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INDUSTRIAL AND AGRICULTURAL WASTES DECREASED GREENHOUSE-GAS EMISSIONS AND INCREASED RICE GRAIN YIELD IN A SUBTROPICAL PADDY FIELD

Published online by Cambridge University Press:  13 July 2017

WEIQI WANG ,
CONGSHENG ZENG ,
JORDI SARDANS ,
DONGPING ZENG ,
CHUN WANG ,
MIREIA BARTRONS  and
JOSEP PEÑUELAS
WEIQI WANG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou, 350007, China
CONGSHENG ZENG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou, 350007, China
JORDI SARDANS*
Affiliation:
CSIC, Global Ecology Unit CREAF- SCIC-UAB, Bellaterra, Catalonia, Barcelona, 08193, Spain CREAF, Cerdanyola del Vallés, Catalonia, Barcelona, 08193, Spain
DONGPING ZENG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou, 350007, China
CHUN WANG
Affiliation:
Institute of Geography, Fujian Normal University, Fuzhou, 350007, China
MIREIA BARTRONS
Affiliation:
Aquatic Ecology Group, BETA Tecnio Centre, University of Vic – Central University of Catalonia, Catalonia, Vic, Spain
JOSEP PEÑUELAS
Affiliation:
CSIC, Global Ecology Unit CREAF- SCIC-UAB, Bellaterra, Catalonia, Barcelona, 08193, Spain CREAF, Cerdanyola del Vallés, Catalonia, Barcelona, 08193, Spain
*
Corresponding author. Email: j.sardans@creaf.uab.cat
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Summary

Reducing the emissions of greenhouse gases (GHG) from paddy fields is crucial both for the sustainability of rice production and mitigation of global climatic warming. The effects of applying industrial and agricultural wastes as fertilizer on the reduction of GHG emissions in cropland areas, however, remain poorly known. We studied the effects of the application of 8 Mg ha−1 of diverse wastes on GHG emission and rice yield in a subtropical paddy in southeastern China. Plots fertilized with steel slag, biochar, shell slag, gypsum slag and silicate and calcium fertilizer had lower total global-warming potentials (GWP, including CO2, CH4 and N2O emissions) per unit area than control plots without waste application despite non-significant differences among these treatments. Structural equation models showed that the effects of these fertilization treatments on gas emissions were partially due to their effects on soil variables, such as soil water content or soil salinity. Steel slag, biochar and shell slag increased rice yield by 7.1%, 15.5% and 6.5%, respectively. The biochar amendment had a 40% lower GWP by Mg−1 yield production, relative to the control. These results thus encourage further studies of the suitability of the use waste materials as fertilizers in other different types of paddy field as a way to mitigate GHG emissions and increase crop yield.

Type
Research Article
Information
Experimental Agriculture , Volume 54 , Issue 4 , August 2018 , pp. 623 - 640
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Copyright
Copyright © Cambridge University Press 2017 

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