title: Efficiency evaluation for remediating paddy soil contaminated with cadmium and arsenic using water management, variety screening and foliage dressing technologies.
abstract: Paddy soils in many regions of China have been seriously polluted by multiple heavy metals or metalloids, such as arsenic (As), cadmium (Cd) and lead (Pb). In order to ensure the safety of food and take full advantage of the limited farmland resources of China, exploring an effective technology to repair contaminated soils is urgent and necessary. In this study, three technologies were employed, including variety screening, water management and foliage dressing, to assess their abilities to reduce the accumulation of Cd and As in the grains of different rice varieties, and meanwhile monitor the related yields. The results of variety screening under insufficient field drying condition showed that the As and Cd contents in the grains of only four varieties [Fengliangyouxiang 1 (P6), Zhongzheyou 8 (P7), Guangliangyou 1128 (P10), Y-liangyou 696 (P11)] did not exceed their individual national standard. P6 gained a relatively high grain yield but accumulated less As and Cd in the grains despite of the relatively high As and Cd concentrations in the rhizosphere soil. However, long-playing field drying in water management trial significantly increased Cd but decreased As content in the grains of all tested three varieties including P6, suggesting an important role of water supply in controlling the accumulation of grain As and Cd. Selenium (Se) showed a stronger ability than silicon (Si) to reduce As and Cd accumulation in the grains of Fengliangyou 4 (P2) and Teyou 524 (P13), and keep the yields. The results of this study suggest that combined application of water management and foliage dressing may be an efficient way to control As and Cd accumulation in the grains of paddy rice exposing to As- and Cd-contaminated soils.
authors.affiliation: Agricultural College, Guangxi University, Nanning, China; Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China.
authors.forename: Guojian
authors.initials: G
authors.lastname: Liao
authors.affiliation: Agricultural College, Guangxi University, Nanning, China; Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China.
authors.forename: Qianhua
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Agricultural College, Guangxi University, Nanning, China; Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China; Innovation Team of Remediation of Heavy Metal Contaminated Farmland Soil, Chinese Academy of Agricultural Sciences, China. Electronic address: frwzym@aliyun.com.
authors.forename: Renwei
authors.initials: R
authors.lastname: Feng
authors.affiliation: Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China; Innovation Team of Remediation of Heavy Metal Contaminated Farmland Soil, Chinese Academy of Agricultural Sciences, China.
authors.forename: Junkang
authors.initials: J
authors.lastname: Guo
authors.affiliation: Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China; Innovation Team of Remediation of Heavy Metal Contaminated Farmland Soil, Chinese Academy of Agricultural Sciences, China.
authors.forename: Ruigang
authors.initials: R
authors.lastname: Wang
authors.affiliation: Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China; Innovation Team of Remediation of Heavy Metal Contaminated Farmland Soil, Chinese Academy of Agricultural Sciences, China.
authors.forename: Yingming
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Institute of Agro-Environmental Protection, The Ministry of Agriculture, Tianjin 300191, China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Agricultural College, Guangxi University, Nanning, China.
authors.forename: Zhilian
authors.initials: Z
authors.lastname: Fan
authors.affiliation: Agricultural College, Guangxi University, Nanning, China. Electronic address: moly@gxu.edu.cn.
authors.forename: Liangyu
authors.initials: L
authors.lastname: Mo
mesh_terms: D000383:Agriculture; D001151:Arsenic / Q000032:analysis*; D002104:Cadmium / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis*; D012275:Oryza / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements
chemical_list: D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D001151:Arsenic
keywords: Foliage dressing; Heavy metal pollution; Paddy rice; Variety screening; Water management