < 0.05). (2)Application of 90kg/hmof silicon fertilizer to soil significantly decreased exchangeable Cd concentration by 20.0% and TCLP (Toxicity Characteristic Leaching Procedure) extractable Cd concentration by 18.5% in soil. While spraying foliar silicon fertilizer had no significant effect on soil Cd availability. All treatments with LS application (2250,4500kg/hm2) decreased exchangeable Cd concentrations by 25.8%~49.9% and TCLP extractable Cd concentrations by 26.4%~44.5%, respectively. (3)All three single technology treatments significantly decreased Cd concentrations in different rice tissues, but these Cd reductions in brown rice were lower than those combination treatments of the three technologies. The combination treatments (JL1F1, JL1F2, JL2F1, and JL2F2) decreased Cd concentrations in brown rice by 25.6% to 70.5%. (4)The combination technologies of “amendment LS + application of silicon fertilizer + spraying foliar silicon fertilizer” significantly decreased Cd availability in soil and Cd concentrations in all rice tissues. Among these combination technologies, JL2F2 showed the highest effect on reducing Cd concentrations in brown rice (from 0.66mg/kgto 0.19mg/kg), and realized the safe production of rice in this field with moderate to serious Cd pollution.
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