Mitigation of cadmium and arsenic in rice grain by applying different silicon fertilizers in contaminated fields.
A field experiment was established to support the hypothesis that application of different silicon (Si) fertilizers can simultaneously reduce cadmium (Cd) and arsenic (As) concentration in rice grain. The "semi-finished product of Si-potash fertilizer" treatment at the high application of 9000 kg/ha (NP+S-KSi9000) significantly reduced the As concentration in rice grain by up to 20.1%, compared with the control. Si fertilization reduces the Cd concentration in rice considerably more than the As concentration. All Si fertilizers apart from sodium metasilicate (Na2SiO3) exhibited a high ability to reduce Cd concentration in rice grain. The Si-calcium (CaSi) fertilizer is the most effective in the mitigation of Cd concentration in rice grain. The CaSi fertilizer applied at 9000 kg/ha (NPK+CaSi9000) and 900 kg/ha (NPK+CaSi900) reduced the Cd concentration in rice grain about 71.5 and 48.0%, respectively, while the Si-potash fertilizer at 900 kg/ha (NP+KSi900), the semi-finished product of Si-potash fertilizer at both 900 kg/ha (NP+S-KSi900) and 9000 kg/ha (NP+S-KSi9000), and the rice straw (NPK+RS) treatments reduced the Cd concentration in rice grain about 42, 26.5, 40.7, and 23.1%, respectively. The results of this investigation demonstrated the potential effects of Si fertilizers in reducing Cd and As concentrations in rice grain.
School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China.|State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Hong-Yan
HY
Wang
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Shi-Lin
SL
Wen
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Peng
P
Chen
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Lu
L
Zhang
School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China.
Kuang
K
Cen
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China. gxsun@rcees.ac.cn.
Guo-Xin
GX
Sun
D001151:Arsenic / Q000032:analysis* / Q000378:metabolism; D002104:Cadmium / Q000032:analysis* / Q000378:metabolism; D002523:Edible Grain / Q000737:chemistry / Q000254:growth & development*; D005308:Fertilizers / Q000032:analysis*; D012275:Oryza / Q000737:chemistry / Q000254:growth & development*; D012825:Silicon / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism
D005308:Fertilizers; D012989:Soil Pollutants; D002104:Cadmium; D001151:Arsenic; D012825:Silicon
Arsenic; Cadmium; Field experiment; Mitigation; Rice grain; Silicon fertilizer