Impacts of Steel-Slag-Based Silicate Fertilizer on Soil Acidity and Silicon Availability and Metals-Immobilization in a Paddy Soil

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 soi...

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Bibliographic Details
Published in:PloS one 2016-12, Vol.11 (12), p.e0168163
Main Authors: Ning, Dongfeng, Liang, Yongchao, Liu, Zhandong, Xiao, Junfu, Duan, Aiwang
Format: Article
Language:English
Subjects:
Acidic soils
Acidity
Agriculture
Analysis
Availability
Biology and Life Sciences
Cadmium
Cadmium - chemistry
Cadmium - metabolism
Cadmium content
Crop production
Crop rotation
Ecology and Environmental Sciences
Fertilizers
Grain
Heavy metals
Hydrogen-Ion Concentration
Immobilization
Lead
Lead - chemistry
Medicine and Health Sciences
Metals
Metals - chemistry
Metals, Heavy - chemistry
Oryza
Oryza sativa
pH effects
Physical Sciences
Plant diseases
Research and Analysis Methods
Rice
Rice fields
Shoots
Silicates
Silicates - chemistry
Silicon
Silicon - chemistry
Silicon dioxide
Silicon Dioxide - chemistry
Slag
Soil - chemistry
Soil acidity
Soil improvement
Soil pH
Soil Pollutants - analysis
Soils
Steel
Steel - chemistry
Straw
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Summary: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.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0168163