title: A three-season field study on the in-situ remediation of Cd-contaminated paddy soil using lime, two industrial by-products, and a low-Cd-accumulation rice cultivar.
abstract: To mitigate the serious problem of Cd-contaminated paddy soil, we investigated the remediation potential of combining in-situ immobilization with a low-Cd-accumulation rice cultivar. A three-season field experiment compared the soil pH, available Cd and absorption of Cd by three rice cultivars with different Cd accumulation abilities grown in Cd-contaminated paddy soil amended with lime (L), slag (S), and bagasse (B) alone or in combination. The three amendments applied alone and in combination significantly increased soil pH, reduced available Cd and absorption of Cd by rice with no effect on grain yield. Among these, the LS and LSB treatments reduced the brown rice Cd content by 38.3-69.1% and 58.3-70.9%, respectively, during the three seasons. Combined with planting of a low-Cd-accumulation rice cultivar (Xiang Zaoxian 32) resulted in a Cd content in brown rice that met the contaminant limit (≤0.2mgkg-1). However, the grain yield of the low-Cd-accumulation rice cultivar was approximately 30% lower than the other two rice cultivars. Applying LS or LSB as amendments combined with planting a low-Cd-accumulation rice cultivar is recommended for the remediation of Cd-contaminated paddy soil. The selection and breeding of low-Cd-accumulation rice cultivars with high grain production requires further research.
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China; Graduate University of Chinese Academy of Sciences, Beijing, China.
authors.forename: He
authors.initials: H
authors.lastname: Yan-Bing
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China; Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha, Hunan, China.
authors.forename: Huang
authors.initials: H
authors.lastname: Dao-You
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China; Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha, Hunan, China. Electronic address: qhzhu@isa.ac.cn.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Qi-Hong
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Shuai
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Shou-Long
authors.affiliation: Suxian District Agricultural Bureau, Chenzhou, Hunan, China.
authors.forename: He
authors.initials: H
authors.lastname: Hai-Bo
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Han-Hua
authors.affiliation: Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, Hunan, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Chao
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism*; D017610:Calcium Compounds / Q000032:analysis; D002482:Cellulose / Q000032:analysis; D002681:China; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste / Q000032:analysis; D012275:Oryza / Q000378:metabolism*; D010087:Oxides / Q000032:analysis; D012621:Seasons; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D017610:Calcium Compounds; D007220:Industrial Waste; D010087:Oxides; D012989:Soil Pollutants; D002104:Cadmium; D002482:Cellulose; C027433:bagasse; C016538:lime
keywords: Bagasse; Cultivar; Immobilization; Lime; Rice; Slag