title: Impacts of Steel-Slag-Based Silicate Fertilizer on Soil Acidity and Silicon Availability and Metals-Immobilization in a Paddy Soil.
abstract: Slag-based silicate fertilizer has been widely used to improve soil silicon- availability and crop productivity. A consecutive early rice-late rice rotation experiment was conducted to test the impacts of steel slag on soil pH, silicon availability, rice growth and metals-immobilization in paddy soil. Our results show that application of slag at a rate above higher or equal to 1 600 mg plant-available SiO2 per kg soil increased soil pH, dry weight of rice straw and grain, plant-available Si concentration and Si concentration in rice shoots compared with the control treatment. No significant accumulation of total cadmium (Cd) and lead (Pb) was noted in soil; rather, the exchangeable fraction of Cd significantly decreased. The cadmium concentrations in rice grains decreased significantly compared with the control treatment. In conclusion, application of steel slag reduced soil acidity, increased plant-availability of silicon, promoted rice growth and inhibited Cd transport to rice grain in the soil-plant system.
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, China.
authors.forename: Dongfeng
authors.initials: D
authors.lastname: Ning
authors.affiliation: Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China.
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, China.
authors.forename: Zhandong
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, China.
authors.forename: Junfu
authors.initials: J
authors.lastname: Xiao
authors.affiliation: Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, China.
authors.forename: Aiwang
authors.initials: A
authors.lastname: Duan
mesh_terms: D002104:Cadmium / Q000737:chemistry / Q000378:metabolism; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry; D012275:Oryza; D017640:Silicates / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013232:Steel / Q000737:chemistry*
chemical_list: D005308:Fertilizers; D008670:Metals; D019216:Metals, Heavy; D017640:Silicates; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D013232:Steel; D007854:Lead; D012822:Silicon Dioxide; D012825:Silicon