1. Steel slag amendment impacts on soil microbial communities and activities of rice (Oryza sativa L.).
- Author
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Das S, Gwon HS, Khan MI, Jeong ST, and Kim PJ
- Subjects
- Actinobacteria classification, Actinobacteria genetics, Actinobacteria isolation & purification, Alphaproteobacteria classification, Alphaproteobacteria genetics, Alphaproteobacteria isolation & purification, Betaproteobacteria classification, Betaproteobacteria genetics, Betaproteobacteria isolation & purification, Carbon Cycle physiology, Deltaproteobacteria classification, Deltaproteobacteria genetics, Deltaproteobacteria isolation & purification, Firmicutes classification, Firmicutes genetics, Firmicutes isolation & purification, Gammaproteobacteria classification, Gammaproteobacteria genetics, Gammaproteobacteria isolation & purification, Humans, Hydrogen-Ion Concentration, Iron metabolism, Iron pharmacology, Metallurgy methods, Microbial Consortia physiology, Nitrogen Cycle physiology, Oryza microbiology, Oryza physiology, Phosphorus physiology, Photosynthesis physiology, Plant Roots drug effects, Plant Roots microbiology, Plant Roots physiology, RNA, Ribosomal, 16S genetics, Silicon metabolism, Silicon pharmacology, Soil chemistry, Soil Microbiology, Steel chemistry, Fertilizers analysis, Microbial Consortia drug effects, Oryza drug effects, Photosynthesis drug effects, Waste Products analysis
- Abstract
With the increase in iron/steel production, the higher volume of by-products (slag) generated necessitates its efficient recycling. Because the Linz-Donawitz (LD) slag is rich in silicon (Si) and other fertilizer components, we aim to evaluate the impact of the LD slag amendment on soil quality (by measuring soil physicochemical and biological properties), plant nutrient uptake, and strengthens correlations between nutrient uptake and soil bacterial communities. We used 16 S rRNA illumine sequencing to study soil bacterial community and APIZYM assay to study soil enzymes involved in C, N, and P cycling. The LD slag was applied at 2 Mg ha
-1 to Japonica and Indica rice cultivated under flooded conditions. The LD slag amendment significantly improved soil pH, plant photosynthesis, soil nutrient availability, and the crop yield, irrespective of cultivars. It significantly increased N, P, and Si uptake of rice straw. The slag amendment enhanced soil microbial biomass, soil enzyme activities and enriched certain bacterial taxa featuring copiotrophic lifestyles and having the potential role for ecosystem services provided to the benefit of the plant. The study evidenced that the short-term LD slag amendment in rice cropping systems is useful to improve soil physicochemical and biological status, and the crop yield.- Published
- 2020
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