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Effects of steel slag and biochar amendments on CO₂, CH₄, and N₂O flux, and rice productivity in a subtropical Chinese paddy field
Wang, Chun (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Wang, Weiqi (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i Aplicacions Forestals)
Singla, Ankit (India. Ministry of Agriculture and Farmers Welfare. Regional Centre of Organic Farming)
Zeng, Congsheng (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Lai, Derrick Yu Fo (Chinese University of Hong Kong. Department of Geography and Resource Management)
Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals)

Date: 2018
Abstract: Steel slag, a by-product of the steel industry, contains high amounts of active iron oxide and silica which can act as an oxidizing agent in agricultural soils. Biochar is a rich source of carbon, and the combined application of biochar and steel slag is assumed to have positive impacts on soil properties as well as plant growth, which are yet to be validated scientifically. We conducted a field experiment for two rice paddies (early and late paddy) to determine the individual and combined effects of steel slag and biochar amendments on CO₂, CH₄, and N₂O emission, and rice productivity in a subtropical paddy field of China. The amendments did not significantly affect rice yield. It was observed that CO₂ was the main greenhouse gas emitted from all treatments of both paddies. Steel slag decreased the cumulative CO₂ flux in the late paddy. Biochar as well as steel slag + biochar treatment decreased the cumulative CO₂ flux in the late paddy and for the complete year (early and late paddy), while steel slag + biochar treatment also decreased the cumulative CH4 flux in the early paddy. The biochar, and steel slag + biochar amendments decreased the global warming potential (GWP). Interestingly, the cumulative annual GWP was lower for the biochar (55,422 kg CO₂-eq ha⁻¹), and steel slag + biochar (53,965 kg CO₂-eq ha⁻¹) treatments than the control (68,962 kg CO₂-eq ha⁻¹). Total GWP per unit yield was lower for the combined application of steel slag + biochar (8951 kg CO₂-eq Mg⁻¹ yield) compared to the control (12,805 kg CO₂-eq Mg⁻¹ yield). This study suggested that the combined application of steel slag and biochar could be an effective long-term strategy to reduce greenhouse gases emission from paddies without any detrimental effect on the yield.
Note: Número d'acord de subvenció EC/FP7/610028
Note: Número d'acord de subvenció MINECO/CGL2013-48074-P
Note: Número d'acord de subvenció AGAUR/2014/SGR-274
Rights: Tots els drets reservats
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Paddy ; Greenhouse gases ; Steel slag ; Biochar ; Rice productivity
Published in: Environmental geochemistry and health, Published online dec. 2018, ISSN 0269-4042

DOI: 10.1007/s10653-018-0224-7


Available from: 2020-06-30
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The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
Articles > Research articles
Articles > Published articles

 Record created 2019-01-09, last modified 2019-02-28



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