title: Impacts of rapeseed dregs on Cd availability in contaminated acid soil and Cd translocation and accumulation in rice plants.
abstract: The objective of the present study was to investigate the effects of rapeseed dregs (RSD, a commonly organic fertilizer in rural China) at application rates of 0, 0.75, 1.5, and 3.0 % on Cd availability in soil and its accumulation in rice plants (Oryza sativa L., Xiangwanxian 12#, and Weiyou 46#) by means of a pot experiment. The results showed that application of RSD resulted in a sharp decrease in the soil TCLP-extractable Cd content. However, the soil TCLP-extractable Cd content in amended soil gradually increased during the rice growing period. Application of RSD significantly increased Cd transport from root to shoot and the amount of Cd accumulated in the aerial part. RSD was an effective organic additive for increasing rice grain yield, but total Cd content in rice grain was also increased. At an application rate of 1.5-3.0 % RSD, the total Cd content in Weiyou 46#brown rice was 0.27-0.31 mg kg-1, which exceeded the standard safe limit (0.2 mg kg-1) and was also higher than that of Xiangwanxian 12#(0.04-0.14 mg kg-1). Therefore, Weiyou 46#had a higher dietary risk than Xiangwanxian 12#with RSD application. We do not recommend planting Weiyou 46#and applying more than 0.75 % RSD in Cd-contaminated paddy fields.
authors.affiliation: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.|College of Bioscience and Technology, Hunan Agricultural University, Changsha, 410128, China.
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Yang
authors.affiliation: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
authors.forename: Jiao-Feng
authors.initials: JF
authors.lastname: Gu
authors.affiliation: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
authors.forename: Jia-Ling
authors.initials: JL
authors.lastname: Zou
authors.affiliation: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Zhou
authors.affiliation: College of Bioscience and Technology, Hunan Agricultural University, Changsha, 410128, China. qrzeng@163.com.|College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China. qrzeng@163.com.
authors.forename: Qing-Ru
authors.initials: QR
authors.lastname: Zeng
authors.affiliation: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. liaobh1020@163.com.
authors.forename: Bo-Han
authors.initials: BH
authors.lastname: Liao
mesh_terms: D000143:Acids / Q000032:analysis; D001682:Biological Availability; D018533:Biomass; D029741:Brassica rapa / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis* / Q000378:metabolism; D002681:China; D005308:Fertilizers / Q000032:analysis*; D012275:Oryza / Q000737:chemistry / Q000254:growth & development*; D018517:Plant Roots / Q000737:chemistry / Q000254:growth & development; D018520:Plant Shoots / Q000737:chemistry / Q000254:growth & development; D012639:Seeds / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism
chemical_list: D000143:Acids; D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium
keywords: Accumulated amount; Cd pollution; Rapeseed dregs; Rice grain yield; Translocation factor